Behaviors and motivations for weight loss in children and adolescents

Weight loss trends in Korean adolescents (2005-2021): Exploring the impact of measured and self-perceived weight status

OBJECTIVE

This study aims to assess the trends in the proportions of weight loss efforts among Korean adolescents aged 10-18 years from 2005 to 2021, examining variations based on weight status, to examine factors related to weight loss efforts by weight status, and to evaluate weight loss efforts based on the combination of measured and self-perceived weight status.

METHODS

Complex sample design analyses were conducted on a dataset comprising 10,760 adolescents, utilizing information from the Korea National Health and Nutrition Examination Survey, a nationally representative dataset. Participants were categorized into non-overweight and overweight groups using a BMI percentile threshold of 85.

RESULTS

22-29 % of non-overweight adolescents and 54-77 % of adolescents with overweight engaged in weight loss efforts. Among adolescents who attempted to lose weight from 2005 to 2017, 39.5-57.1 % tried both of diet and exercise, 22.7-47.4 % tried exercise alone, and 10.2-26.7 % tried diet alone. Female gender, older age, and higher self-perceived weight status were associated with increased odds of weight loss efforts, irrespective of actual weight status. For adolescents perceiving themselves as obese, the odds of attempting weight loss were 8.32 for non-overweight boys, 2.02 for non-overweight girls, 15.28 for overweight boys, and 5.77 for overweight girls compared to controls who were non-overweight and perceived themselves as not obese.

CONCLUSION

Weight loss efforts among Korean adolescents aged 10 to 18 remained consistent irrespective of their actual weight over 16 years. Throughout this period, adolescents who perceived themselves as obese were more likely to attempt weight loss, independent of their true weight status. Hence, subjective weight perception plays a significant role in influencing weight loss behaviors among adolescents.

What adolescents see on Instagram: Content analysis of #intermittentfasting, #keto, and #lowcarb

AIM

To describe popular diet content visible on #intermittentfasting, #keto, and #lowcarb on adolescent social media accounts.

METHODS

An adolescent Instagram profile captured 200 'top' images from three popular diet hashtags (#intermittentfasting, #keto, and #lowcarb) across two timepoints. Images were coded using a pre-determined ontology as food (core or discretionary; common foods/food groups), people (group, individual, before/after), or informative. Descriptive statistics were used to summarise these categories across hashtags.

RESULTS

At the time of first data collection, there were 3.8 million #intermittentfasting, 19 million #keto, and 22 million #lowcarb posts on Instagram. At the second timepoint there were 4.3 million #intermittentfasting, 21.5 million #keto, and 24.3 million #lowcarb posts. Images tagged #intermittentfasting were categorised as 44% food, 39% people, 10% information; #keto were 64% food, 28% people, 5% information; and #lowcarb were 69% food, 14% people, 16% information. Food images mostly depicted animal proteins (58.6% of #intermittentfasting; 62.9% of #keto; and 40.1% of #lowcarb). Images of people were individual (44%) or before/after (39%); mostly female (77%), of white (53%) ethnicity. Across all posts, 12.5% were linked to a commercial product/program, and 2.3% provided nutrition information.

CONCLUSION

Diet-related images visible when adolescents search #intermittentfasting, #keto, and #lowcarb on Instagram promote animal-based foods with or without vegetables. These diet hashtags on Instagram do not provide nutrition information and are not helpful for young people searching for diet information online.

Youth's energy intake during a laboratory-based loss-of-control eating paradigm: Associations with reported current dieting

Dieting is theorized as a risk factor for loss-of-control (LOC)-eating (i.e., feeling a sense of lack of control while eating). Support for this association has largely relied on retrospective self-report data, which does not always correlate with objectively assessed eating behavior in youth. We hypothesized that during a laboratory-based LOC-eating paradigm, children and adolescents who reported current (at the time of the visit) dieting would consume meals consistent with LOC-eating (greater caloric intake, and intake of carbohydrates and fats, but less intake of protein). Participants were presented with a buffet-style meal and instructed to "Let yourself go and eat as much as you want." Current dieting (i.e., any deliberate change to the amount or type of food eaten to influence shape or weight, regardless of how effective the changes are) was assessed via interview. General linear models were adjusted for fat mass (%), lean mass (kg), height, sex, protocol, race and ethnicity, pre-meal hunger and minutes since consumption of a breakfast shake. Of 337 participants (Mage 12.8 ± 2.7y; 62.3 % female; 45.7 % non- Hispanic White and 26.1 % non-Hispanic Black; MBMIz 0.78 ± 1.11), only 33 (9.8 %) reported current dieting. Current dieting was not significantly associated with total energy intake (F = 1.63, p = .20, ηp2 = 0.005), or intake from carbohydrates (F = 2.45, p = .12, ηp2 = 0.007), fat (F = 2.65, p = .10, ηp2 = 0.008), or protein (F = 0.39, p = .53, ηp2 = 0.001). Contrary to theories that dieting promotes LOC-eating, current dieting was not associated with youth's eating behavior in a laboratory setting. Experimental approaches for investigating dieting are needed to test theories that implicate dieting in pediatric LOC-eating.

Improving Children's Lifestyle and Quality of Life through Synchronous Online Education: The Nutritional Adventures School-Based Program

The early introduction of effective nutritional educational programs is pivotal for instilling sustainable healthy behaviors. The present work aims to present a best practice example of a nutrition and overall lifestyle school-based training program, the Nutritional Adventures ("Diatrofoperipeteies"). Conducted during 2020-2022 in Greek primary schools, this synchronous, online educational initiative included two 1-school-hour activities with a nutrition instructor. Additionally, schools were randomly assigned to supplementary "at-home" supported-by-parents or "in-class" supported-by-educators educational activities. In total, n = 12,451 students of 84 primary schools participated. Parent-completed questionnaires were selected in the recruitment and post-intervention phase (40% participation rate); overall, the working sample was n = 1487 students. In the post-intervention phase, a significant increase in Mediterranean diet adherence was observed (KIDMED score: mean increment = 0.25 units; p < 0.001), particularly fruit and vegetable consumption. Time spent on physical activity increased, while screen time decreased. Students' total quality of life significantly improved (PedsQL; mean increment = 1.35 units; p < 0.001), including on all of its subscales (physical, emotional, social, and school function). Supplementary educational activities that were supported by educators rather than parents yielded a more favorable impact on students' lifestyle and quality of life. The Nutritional Adventures program can be regarded as a successful initiative in primary schools, yielding immediate advantages that extend beyond promoting healthy dietary habits.

A Canadian longitudinal study of the associations between weight control status and lifestyle behaviors during adolescence

This study aimed to estimate associations between weight control status (trying to lose, gain or maintain weight) and lifestyle behaviors (moderate-to-vigorous physical activity (MVPA), screen time, and the consumption of breakfast, fast food, fruits and vegetables, and sugar-sweetened beverages (SSB)) in adolescents. Data from 919 adolescents in the MATCH study, in New Brunswick, Canada, who self-reported their weight control status at least once within 24 data collection cycles over 8 years (from 2011 to 2019) and from 812 who provided data at least once over the 7 cycles on eating behaviors were used. Generalized estimating equations were used. At the first cycle, mean age was 11.3 (SD = 1.2) years old and 56% were girls. Trying to gain (β = 0.47, CI = [0.15, 0.79]) and maintain weight (β = 0.35, CI = [0.12, 0.57]) were positively associated with MVPA. Trying to lose weight was negatively associated with breakfast (IRR = 0.90, CI = [0.85, 0.94]) and positively associated with screen time (β = 0.62, CI = [0.15, 1.10]), fruit and vegetable (IRR = 1.12, CI = [1.01, 1.25]) and SSB (IRR = 1.42, CI = [1.10, 1.84]). Changes from one weight control status to trying to lose weight were associated with increases in fast food consumption (β = 0.49, CI = [0.15, 0.84]). Weight control status was associated with healthy and unhealthy behaviors in adolescents. Trying to gain or maintain weight was generally associated with more favorable health-related behaviors. Education on healthy weight management behaviors is needed to improve adolescents' health.

Relationships examined: Parent and child readiness to change and sociodemographic characteristics in family based weight loss treatment

BACKGROUND

Family based treatment is an effective, multipronged approach to address obesity as it plagues families.

OBJECTIVE

To investigate the relationships among sociodemographic characteristics (e.g., education and income), body mass index (BMI) and race/ethnicity with readiness to change for parents enrolled in the Primary care pediatrics, Learning, Activity and Nutrition (PLAN) study.

METHODS

Multivariate linear regressions tested two hypotheses: (1) White parents will have higher levels of baseline readiness to change, when compared to Black parents; (2) parents with higher income and education will have higher levels of readiness to change at baseline.

RESULTS

A positive relationship exists between baseline parent BMI and readiness to change (Pearson correlation, 0.09, p < 0.05); statistically significant relationships exist between parent education level (-0.14, p < 0.05), income (0.04, p < 0.05) and readiness to change. Additionally, a statistically significant relationship exists, with both White (β, -0.10, p < 0.05), and Other, non-Hispanic (-0.10, p < 0.05) parents exhibiting lower readiness to change than Black, non-Hispanic parents. Child data did not indicate significant relationships between race/ethnicity and readiness to change.

CONCLUSIONS

Results demonstrate that investigators should consider sociodemographic characteristic factors and different levels of readiness to change in participants enrolling in obesity interventions.

Examining the effect of parent participation in an adult weight management program on changes in children's weight

Children of parents participating in weight management programs (WMPs) are more likely to adopt their parents' weight control practices. Little is known about the weight outcomes of children who have a parent participating in a WMP. This study aimed to assess this relationship. Children 2-17 years of age with a parent who participated in a WMP were included in the study. Multilevel linear mixed-effects regression models were used, stratified by child weight status at the time of parental WMP participation (healthy weight, overweight/obesity) to determine change in children's BMIz from before to after parents WMP participation, including covariates of parent BMI and parental feeding practices. Parents (N = 77) were mostly white (76%) and female (84%). Children (N = 114) had a mean age of 10.5 ± 4.6; 47% had overweight or obesity. Children with overweight or obesity prior to their parent's WMP had a decrease in BMIz (-0.68) after the WMP while children with a healthy weight had no significant change. Children with overweight or obesity had a decrease in BMIz from before to after parent's participation in a WMP. Further research is needed to understand changes in family eating practices that occur during and after parent WMP participation.

Food and Mood: Daily Associations Between Missed Meals and Affect Among Early Adolescents

OBJECTIVE

Youth frequently miss meals and experience hunger, yet no studies have assessed how these experiences relate to changes in daily emotional states. This daily diary study examined associations of missing breakfast, missing lunch, and hunger with daily positive and negative affect among young adolescents.

METHODS

A community sample of 133 grade 5 and 6 students (50.4% boys, Mage = 10.77, 19.5% BIPOC) from two public schools completed baseline socio-demographic measures at the beginning of the study and daily measures at the end of the school day over 5 consecutive days. Measures included positive and negative affect, breakfast, lunch, and hunger. Multilevel regression models were constructed to test the associations.

RESULTS

Among participating youth, 27.8% missed breakfast at least once, 15.0% missed lunch at least once, and 26.3% felt hungry at least once. Missing breakfast was associated with increased negative affect (B = 0.36, p = .030) and missing lunch was related to both increased negative affect (B = 0.52, p = .019) and decreased positive affect (B = -0.80, p = .002). Hunger was not related to daily affect.

CONCLUSION

This study provides a unique view of youths' experiences of missing meals, hunger, and daily emotional states. The findings underscore the importance of youth being adequately nourished through school meal programs. Clinicians should screen for and address missing meals among their young patients.

Weight-Based Victimization and Physical Activity Among Adolescents With Overweight or Obesity: A Scoping Review of Quantitative and Qualitative Evidence

Background

Increased physical activity engagement plays a vital role in preventing and treating overweight or obesity in children and adolescents. Research has found that adolescents who are overweight or obese tend to participate in less physical activity than adolescents of average weight. Weight-based victimization (victimization related to weight or body size) is highly prevalent in adolescence and seems to be a factor that might negatively impact engagement in physical activity. This scoping review's objective was to identify the nature and extent of research evidence on links between weight-based victimization and physical activity among community-based or primary health care samples of adolescents who are overweight or obese.

Methods

Following established scoping review methods, we searched electronic databases PubMed, Web of science, SportDiscuss, and Cinahl from 23 Nov 2020 to 02 Dec 2020. Published studies with community-based or primary health care samples of adolescents who were overweight or obese (aged 13–18 years, Iso-BMI ≥ 25, i.e., age and gender specific percentiles based on specified cut-off value for overweight and obesity) and that were peer-reviewed and published were included in the analysis. Data from the included studies were put into a table and analyzed descriptively and numerically in terms of the extent and nature of the studies.

Results

After full text review, 12 articles were included, equally distributed in the qualitative and quantitative paradigm. There was a homogeneity of the research designs applied. Articles revealed high frequency of weight-based victimization. Among quantitative studies the reported links between weight-based victimization and physical activity were somewhat mixed, with three studies reporting weight-based victimization to negatively impact physical activity, while three studies report no significant impact. Qualitative studies reported experiences of teasing and bullying by peers, humiliation, and feelings of insecurity about appearance as barriers to engagement in physical activity.

Conclusion

The empirical evidence on the links between weight-based victimization and physical activity among community-based or primary-health care samples of adolescents who are overweight or obese is sparse. The results revealed a high presence of weight-based victimization in physical activity which seems to act as barriers for activity engagement. There is a need for more research to advance the understanding of the links between weight-based victimization and physical activity among community-based or primary-health care samples of adolescents who are overweight or obese.

Association between Physical Activity, Sedentary Behaviors, Sleep, Diet, and Adiposity among Children and Adolescents in China

INTRODUCTION

Physical activity (PA), sedentary behaviors (SB), sleep, and diet are related to adiposity among children and adolescents. However, there may be interactions between PA, SB, sleep, and diet, and these lifestyle behaviors may work together to affect body weight. The purpose of this study was to explore the impact of multiple lifestyle behaviors of PA, SB, sleep, and diet on childhood adiposity (body mass index z-score and overweight/obesity), and to investigate the effect of meeting multiple guidelines on adiposity among children and adolescents in China.

METHODS

Cross-sectional results were based on 28,048 children aged 6-17 years from the China National Nutrition and Health Surveillance in 2010-2012. Information about PA, SB, and sleep was measured through interview-administered questionnaire. Dietary intake was assessed with food frequency questionnaire. The associations between multiple lifestyle behaviors and BMI z-score and overweight/obese were examined.

RESULTS

The prevalence of overweight/obesity in the participants was 19.2%. The average time of moderate-to-vigorous PA (MVPA), leisure SB, and sleep was 76.7 ± 45.5 min, 2.9 ± 1.4 h, and 8.5 ± 1.1 h per day, respectively. The China Dietary Guidelines Index for Youth (CDGI-Y) score was 62.6 ± 11.0. Sleep duration and diet score were negative associated with BMI z-score (both p < 0.001). MVPA and SB time were positive associated with BMI z-score (p = 0.041, 0.004). Meeting the SB, sleep, and diet guidelines had a lower BMI z-score (all p < 0.01) and lower odds of overweight/obesity (all p < 0.05). There were significant interactions between PA and diet. Compared with meeting no guidelines, those who met multiple guidelines had a lower risk of overweight/obesity (all p < 0.01). The more guidelines the participants met, the lower odds of overweight/obesity (p for trend <0.001).

CONCLUSIONS

PA, SB, sleep, and diet are important behaviors associated with adiposity among children and adolescents. Attaining adequate amounts of appropriate multiple behaviors provided an additional benefit. It is important for children to meet recommended behavioral guidelines or recommendations. Interventions that aim to improve awareness of and compliance with these guidelines are needed in future.

24-hour movement behaviour profiles and their transition in children aged 5.5 and 8 years - findings from a prospective cohort study

BACKGROUND

Time spent in movement behaviours, including physical activity (PA), sedentary behaviour (SB) and sleep, across the 24-h day may have distinct health consequences. We aimed to describe 24-h movement behaviour (24 h-MB) profiles in children and how profile membership changed from age 5.5 to 8 years.

METHODS

Children in the Growing Up in Singapore Towards healthy Outcomes (GUSTO) cohort were asked to wear an accelerometer (ActiGraph-GT3X+) on their wrist for seven consecutive days at ages 5.5 and 8 years to measure 24 h-MB patterns. Time spent in night sleep, inactivity (proxy for SB), light PA, moderate PA (MPA), and vigorous PA (VPA) per day were calculated using the R-package GGIR 2.0. Using latent profile analyses (n = 442) we identified 24 h-MB profiles, which were given animal names to convey key characteristics. Latent transition analyses were used to describe the profile membership transition from ages 5.5 to 8 years. Associations with sex and ethnicity were examined.

RESULTS

We identified four profiles, "Rabbits" (very high-MPA/VPA, low-inactivity and average-night-sleep), "Chimpanzees" (high-MPA, low-inactivity and average-night-sleep), "Pandas" (low-PA, high-inactivity and high-night-sleep) and "Owls" (low-PA, high-inactivity and low-night-sleep), among children at both time points. At ages 5.5 and 8 years, the majority of children were classified into profiles of "Chimpanzees" (51 and 39%, respectively) and "Pandas" (24 and 37%). Half of the sample (49%), particularly "Rabbits", remained in the same profile at ages 5.5 and 8 years: among children who changed profile the predominant transitions occurred from "Chimpanzees" (27%) and "Owls" (56%) profiles to "Pandas". Sex, but not ethnicity, was associated with profile membership: compared to girls, boys were more likely to be in the "Rabbits" profile (adjusted OR [95% CI]: 3.6 [1.4, 9.7] and 4.5 [1.8, 10.9] at ages 5.5 and 8 years, respectively) and less likely to be in the "Pandas" profile (0.5 [0.3, 0.9] and 0.4 [0.2, 0.6]) at both ages.

CONCLUSIONS

With increasing age about half the children stayed in the same of four 24 h-MB profiles, while the predominant transition for the remaining children was towards lower PA, higher inactivity and longer sleep duration. These findings can aid development and implementation of public health strategies to promote better health.

STUDY REGISTRATION

This study was registered on 4th August 2010 and is available online at ClinicalTrials.gov: NCT01174875 .

Intention to lose weight and use of electronic cigarettes among adolescents

Electronic cigarette use among American adolescents is a major public health concern given the negative health consequences of nicotine in youth. Recent literature has shown that weight control may be one motivation for use in this population. This study examined associations between intention to lose weight and e-cigarette use among adolescents having overweight or obesity from an ethnically diverse sample of Texas youth by gender. We performed a cross-sectional analysis of a state representative sample of 9056 eighth and eleventh grade students from the 2015-2016 Texas School Physical Activity and Nutrition (Texas SPAN) study. Validated survey items assessed weight intentions and e-cigarette use. Staff collected anthropometric measures. Logistic regression analysis was conducted to assess the relationship between e-cigarette use and weight intentions with gender interaction, adjusting for grade, race/ethnicity, economic status, weight-behaviors and stratified by BMI class. More than half (50.9%) of the weighted sample were Hispanic and 12.5% were Non-Hispanic Black; 8.5% used e-cigarettes; and 50.0% intended to lose weight. Of the 40.2% of the sample having overweight or obesity, 82.9% intended to lose weight. Among respondents with obesity, use of e-cigarettes was significantly higher among males intending to lose weight than among females intending to lose weight (12% versus 6%, p = 0.007). These findings contrast with previous research suggesting that e-cigarette use in females is more likely to be motivated by an intent to lose weight. The ethnic diversity of the Texas SPAN population may explain this discrepancy.

Contextualising Eating Disorder Concerns for Paediatric Obesity Treatment

PURPOSE OF REVIEW

Eating disorders are complex mental health conditions that share risk factors with obesity. This review outlines the context for concerns that paediatric obesity treatment presents a risk for eating disorder development.

RECENT FINDINGS

Most children and adolescents undergoing professionally supervised obesity treatment will have improvements or no change to eating disorder risk profiles. However, some may subsequently develop a clinical eating disorder, and this is proposed to relate to weight-focussed dietary interventions that are standard in paediatric obesity treatment. Nevertheless, dietary restraint may not be a strong predictor of eating disorder risk in the context of paediatric obesity treatment. Most international guidelines recommend weight maintenance or weight loss as a treatment goal, and weight loss is related to improvements in cardiometabolic health but not eating disorder risk in the short term. The risk of inducing or exacerbating an eating disorder during paediatric weight management is likely to be low; however, the serious consequences combined with increasing scale of obesity treatment, and lack of empirical evidence, are of concern. There is a need for further research to identify long-term predictors of eating disorder development for children and adolescents who seek treatment for their obesity.

Addressing psychosocial health in the treatment and care of adolescents with obesity

Obesity affects 158 million youth worldwide and is associated with psychosocial comorbidity. This review describes weight management options utilized by adolescents, including both self-directed weight loss and medically supervised obesity treatment interventions, and associated psychosocial impacts. A majority of adolescents with obesity attempt to manage weight on their own, primarily through attempting weight loss, sometimes with supplement use. Approaches such as these are associated with a degree of risk, disordered eating behaviors, and further weight gain. In contrast, medically supervised multicomponent interventions are associated with improved psychosocial health, including quality of life, self-esteem, and body image, and reduced symptoms of depression, anxiety, and eating disorders. Few studies utilizing antiobesity pharmacotherapy have reported psychosocial outcomes, and trials of bariatric surgery show some early improvements with a need for sustained psychological support following surgery. Greater access to medically supervised treatment services is required to facilitate obesity care for adolescents. Early data on psychosocial health and obesity treatment offer promising outcomes; however, larger randomized controlled trials and longer-term data are needed. Future research should include both physiological and psychosocial outcomes to assess impact of interventions on the holistic health of adolescents with obesity.

Food addiction and mental health in adolescents: a systematic review

The intersection between eating behaviours and mental health has garnered substantial attention in recent years. For this Review, we systematically reviewed the available research to find out the prevalence of food addiction as measured by the Yale Food Addiction Scale, and to investigate its association with mental health-related outcomes in adolescents. Eight databases were searched using keywords from Jan 1, 2009, to Aug 5, 2020, to identify studies reporting a Yale Food Addiction Scale diagnosis or symptom score, or both. In total, 27 studies were included. The prevalence of a food addiction diagnosis ranged from 2·6% to 49·9% in non-clinical and clinical populations, and prevalence was higher in women and adolescents with a higher weight status. Food addiction was associated with disordered eating, depressive and anxiety symptoms, and a poorer quality of life and self-esteem. These associations have important implications for the assessment and management of eating behaviours and mental health in adolescents. Transdiagnostic prevention and management intervention strategies could be explored.

Aversion to Off-label Prescribing in Clinical Pediatric Weight Management: The Quintessential Double Standard

CONTEXT

Pediatric obesity is now recognized as a chronic disease; yet few treatment options exist besides lifestyle modification therapy and bariatric surgery. We describe the limited availability of United States Food and Drug Administration (FDA)-approved antiobesity medications for adolescents and compare this to what is available for adults. We offer a rationale for off-label prescribing to assist with lifestyle modification therapy. We also highlight the need for more pharmacotherapy options and additional research into novel treatments for pediatric obesity.

CASE DESCRIPTION

We describe a patient who is struggling with managing her weight and starting to develop complications of obesity. We offer a framework in which off-label prescribing may be beneficial to patients who have been engaging in lifestyle modification therapy yet fail to see improvement.

CONCLUSION

Lifestyle modification therapy is necessary but often insufficient in stimulating clinically meaningful weight loss when used alone in children and adolescents who struggle with weight management. Until more FDA-approved antiobesity medications are available, pediatricians may be able to help more patients achieve weight reduction goals by familiarizing themselves with the responsible use of off-label medications and implementing these tools to improve clinical outcomes. There is a critical need for more pharmacotherapy options to help pediatric patients in managing their weight and preventing or improving the insidious complications resulting from untreated obesity.

Adolescent Exposure to Weight Loss Imagery on Instagram: A Content Analysis of "Top" Images

Background: Social media is a source of weight loss information for adolescents. However, engagement with image-based social media has been associated with reduced body image. This study describes weight loss imagery visible on an adolescent Instagram account. Methods: The "top" 600 images were captured from "#weightloss" on an adolescent (16 years, gender not specified) Instagram account in August 2020. Images were categorized and coded based on a predetermined ontology as food (nutrient-dense, energy-dense), people (group, individual, before/after), or text-focused by one coder (20% in duplicate, 90% agreement). Images of people were coded for sex and ethnicity and images of individuals coded for adiposity, muscularity, and pose. Results: Of 600 images, 208 (34.7%) were of individuals, predominantly females (83%) with white (37%), non-white (23%), or unclear (41%) ethnicity. Body types were thin (31%), average (43%), or higher weight (6%) with little-to-none (25%), visible (26%), or high (7%) muscularity. Almost half of images accentuated body features with a fitness/muscle accentuating (21%) or sexualized (21%) pose or both (3%). From 165 (27.5%) food images, 71% were nutrient-dense and 29% energy-dense. Of 107 (17.8%) before/after images, 90% depicted weight loss, 4% muscle building with 85% in females. From 93 (15.5%) text-focused images, 46% related to weight loss programs/products and few provided nutrition (n = 12, 13%) or exercise (n = 2, 2%) information. Conclusions: Most "#weightloss" imagery visible to adolescents on Instagram were of people, frequently females, with almost half of body-focused poses or before/after weight loss images. Few provide nutrition and exercise-related content.

Examination of Weight-Loss Motivators and Family Factors in Relation to Weight Management Strategies and Dietary Behaviors among Adolescents with Obesity

The study aim was to test hypotheses informed by self-determination theory (SDT) regarding associations of adolescent motivators for weight loss and family feeding practices on understanding adolescent weight management and dietary behaviors. Adolescents (n = 71) with obesity were recruited from a large medical center in the Midwest USA and completed questionnaire assessments via an online survey. Results supported hypotheses that endorsement of health motivators for weight loss, conceptualized as autonomous (intrinsic) motivation, and positive family support would be associated with healthier weight management practices and dietary behaviors. Nuanced findings related to social- and self-esteem-related motivators for weight loss indicated a need for further understanding of these weight-loss motivators in the context of SDT. The current study findings highlight the importance of addressing motivational factors and family influences in research and practice related to promoting healthy dietary habits and weight management strategies among adolescents with obesity.

Child Health Behaviour and Parent Priorities for a School-Based Healthy Lifestyle Programme

OBJECTIVE

The purpose of this study was to characterise parents' concerns for their children's health behaviours and perceptions of motivators and barriers to positive child health behaviour change, and to determine associations between motivators and barriers and parents' priorities for a school-based healthy lifestyle programme.

DESIGN

Cross-sectional study of 46 parents who had completed an un-validated survey distributed during school-wide events.

SETTING

School for children aged 5-14 years in The Bronx, New York City, USA.

METHODS

Wilcoxon Rank Sum tests compared motivators and barriers to positive child health behaviour change by heath behaviour concern; Spearman's correlation measured associations between motivators and barriers and programme priorities.

RESULTS

Parents concerned about child weight significantly ranked keeping up with others and decreasing clothing size as motivators, while parents concerned about child food choices significantly ranked improving food choices and decreasing BMI and clothing size as motivators. Food-, play-, and self-esteem-related motivators were associated with nutrition education (r_s ≥ .41, p ≤ .01), physical activity classes (r_s ≥ .29, p ≤ .04) and child involvement in programme decision-making (r_s ≥ .43, p ≤ .01) priorities. Consistency-, child resistance-, and home rules-related barriers were associated with nutrition education (r_s ≥ .37, p=.02), physical activity classes (r_s ≥ .32, p = .02), and child involvement (r_s ≥ .40, p ≤ .02) priorities.

CONCLUSIONS

Despite the study sample size, selection bias, and generalisability limitations, prioritising nutrition, physical activity and child involvement in programme decision-making may enhance parent support for school-based healthy lifestyle programmes.

Body Weight Perception and Health-Related Behaviors Among U.S. Adolescents: Mediating Effects of Body Weight Control Behaviors

This study examined mediating effects of body weight control behaviors in the relationship between body weight perception and health-related behaviors among 11,458 U.S. adolescents from the 2010 National Youth Physical Activity and Nutrition Survey. Parallel multiple mediation analysis was performed for the secondary data analysis. Nearly one third of adolescents (32.5%) had overweight or obesity; one quarter (25.0%) perceived themselves as slightly overweight and 5.1% thought they were very overweight. More girls (58.6%) had tried to lose weight than boys (32.3%), while boys were more physically active than girls. Healthy and unhealthy weight control behaviors significantly mediated the relationship between adolescents' body weight perception and health-related behaviors (physical activity and screen time). Teachers and parents should help adolescents have accurate weight perception and utilize reliable and healthy weight control strategies. Future studies should consider the intercorrelated relationships among adolescents' perceptions and behaviors regarding weight to provide successful weight control intervention programs.

Role of Sex on the Relationship Between Sexual Minority Status and Misperceptions of Body Weight Among High School Students

PURPOSE

Misperception of body weight during adolescence is a risk factor for negative self-image, harmful eating/dietary habits (e.g., binge eating and purging), and body dysmorphia. Sexual minority youth, particularly males, may be at increased risk for misperceptions of body weight, relative to youth who do not identify as a sexual minority. This study examines the risk for misperception of body weight among sexual minority youth and explores biological sex as an effect modifier in this relationship.

METHODS

We pooled data from the 2015 and 2017 Youth Risk Behavior Surveillance Surveys. Participants were 18,634 high school students who were not overweight/obese. Multivariable logistic regression examined the association between sexual minority status (i.e., gay, lesbian, bisexual, and unsure) and misperceptions of body weight (i.e., self-perceived as overweight/severely overweight). Weighted multivariable logistic regression analyses, stratified by biological sex, were used to compare this relationship across males and females. Covariates included race/ethnicity, grade, bullying victimization, television/electronic screen time, and tobacco use.

RESULTS

Overall, 16.6% of the sample self-reported misperceptions of body weight. Sexual minority youth had 1.49 (95% confidence interval [CI]: 1.28-1.73) greater odds of misperception of body weight, adjusting for covariates; this relationship was found across biological sex, but that the main effect was significantly greater among sexual minority males (adjusted odds ratio: 2.24, 95% CI: 1.65-3.03) relative to sexual minority females (adjusted odds ratio: 1.33, 95% CI: 1.11-1.59).

CONCLUSIONS

Sexual minority youth had greater odds of overestimating their weight status. Biological sex appears to modify this relationship with sexual minority males being at particularly high risk for overestimating their weight status.

Food insecurity is associated with increased weight loss attempts in children and adolescents

Household food insecurity (HFI) has been associated with adverse childhood outcomes and shares many common risk factors with obesity. Half of adolescents with overweight or obesity are actively attempting to lose weight. We aim to evaluate whether HFI is associated with weight loss attempts and unhealthy weight loss control practices in children. We examined cross-sectional data of children ages 8 to 15 years old from the National Health and Nutrition Examination Survey. Attempted weight loss was more common among children with very low food security (OR 1.50, 95% CI 1.09, 2.07). Children with a healthy weight with very low food security had increased odds of attempting weight loss (OR 1.51, 95% CI 1.00, 2.26) but there was no association in children with overweight or obesity. Very low food security was also associated with unhealthy weight control practices (OR: 1.42, 95% CI: 1.04, 1.93). Physicians should counsel all children and adolescents on healthy and unhealthy weight loss behaviours, regardless of weight or food security status.

Weight Stigma in Youth: Prevalence, Consequences, and Considerations for Clinical Practice

PURPOSE OF REVIEW

This review summarizes recent evidence on weight stigma experienced by youth with overweight or obesity. We examine the prevalence and sources of weight-based victimization targeting youth, consequences of these stigmatizing experiences for their psychological and physical health, and considerations for addressing weight stigma in clinical practice and pediatric care.

RECENT FINDINGS

Weight stigma is highly prevalent among youth with high body weight, who are targets of weight-based victimization from peers, parents, and teachers. These experiences place youth at risk for psychological distress (primarily depressive symptoms, low self-esteem, and suicidal ideation), worse social and academic outcomes, and adverse physical health consequences including maladaptive eating behaviors, lower physical activity, substance use, and weight gain. Healthcare professionals and clinicians have important roles to play in efforts to help reduce weight stigma and support youth with obesity. Fundamental to these efforts is the use of supportive, compassionate, and non-stigmatizing communication with youth and their families.

Development and content validity of an instrument for assessing the motivation for weight loss in adolescents with overweight and obesity

Objective

To develop and validate the content of an instrument for assessing the motivation for weight loss in adolescents with overweight and obesity.

Methods

The development and validation of the instrument were conducted in five stages, for which two systematic reviews were conducted. The first one, for the identification of questionnaires assessing the motivation for weight loss, included six studies and contributed to the selection of the domains for the instrument. The second one, conducted to identify the motivations for weight loss in adolescents with overweight and/or obesity, included six studies and contributed to the selection of 17 motivations included in the initial version of the instrument. The motivations most commonly identified were: having better health, improving my appearance, improving my self-esteem and avoiding bullying. The content validity was confirmed by a committee of 12 experts from the areas of nutrition, endocrinology, psychology, and physical education. Based on these evaluations, the content validity index was calculated. Only the items with a content validity index >0.80 for practical relevance were held in the instrument.

Results

Five of the 17 motivations included in the initial version of the instrument were excluded because they had content validity index <0.80 for practical relevance. Of the 12 items held in the instrument, five were revised by experts in order to standardize wording and make the language more appropriate for adolescents. Experts categorized the items into the health, personal satisfaction, appearance and social domains.

Conclusions

This is the first instrument assessing the motivation for weight loss in adolescents with overweight and obesity in Brazil. The content validity evaluation by the panel of experts provided more practical relevance, as well as contributed to a better presentation of the items. Further psychometric testing is needed to determine reliability and construct validity of the instrument.

Energy intake and expenditure in children and adolescents, contributions of biological maturity

OBJECTIVE

The aim of this study was to examine the relationship between the ratio of energy intake (EI) and energy expenditure (EE) and body composition, physical activity and macronutrients intake, considering maturity as a moderator.

METHODS

The study involved 459 adolescents aged 10 to 17. Energy and macronutrients intake were estimated using a valid Food Frequency Questionnaire; basal metabolic rate (BMR) was predicted from Schofield equations and EE was estimated using BMR and physical activity level obtained through a Portuguese validated biosocial questionnaire. Body mass index, body composition, and bone age were objectively measured. Statistical analyses included independent samples t-tests, ANCOVA and Pearson correlations. All analyses were adjusted for chronological age, sex, and EI.

RESULTS

Body mass index, fat and fat-free mass, physical activity and protein intake were negatively correlated with EI/EE (P < .001). The study showed significant interactions between maturity and body mass index, fat-free mass and physical activity level. Maturity attenuated the negative relationships between EI/EE and body mass index, fat-free mass and physical activity, especially among early maturers. All categories of maturity showed implications in body mass index for values lower than 23.8 kg/m² . A significant EI/EE reduction was observed among late maturers with a fat-free mass above 39.8 kg.

CONCLUSIONS

Our findings suggest that maturity moderates the relationship between EI/EE and body mass index, fat-free mass and physical activity, especially evident among late maturers.

The prevalence of weight-control behaviors and associated factors among adolescent girls in Tehran

Objectives Weight control behavior is a strategy for weight loss or weight gains that range from healthy to unhealthy. This study is aimed to determine the prevalence of weight control behaviors and their related factors in adolescent girls in Tehran. Methods Adolescent girls in the last grade of high school (n=491) that were selected by a multi-stage sampling method completed a cross-sectional survey (2018) in Tehran city in Iran. Data were collected using questionnaires (standard and researcher-made) by the self-report method and analyzed using descriptive and inferential statistics, including Chi-square, independent t-test, and logistic regression. Results 17.5% of adolescents had healthy, 60.6% had unhealthy, 15.8% had extreme unhealthy weight control behaviors, and 6.1% had no weight control behaviors. 74.8% of adolescents were in the normal body mass index (BMI) percentile. Unhealthy weight control behaviors were observed more than healthy behaviors at all BMI levels. Weight control behaviors had significant relationships with weight control intention (p=0.005), family (p=0.016) and peers (p=0.011) encouragement to weight control, engagement of relatives in weight control behaviors (p=0.016), anxiety (p<0.001), and age (p=0.030). BMI has a positive correlation with body weight satisfaction (p<0.001) and body weight perception (p<0.001). The results of logistic regression showed that increasing anxiety score can increase the possibility of engaging in unhealthy weight control behaviors (odd ratio=1.086, p=0.006). Conclusions Considering that a significant percentage of adolescents have unhealthy and extreme unhealthy weight control behaviors, and some of these behaviors leave irreversible effects on the health of this age group, design, and implementation of educational programs to prevent such behaviors seem imperative.

Factors Associated with Tendency for Weight Loss in a Representative Sample of Children and Adolescents: The CASPIAN-V Study

Background:

This study aims to determine the factors affecting the tendency to lose weight (TLW) and its methods in Iranian children and adolescents.

Methods:

In this cross-sectional nationwide study 14800 students, aged 7–18 years, living in 30 provinces of Iran were selected via multistage cluster random sampling method. The dietary and physical activity habits and TLW as well as psychosocial health status, anxiety, self-satisfaction, and change in dietary behaviors were assessed by the global school-based student health survey (WHO-GSHS) questionnaire. Multivariate logistic regression model was used to identify factors influencing TLW.

Results:

Overall, 14274 students (participation rate of 99%), consisting of 51% boys and 71.4% urban residents, completed the study. Of them, 37.7% (51.4% Girls and 48.6% boys) tended to lose weight. In multivariate model, the odds for TLW was 12% higher in students aged 13–18 years than those aged 6–12 years (OR = 1.12, 95% CI: 1.02 to 1.23; P < 0.001). Students with high anxiety level were 43% more likely to have TLW (OR = 1.43, 95% CI: 1.28–1.59; P < 0.001). The odds of increasing physical activity for weight loss was 22% lower in obese than in normal weight students (OR = 0.78, 95% CI: 0.66 to 0.93; P < 0.001).

Conclusions:

TLW was significantly higher in girls, as well as in those with higher anxiety level. In addition to dietary change, increasing physical activity should be encouraged among children and adolescents with excess weight. Public education regarding proper lifestyle change for reaching healthy weight should be underscored.

Patients' reasons for weight loss and their relations to clinical weight loss outcomes in a comprehensive lifestyle intervention

OBJECTIVE

Research suggests that individuals seeking weight loss treatment do so for a variety of reasons. Limited work has explored relations of reasons for weight loss to patient characteristics or to weight loss outcomes. The current study examined these relations.

METHODS

The sample consisted of 588 patients in a 15-week fee-for-service weight loss programme. Prior to the intervention, patients completed questionnaires including items on reasons for weight loss, demographic characteristics, and a variety of weight-based characteristics. Patients' weight change outcomes were expressed as percent weight loss and also categorized into one of three previously described weight loss trajectories.

RESULTS

The results of chi-squared and t-test analyses suggested that endorsement of health concerns, mobility concerns, or another person's recommendation was associated with higher body mass index (BMI) and older age. These reasons were more likely to be endorsed by White patients than Black patients and by male patients than female patients. Endorsement of doctor recommendation was more likely to be seen among Black patients than White patients. There was no significant relation of any weight loss reason with weight loss outcome.

CONCLUSIONS

While certain reasons for weight loss were more often cited by certain patient groups, no specific reason predicted a better or worse outcome.

Weight Control Practices in Children of Parents Participating in Weight Management Programs

Background: Family members influence the behaviors and weight loss of adults in weight management programs (WMPs). Less is known about the weight control practices of children who have a parent participating in a WMP. Thus, we aimed to explore weight control practices in children of parents in WMPs. Methods: We recruited participants who were parents of least one child aged 2-18 living at home from two institution's adult WMPs. Parents reported weight control practices for themselves and their child. We used separate logistic regression models to assess the association of each child weight control practice with parent weight control practice; child age, race, sex, and BMI z-score (BMIz); parent education; and household income. Results: Parents (N = 300) had a mean age of 41 ± 7 and 85% were female. Children (N = 295) had a mean age of 9.3 ± 4.9; 20% had overweight or obesity. Parents reported their child used the following weight control practices in the past year: 12% dieted, 12% ate very little food, 7% used food substitutes, 10% skipped meals, 29% increased fruit and vegetables, 25% reduced calories, 22% reduced snacking, 21% reduced fat intake, and 45% exercised. Children were more likely to utilize weight control practices if their parent utilized the same weight control practice and if children had obesity and were older. Conclusions: Children of parents attending WMPs commonly utilize weight control practices, especially older children with higher BMIz. Adult WMPs should offer guidance to parents on ways to incorporate new healthy dietary practices into their family.

Do sex differences in reported weight loss intentions and behaviours persist across demographic characteristics and weight status in youth? A systematic review

Background

Evidence suggests that young females are more likely to try to lose weight than young males, however whether this sex difference persists across demographic characteristics and weight status is unclear. Further, whether females are more likely than males to try to lose weight using unhealthy weight loss strategies has never been systematically assessed. The objective of this systematic review was to examine the literature on sex differences in weight loss intentions and strategies in children and adolescent observational studies to determine whether sex differences persisted across demographic characteristics (race/ethnicity, grade level) and weight status.

Methods

Relevant articles published after 1990 were identified using PubMED, Web of Science, and PsycInfo. Searches were conducted in May of 2015 and again in May of 2017. Studies conducted in the US and Canada with participants 18-years old or younger who measured weight loss strategies in the context of weight loss intention were selected. Descriptive statistics were extracted from 19 studies.

Results

Almost two-thirds of youth reported trying to lose weight. High-school and middle-school aged females reported consistently higher prevalence of weight loss intentions compared to male counterparts, as did Caucasian, African-American, and Hispanic females. The proportion of youth using unhealthy or extreme strategies reached 44 and 13%, respectively, with a similar proportion of males and females endorsing the use of each category of weight loss strategies across studies. Native-American youth reported the highest prevalence (27%) of using extreme strategies.

Conclusions

Researchers should consider demographic characteristics when reporting prevalence information for weight loss intentions and behaviours, as certain groups might require more targeted public health initiatives. Across characteristics, prevalence ranges were broad for weight loss intentions and use of particular strategies, suggesting the need to standardize and refine data collection and reporting practices in this literature.

Electronic supplementary material

The online version of this article (10.1186/s12889-018-6179-x) contains supplementary material, which is available to authorized users.

Motivations for weight loss in adolescents with overweight and obesity: a systematic review

BACKGROUND

Adolescents with overweight and obesity report various motivations for weight loss other than the desire for better health. However, there is little evidence regarding the main motivations for weight loss in adolescents. The present systematic review aimed to identify the motivations for weight loss in adolescents with overweight and obesity.

METHODS

A systematic search for original articles published up to December 2016 was carried out in the PubMed, Scopus, LILACS, and ADOLEC databases. The terms used in the search were: motivation, motive, reason, "weight loss," "lose weight," and adolescent.

RESULTS

Six studies (all cross-sectional) met the selection criteria and were included in the review. The instruments used to assess the participants' motivations for weight loss were interviews and questionnaires with open questions. Seventeen motivations for weight loss were identified, the main ones being better health, esthetic/cosmetic reasons, improvements in self-esteem, and avoidance of provocation/bullying.

CONCLUSIONS

The results of the present review show the need for validated instruments to assess the motivations for weight loss in adolescents with overweight and obesity. Moreover, the high frequency of motivations for weight loss related to appearance and social acceptance evidences the need for multidisciplinary weight loss interventions that consider not only the biological factors, but also the psychological and social aspects.

Мотиви за свързани с външния вид поведения при млади мъже с различен статус на телесното тегло: Качествено изследване

Изследването проучва мотивите за свързаните с външния вид поведения при млади мъже във възникваща зрелост (18-29 г.) с различен статус на телесното тегло. Проведени са 15 дълбинни полу-структурирани интервюта с мъже и 15 с жени, анализирани чрез тематичен анализ и интерпретативен феноменологичен анализ. Седем от петнадесетте млади мъже са с наднормено тегло или затлъстяване, като този статус на телесното тегло оказва значимо влияние върху съдържанието на мотивите за свързаните с външния вид поведения. Идентифицирани са девет мотива: да бъдеш с нормално тегло (по-слаб или по-едър, в зависимост от актуалния статус на телесното тегло); да не ти се подиграват другите; да имаш красиво/мускулесто тяло (стегнато, спортно тяло, или добре развито, мускулесто тяло); за здраве; за да се чувстваш добре; за висока самооценка; за да те харесват момичетата; за да можеш да победиш във физически сблъсък (включва да бъдеш физически силен и да предизвикваш уважение/респект у другите мъже); за (професионално) развитие в спорта. Първите пет мотива са свързани с поведенията на хранене (специален хранителен режим/диета) и с поведенията на физическа активност (спорт, физически упражнения, фитнес), а мотивът да имаш красиво/мускулесто тяло – и с прекомерни физически тренировки, прием на хранителни добавки и анаболни стероиди. Останалите мотиви са свързани с поведенията спорт, фитнес, прекомерни физически тренировки, прием на хранителни добавки и анаболни стероиди. Първите два мотива се отнасят до лицата със свръхтегло, третият – почти изцяло до мъжете с нормално тегло. Мотивите за здраве и да се чувстваш добре са сред най-универсалните (значими при всички статуси на телесното тегло). Последните 4 мотива могат да бъдат отнесени най-вече към нормалното тегло и добре развитата мускулатура.

Obesity Prevention and Treatment in Primary Care

Despite extensive public health and clinical interventions, obesity rates remain high, and evidence-based preventive strategies are elusive. Many consensus guidelines suggest that providers should screen all children after age 2 years for obesity by measuring height and weight, calculating body mass index (BMI), and sensitively communicating weight status in the context of health to the family at each visit. However, preventive counseling should begin in infancy and focus on healthy feeding, activity, and family lifestyle behaviors. For children with overweight or obesity, the American Academy of Pediatrics outlines 4 stages of treatment: 1) Primary care providers should offer "prevention plus," the use of motivational interviewing to achieve healthy lifestyle modifications in family behaviors or environments; 2) children requiring the next level of obesity treatment, structured weight management, need additional support beyond the primary care provider (such as a dietitian, physical therapist, or mental health counselor) and more structured goal setting with the team, including providers adept at weight management counseling; 3) children with severe obesity and motivated families may benefit from referral to a comprehensive multidisciplinary intervention, such as an obesity treatment clinic; and 4) tertiary care interventions are provided in a multidisciplinary pediatric obesity treatment clinic with standard clinical protocols for evaluation of interventions, including medications and surgery. Although it is certainly a challenge for providers to fit in all the desired prevention and treatment counseling during preventive health visits, by beginning to provide anticipatory guidance at birth, providers can respond to parents' questions, add to parents' knowledge base, and partner with parents and children and adolescents to help them grow up healthy. This is especially important in an increasingly toxic food environment with numerous incentives and messages to eat unhealthfully, barriers to appropriate physical activity, and concomitant stigma about obesity. Focusing on key nutrition and physical activity habits and establishing these healthy behaviors at an early age will allow children to develop a healthy growth trajectory. However, much more work is needed to determine the best evidence-based practices for providers to counsel families on improving target behaviors, environmental modifications, and parenting skills and to decrease abundant disparities in obesity prevalence and treatment.

Attempts to Lose Weight Among US Children: Importance of Weight Perceptions from Self, Parents, and Health Professionals

OBJECTIVE

The objective of this study was to investigate how perceptions of weight by children themselves, parents, and health professionals influence children's persistent attempts to lose weight.

METHODS

The sample included 4,914 children aged 8 to 15 years from the 2005 to 2014 National Health and Nutrition Examination Survey (representing 20.7 million children). Data were analyzed using logistic regression models.

RESULTS

About 34.2% never made an effort to lose weight, whereas 28.2% made persistent attempts to lose weight. Children's persistent attempts to lose weight were highly related to their own BMI percentile. Children's self-perceptions of overweight increased the odds of persistent attempts to lose weight more than sevenfold. Health professionals' perceptions that children were overweight increased the odds of persistent attempts to lose weight almost threefold. However, parents' perceptions of children as overweight had a relatively small though significant influence on children's attempts to lose weight.

CONCLUSIONS

As perceptions of children's weight status play big roles in children's attempts to lose weight, interventions focusing on increasing accuracy of perceptions may help promote healthy weight loss efforts. Although parents are key agents in controlling their children's weight gain, especially among minority school-aged children, the study findings also emphasize the greater importance of health professionals on children's attempts to lose weight across different racial/ethnic groups.

Pilot Study Measuring the Novel Satiety Hormone, Pro-Uroguanylin, in Adolescents With and Without Obesity

OBJECTIVE

Disruption of satiety signaling may lead to increased caloric intake and obesity. Uroguanylin, the intestinal hormone, travels as a precursor to the central nervous system where it activates guanylyl cyclase C and stimulates pro-satiety neurons. Rodent studies have demonstrated that guanylyl cyclase C-knockout mice overeat and have increased weight gain versus wild-type mice and hyper-caloric obesity diminishes uroguanylin expression. We measured circulating plasma pro-uroguanylin, along with other gastrointestinal peptides and inflammatory markers, in human adolescents with and without obesity, as a pilot study. We hypothesized that adolescents with obesity would have less circulating pro-uroguanylin than adolescents without obesity have.

METHODS

We recruited 24 adolescents (age 14-17 years) with and without obesity (body mass index >95% or body mass index <95%) and measured plasma pro-uroguanylin at fasting and successive time points after a meal. We measured 3 other satiety hormones and 2 inflammatory markers to characterize overall satiety signaling and highlight any link between uroguanylin and inflammation.

RESULTS

Female adolescents with obesity had lower circulating pro-uroguanylin levels than female adolescents without obesity; we observed no difference in males. Other measured gastrointestinal peptides varied in their differences between cohorts. Inflammatory markers were higher in female participants with obesity.

CONCLUSIONS

In adolescents with and without obesity, we can measure circulating pro-uroguanylin levels. In female adolescents without obesity, levels are particularly higher. Pro-uroguanylin secretion patterns differ from other circulating gastrointestinal peptides. In female adolescents with obesity, inflammation correlates with decreased pro-uroguanylin levels.

Parental and Self-Weight Perceptions in U.S. Children and Adolescents, NHANES 2005-2014

This study aimed to describe the parental and child self-weight perceptions and their associated sociodemographic factors. The 2005-2014 National Health and Nutrition Examination Survey (NHANES) sample of 16,869 children aged 2 to 17 years was used. For overweight/obese children aged 2 to 15 years, 61.2% of parents underestimated their child’s weight. For overweight/obese children aged 8 to 17 years, 55.2% underestimated their own weight. For children aged 8 to 15 years, 77.8% parents and children agreed on the weight classification. Parents of boys and those with low income were more likely to underestimate their child’s weight. Girls, older children, and those living in larger or high-income families were less likely to underestimate their own weight. Hispanic and Black children tended to underestimate their weight. With increasing child age, parents and children were more likely to disagree on the child’s weight. Future efforts should focus on low-income families with larger number of children and Hispanic and Black young children who were more likely to underestimate their weight.

Physical activity and family-based obesity treatment: a review of expert recommendations on physical activity in youth

Targeting physical inactivity in children is pertinent to aiding in the decrease of childhood obesity rates. Only 33% of adolescents are obtaining the recommended goal of at least 60 min of physical activity per day. The objectives of this review are to summarize professional recommendations for physical activity and exercise in children and adolescents, and identify family-centred strategies that can be implemented by weight management clinicians. Clinically oriented recommendations and policy statements from professional organizations were identified through literature and internet searches, summarized using rubrics of aerobic, muscle strengthening and bone strengthening exercise, then examined for details on family-based focus, inclusion of child developmental stage and age, and application to the prevention and treatment of obesity. Current recommendations give guidelines for the amount of physical activity that children should acquire and how many days a week activities should occur. However, available guidelines need an improved approach to addressing the role of the parents and caregivers in targeting physical activity and weight management in youth. Efforts must be taken in order to make sure that the types of physical activity offered are both suitable and enjoyable. Sports, games, free play and other age appropriate activities are adequate ways to increase moderate to vigorous physical activity in children. Differentiating physical activities types in accordance with developmental stage, level of enjoyment, and family characteristics is needed to establish sustainable habits. One paediatric obesity program has developed approaches to teaching families fun and engaging ways to be active together.

Immunohistochemical Staining for Uroguanylin, a Satiety Hormone, is Decreased in Intestinal Tissue Specimens From Female Adolescents With Obesity

Gastrointestinal tract-secreted satiety hormones play a significant role in one of the largest health-care challenges for children and adults, obesity. Recent studies in mice identified a novel role for uroguanylin, the endogenous intestinal hormone that binds guanylyl cyclase C (GUCY2C), in regulating satiety via a gut-brain signaling pathway. Mice bred without GUCY2C receptors over-ate and developed obesity. We hypothesized that intestinal uroguanylin expression in pediatric patients with obesity would be lower than patients without obesity, and we attempted to examine the difference with immunohistochemistry. Retrospective chart review of gastrointestinal endoscopic procedures at an academic children's hospital identified patients with normal pathology findings on biopsy. Children aged 8-17 were included in the review; we analyzed biopsy samples from 20 matched pairs that differed only by body mass index (BMI)-for-age (average: 25%-75% vs. high: >95%). Biopsies of the duodenum, terminal ileum, ascending colon, and descending colon were subjected to immunohistochemistry for GUCY2C, uroguanylin, and the endogenous colonic hormone, guanylin. Intensity staining of all specimens was scored by a blinded pathologist. The overall staining intensity for females with high BMI-for-age was less for uroguanylin and guanylin as compared to average BMI-for-age females while GUCY2C staining was equal. Males did not exhibit different staining intensities for uroguanylin or guanylin. More matched female pairs had greater uroguanylin and guanylin staining in the average BMI-for-age cohort. The intestinal expression of uroguanylin, a key satiety hormone, appears to be diminished in female pediatric patients in the setting of obesity.

Relationship between early menarche, obesity, and disordered eating behaviors: a school-based cross-sectional survey in Northern Saudi Arabia

BACKGROUND

Obesity and disordered eating (DE) behaviors are serious health concerns, regularly observed among female adolescents, which could progress to adverse psychological and nutritional sequels.

AIM

The aim of this study was to determine the prevalence of obesity and the self-reported DE behaviors among high school female students and to evaluate their self-perception of body image, peer pressures, and need for dietary consultation.

METHODS

This is a school-based cross-sectional study conducted in 2018. Self-administered surveys and anthropometric measurements were obtained from adolescent females, randomly selected from eight schools in northern Saudi Arabia. Sample characteristics were age, menarche, and DE behaviors (binge eating, self-induced vomiting, and usage of laxatives). Body mass index was converted to percentiles using the age-to-gender scale. Self-perception of body image, perceived peer pressures, and the Eating Attitude Test-26 (EAT-26) were scored, summated, and then presented in percentage mean scores (PMSs) and mean scores (MSs).

RESULTS

Sample comprised 399 participants. One hundred twenty-eight (32.1%) participants reported early age of menarche (≤12 years). Sixty-five (16.3%) participants reported the prevalence of overweight/obesity, 123 (30.8%) participants reported binge eating, 28 (7.0%) participants reported self-induced vomiting, and 21 (5.3%) participants reported usage of laxatives. The PMS of self-perception of body weight and peer pressure was 68.7±27.1 and 41.9±23.5, respectively. One hundred ninety-two (48.1%) participants needed professional dietary help. Students with early age of menarche were 1.7 times more likely to be overweight/obese (adjusted [adj] P=0.018) compared to others. Overweight/obese participants had significantly poorer self-perception of body image (PMS =47.4±25.0) and higher perceived peer pressure (PMS =49.5±23.1) compared to underweight/normal weight students (PMS =72.8±25.6 [P<0.001] and PMS =40.5±23.3 [P=0.005], respectively). Participants with early age of menarche complained of higher perceived peer pressure compared to others (P=0.045). Participants with DE behaviors had higher peer pressure (PMS =46.8±23.5) and higher scores on E-26 (MS =22.2±11.4) compared to their counter groups (P=0.002 and 0.016, respectively).

CONCLUSION

The high rate of overweight/obesity and DE behaviors among female adolescents is alarming. Special consideration should be made for those with early menarche who were more prone to overweight/obesity.

Subjective evaluation of psychosocial well-being in children and youths with overweight or obesity: the impact of multidisciplinary obesity treatment

PURPOSE

To investigate the effects of a multidisciplinary childhood obesity treatment programme on subjective evaluations of psychosocial well-being and quality of life.

METHODS

This longitudinal observational study included 1291 children, adolescents and young adults, 6-22 years of age, with overweight or obesity. At entry and after 2-82 months of obesity treatment, the patients evaluated the following domains of psychosocial well-being on a visual analogue scale: quality of life, mood, appetite, bullying, motivation for weight loss and body image satisfaction. The degree of overweight was calculated using a body mass index (BMI) standard deviation score (SDS) at each visit.

RESULTS

At entry, the mean BMI SDS was 2.81 (range: 1.35-6.65, 95% confidence interval (95% CI): 2.44-3.18). After a median of 14 months of treatment, the median reduction in BMI SDS was 0.29 (95% CI: 0.26-0.31, p < 0.0001). Improvements were observed in the domains of quality of life, mood, appetite, bullying and body image satisfaction (p < 0.0001). Larger reductions in BMI SDS were associated with greater improvements in the domains of quality of life (p = 0.001), mood (p = 0.04) and body image satisfaction (p < 0.0001), independent of BMI SDS at entry. However, improvements in psychosocial well-being were also observed in those increasing their BMI SDS (n = 315).

CONCLUSIONS

In a large group of children and youths, psychosocial well-being improved during a multidisciplinary childhood obesity treatment programme, irrespective of the degree of obesity at treatment entry. Greater reductions in BMI SDS were associated with greater improvements in psychosocial well-being, but even in the group increasing their BMI SDS improvements were observed.

Does psychological functioning mediate the relationship between bullying involvement and weight loss preoccupation in adolescents? A two-stage cross-sectional study

Background

Adolescent bullying is associated with a range of adversities for those who are bullied i.e., victims and bully-victims (e.g., those who bully others and get victimised), including reduced psychological functioning and eating disorder symptoms. Bullies are generally well-adjusted psychologically, but previous research suggests that bullies may also engage in problematic diet behaviours. This study investigates a) whether adolescents involved in bullying (bullies, victims, bully-victims) are at increased risk of weight loss preoccupation, b) whether psychological functioning mediates this relationship and c) whether sex is a key moderator.

Method

A two-stage design was used. In stage 1, adolescents (n = 2782) from five UK secondary schools were screened for bullying involvement using self and peer reports. In stage 2, a sample of bullies, victims, bully-victims and uninvolved adolescents (n = 767) completed a battery of assessments. The measures included the eating behaviours component of the Child and Adolescent Psychiatric Assessment, which was reduced to one factor (weight loss preoccupation) and used as the outcome variable. Measures of self-esteem, body-esteem and emotional problems were reduced to a latent (mediator) variable of psychological functioning. Multi-group analysis examined the effects of sex and all models were adjusted for covariates (BMI, pubertal stage, age, parental education and ethnicity).

Results

Bullies, victims and bully-victims were at increased risk of weight loss preoccupation compared to adolescents uninvolved in bullying. The mechanism by which bullying involvement related to increased weight loss preoccupation varied by bullying role: in bullies the effect was direct, in victims the effect was indirect (via reduced psychological functioning) and in bully-victims the effect was both direct and indirect. Sex significantly moderated the relationship in bullies: weight loss preoccupation was only statistically significant in bullies who were boys.

Conclusion

Bullying involvement during adolescence is associated with weight loss preoccupation. Bullies are likely driven by a desire to increase attractiveness and social status; whereas weight loss preoccupation in bullied adolescents may have maladaptive influences on diet and exercise behaviours due to its association with reduced psychological functioning. Future research should consider peer victimisation as a potential modifiable risk factor for reduced psychological functioning and weight loss preoccupation, which if targeted, may help to prevent maladaptive diet and exercise behaviours.

Electronic supplementary material

The online version of this article (doi:10.1186/s12966-017-0491-1) contains supplementary material, which is available to authorized users.

Parental and offspring factors in offspring's weight-loss efforts

PURPOSE

Although weight-loss efforts in non-overweight adolescents and young adults are quite common, the relation between parental and offspring factors related to this behavior remains unclear. This study assessed the parental and offspring factors related to offspring's weight-loss efforts according to offspring's weight status.

METHODS

Data pertaining to weight-loss efforts and weight status for 1026 families, including 1449 offspring (703 male and 749 female offspring, aged 10-25 years) and 1026 pairs of parents, were derived from the Korea National Health and Nutrition Examination Survey from 2010 to 2013. A generalized estimating equation was used to examine factors associated with offspring's weight-loss efforts after adjusting for intra-familial correlations.

RESULTS

Weight-loss efforts in adolescents and young adults increased with offspring factors, such as female sex [OR (95 % CI), 2.64 (2.02-3.46)], overweight status [9.54 (6.66-13.67)], weight overestimation [2.96 (2.08-4.20)], and maternal weight-loss efforts [1.37 (1.05-1.79)], while weight-loss efforts decreased with offspring's weight underestimation [0.27 (0.19-0.37)], after adjusting for similar parental factors and intra-familial correlations. In non-overweight adolescents and young adults, weight-loss efforts were associated with maternal weight-loss efforts [1.52 (1.11-2.08)] and offspring sex [female vs. male; 2.93 (2.14-4.01)], as well as offspring's weight underestimation [vs. accurate estimation; 0.15 (0.08-0.28)] or overestimation [vs. accurate estimation; 3.05 (2.13-4.38)]. In overweight adolescents and young adults, weight-loss efforts were associated with offspring's weight underestimation [0.45 (0.28-0.71)].

CONCLUSIONS

Weight-loss efforts in adolescents and young adult offspring are associated with maternal weight-loss efforts, offspring's weight perception, and sex in non-overweight offspring, and offspring's weight perception in overweight offspring.