Relationships between the family environment and school-based obesity prevention efforts: can school programs help adolescents who are most in need?

Effects of school-based "We Fit" weight control programme in adolescents

Aim

This study examined the effects of a 12‐week school‐based “We Fit” weight control programme.

Design

A nonequivalent control group was used, with a non‐synchronized pretest–posttest design.

Methods

In total, 109 Korean high school adolescents participated. The programme comprised exergaming, diet diary and counselling, health education, and social networking service‐based group discussions. Anthropometric factors, physiological factors and physical activity (daily steps and sitting time) were measured in the intervention and the control groups before and after the intervention. Programme satisfaction was assessed post‐intervention. Data were analysed using descriptive statistics; the chi‐square, Mann–Whitney U and t tests; and generalized estimating equations.

Results

The intervention group showed a significantly decreased waist circumference, increased skeletal muscle mass, increased high‐density lipoprotein cholesterol, decreased low‐density lipoprotein cholesterol and reduced weekend sitting time.

Conclusion

This study adds to the evidence for the applicability and effectiveness of healthy weight control programmes using exergames for adolescents in school settings.

The Influence of Peers on Diet and Exercise Among Adolescents: A Systematic Review

Adolescents' diet and exercise are modifiable factors contributing to high rates of adolescent obesity. Diverse contextual factors, including family, social environment, and peers, affect adolescents' diet and exercise behaviors. Because peer influence increases during adolescence, peers' contributions to adolescents' diet and exercise behaviors should be examined as potential targets for intervention to reduce the prevalence of adolescent obesity. The purpose of this systematic review is to identify research examining the contribution of peers to diet and exercise of adolescents. The electronic databases PubMed, CINAHL, Web of Science, and SCOPUS were searched. A total of 24 unique articles were included: seven examined diet only, fourteen studied exercise only, and three explored diet and exercise. This review provided evidence that diet and exercise of adolescents were significantly associated with those of their peers. However, these associations differed depending on gender, the type of diet and exercise, and closeness of friends. Findings from this review suggest that peers could be possible targets for interventions to promote healthier diet and exercise among adolescents; however, more studies are needed to identify specific peer influences and develop tailored interventions.

Effects of school meals based on the New Nordic Diet on intake of signature foods: a randomised controlled trial. The OPUS School Meal Study

A New Nordic Diet (NND) was developed in the context of the Danish OPUS Study (Optimal well-being, development and health for Danish children through a healthy New Nordic Diet). Health, gastronomic potential, sustainability and Nordic identity were crucial principles of the NND. The aim of the present study was to investigate the effects of serving NND school meals compared with the usual packed lunches on the dietary intake of NND signature foods. For two 3-month periods, 834 Danish children aged 8-11 years received NND school meals or their usual packed lunches brought from home (control) in random order. The entire diet was recorded over 7 consecutive days using a validated Web-based Dietary Assessment Software for Children. The NND resulted in higher intakes during the entire week (% increase) of root vegetables (116 (95 % CI 1·93, 2·42)), cabbage (26 (95 % CI 1·08, 1·47)), legumes (22 (95 % CI 1·06, 1·40)), herbs (175 (95 % CI 2·36, 3·20)), fresh berries (48 (95 % CI 1·13, 1·94)), nuts and seeds (18 (95 % CI 1·02, 1·38)), lean fish and fish products (47 (95 % CI 1·31, 1·66)), fat fish and fish products (18 (95 % CI 1·02, 1·37)) and potatoes (129 (95 % CI 2·05, 2·56)). Furthermore, there was a decrease in the number of children with zero intakes when their habitual packed lunches were replaced by NND school meals. In conclusion, this study showed that the children increased their intake of NND signature foods, and, furthermore, there was a decrease in the number of children with zero intakes of NND signature foods when their habitual packed lunches were replaced by school meals following the NND principles.

A national school-based health lifestyles interventions among Chinese children and adolescents against obesity: rationale, design and methodology of a randomized controlled trial in China

BACKGROUND

The prevalence of obesity among children and adolescents has been rapidly rising in Mainland China in recent decades, both in urban and rural areas. There is an urgent need to develop effective interventions to prevent childhood obesity. Limited rigid data regarding children and adolescent overweight prevention in China are available. A national random controlled school-based obesity intervention program was developed in the mainland of China.

METHODS/DESIGN

The study was designed as a national multi-centered cluster randomized controlled trial involving more than 70,000 children and adolescents aged 7-18 years from 7 provinces in China. In each center, about 12-16 primary and secondary schools, with totally at least 10000 participants were randomly selected (Primary: Secondary = 1:1). All of the selected schools were randomly allocated to either intervention or control group (Intervention: Control = 1:1).The multi-components school-based and family-involved scheme was conducted within the intervention group for 9 month, while students in the control group followed their usual health practice. The intervention consisted of four components: a) Create supportive school and family environment, b) Health lifestyles education and related compulsory physical activities, c) Instruct and promote school physical education, d) Self-monitor obesity related behaviors. Four types of outcomes including anthropometric, behavioral, blood chemical and physical fitness were measured to assess the effectiveness of the intervention program.

DISCUSSION

This is the first and largest multi-centered school-based obesity intervention program with the consideration of geographical and social-demographic characteristics of the rapidly increased obesity prevalence of Chinese children and adolescent. The intervention is based on Social Cognitive Theory and Social-Ecological Model of Health, and follows a stepwise approach guided by PRECEDE-PROCEED (P-P) Model and Intervention Map. The results of and lesson learned from this study will help guide future school-based national childhood obesity prevention programs in Mainland China.

TRIAL REGISTRATION

January 22, 2015;

REGISTRATION NUMBER

NCT02343588.

Motivational interviewing with parents for obesity: an RCT

BACKGROUND AND OBJECTIVE

Motivational interviewing (MI) has been shown to be an effective strategy for targeting obesity in adolescents, and parental involvement is associated with increased effectiveness. The aim of this study was to evaluate and compare the role of parental involvement in MI interventions for obese adolescents.

METHODS

A total of 357 Iranian adolescents (aged 14-18 years) were randomized to receive an MI intervention or an MI intervention with parental involvement (MI + PI) or assessments only (passive control). Data regarding anthropometric, biochemical, psychosocial, and behavioral measures were collected at baseline and 12 months later. A series of intention-to-treat, 2-way repeated-measures analysis of covariance were performed to examine group differences in change in outcomes measures over the 12-month follow-up period.

RESULTS

Results revealed significant effects on most of the outcome parameters for MI + PI (eg, mean ± SD BMI z score: 2.58 ± 0.61) compared with the passive control group (2.76 ± 0.70; post hoc test, P = .02), as well as an additional superiority of MI + PI compared with MI only (2.81 ± 0.76; post hoc test, P = .05). This pattern was also shown for most of the anthropometric, biochemical, psychometric, and behavioral outcome variables.

CONCLUSIONS

MI with parental involvement is an effective strategy in changing obesity-related outcomes and has additional effects beyond MI with adolescents only. These findings might be important when administering MI interventions in school settings.

Predictors of caregiver feeding practices differentiating persistently obese from persistently non-overweight adolescents

Understanding the contribution of caregiver feeding practices to adolescent diet and weight is important to refining caregiver roles within the context of adolescent obesity prevention and treatment. This secondary data analysis examined whether feeding practices of female caregivers differentiated persistently non-overweight (n = 29) from persistently obese (n = 47) adolescents. Families who previously participated in a cross-sectional study on correlates of obesity were recruited for this follow-up study. At the time of the follow-up study, anthropometric measures were taken for all female caregivers and adolescents, and caregivers completed the Child Feeding Questionnaire-Adolescent version. Socioeconomic, demographic, female caregiver anthropometric, and psychological (caregiver perceived self-weight and concern for adolescent overweight) variables were examined as predictors of feeding practices found to differentiate the two groups. Female caregivers of persistently obese adolescents reported significantly greater use of restriction and monitoring compared to female caregivers of persistently non-overweight adolescents. Restriction was predicted by female caregiver age and concern for adolescent overweight whereas monitoring was predicted by concern for adolescent overweight only. Caregiver feeding strategies may be an important target for adolescent obesity prevention and intervention efforts particularly among those with heightened concern about their teen's weight status.

Dietary effects of introducing school meals based on the New Nordic Diet - a randomised controlled trial in Danish children. The OPUS School Meal Study

The OPUS (Optimal well-being, development and health for Danish children through a healthy New Nordic Diet (NND)) School Meal Study investigated the effects on the intake of foods and nutrients of introducing school meals based on the principles of the NND covering lunch and all snacks during the school day in a cluster-randomised cross-over design. For two 3-month periods, 834 Danish children aged 8-11 years from forty-six school classes at nine schools received NND school meals or their usual packed lunches brought from home (control) in random order. The whole diet of the children was recorded over seven consecutive days using a validated Web-based Dietary Assessment Software for Children. The NND resulted in higher intakes of potatoes (130 %, 95 % CI 2·07, 2·58), fish (48 %, 95 % CI 1·33, 1·65), cheese (25 %, 95 % CI 1·15, 1·36), vegetables (16 %, 95 % CI 1·10, 1·21), eggs (10 %, 95 % CI 1·01, 1·19) and beverages (6 %, 95 % CI 1·02, 1·09), and lower intakes of bread (13 %, 95 % CI 0·84, 0·89) and fats (6 %, 95 % CI 0·90, 0·98) were found among the children during the NND period than in the control period (all, P< 0·05). No difference was found in mean energy intake (P= 0·4), but on average children reported 0·9 % less energy intake from fat and 0·9 % higher energy intake from protein during the NND period than in the control period. For micronutrient intakes, the largest differences were found for vitamin D (42 %, 95 % CI 1·32, 1·53) and iodine (11 %, 95 % CI 1·08, 1·15) due to the higher fish intake. In conclusion, the present study showed that the overall dietary intake at the food and nutrient levels was improved among children aged 8-11 years when their habitual packed lunches were replaced by school meals following the principles of the NND.

School-based obesity prevention programs: a meta-analysis of randomized controlled trials

OBJECTIVE

Attempts have been made to reduce childhood obesity through school-based programs. Systematic reviews of studies until 2006 reported a lack of consistency about effectiveness of such programs. Presented is an updated systematic review and meta-analysis.

DESIGN AND METHODS

Replication of methodology used in previous comprehensive systematic review and meta-analysis of randomized controlled trials of school-based obesity prevention programs covering studies until 2006 to review studies thru January 2012.

RESULTS

Based on 32 studies (n = 52,109), programs were mildly effective in reducing BMI relative to controls not receiving intervention. Studies of children had significant intervention effects, those of teenagers did not, though the difference between the two groups was not statistically significant. Meta-regression showed a significant linear hierarchy of studies with the largest effects for comprehensive programs more than 1 year long that aimed to provide information on nutrition and physical activity, change attitudes, monitor behavior, modify environment, involve parents, increase physical activity and improve diet, particularly among children.

CONCLUSIONS

Unlike earlier studies, more recent studies showed convincing evidence that school-based prevention interventions are at least mildly effective in reducing BMI in children, possibly because these newer studies tended to be longer, more comprehensive and included parental support.

Is there an association between socioeconomic status and body mass index among adolescents in Mauritius?

There are no documented studies on socioeconomic status (SES) and body mass index (BMI) among Mauritian adolescents. This study aimed to determine the relationships between SES and BMI among adolescents with focus on diet quality and physical activity (PA) as mediating factors. Mauritian school adolescents (n = 200; 96 males, 104 females) were recruited using multistage sampling. Participants completed a self-reported questionnaire. Height and weight were measured and used to calculate BMI (categorised into underweight, healthy-weight, overweight, obese). Chi-square test, Pearson correlation, and Independent samples t-test were used for statistical analysis. A negative association was found between SES and BMI (χ(2) = 8.15%, P < 0.05). Diet quality, time spent in PA at school (P = 0.000), but not total PA (P = 0.562), were significantly associated with high SES. Poor diet quality and less time spent in PA at school could explain BMI discrepancies between SES groups.