Conceptualizing addictive-like eating: A qualitative analysis

The qualitative evaluation of food addiction across the lifespan

Although it remains controversial, food addiction (FA) research has expanded substantially and empirical evidence for FA is growing. While quantitative studies have explored the prevalence and correlates of FA during childhood and adolescence, little is known about the perceived lived experience of FA across the lifespan, nor how experiences and perceptions of FA may change over time. For this study, 16 participants who met symptom threshold criteria for FA on the Yale Food Addiction Scale 2.0 completed in-depth, semi-structured qualitative interviews focused on their perceptions of the development of FA overtime, and perceived risk and protective factors. Thematic analysis was used to develop themes about the lived experience of FA in childhood, adolescence, and adulthood. Overall, highly palatable foods were viewed as the most problematic, while minimally processed foods were less associated with impairment and distress. Themes in childhood included a strong desire for highly processed foods and the perception that parental control over food choices could be either protective or risky for the later development of FA depending on which foods were available at home. In adolescence and young adulthood, increasing autonomy over food choices and the high availability of highly processed foods in the college environment were viewed as risk factors. Additionally, weight gain was a prominent theme. Finally, adulthood was characterized by more severe manifestations of FA, and the stress of adult responsibilities (e.g., work, parenting) contributed to this perception. This research sets the stage for future quantitative studies to explore these novel findings at the population level.

Exploring Psychological Constructs in People Receiving Treatment for Addictive Eating Behaviours: "I Hate Loving Food as Much as I Do"

Research into the complexities of addictive eating behaviours continues to develop, as a deeper understanding of this construct beyond self-report diagnostic tools emerges. In this study, we undertook structured interviews with 40 participants engaged in a personality-based management program for addictive eating, to gain insight into what situations lead people with addictive eating behaviours to overeat, and how they believe their lives would be different if they had control over their eating. A phenomenological analysis to explore compulsion and control in the context of food experiences for participants was used to construct two main themes of the addictive eating paradox and striving to transition from 'other' to 'normal'. The addictive eating paradox identified multiple contradictory experiences of a situation, e.g., 'loving food' but 'hating food'. Striving to transition from 'other' to 'normal' encompassed the idea that participants envisaged that by gaining control over their eating they could become 'normal'. This study emphasises the need to provide support and strategies to help people navigate paradoxical thoughts and presents new ideas to increase the effectiveness of interventions for individuals struggling with the complex self-beliefs held by those with addictive eating behaviours.

Early life influences on the development of food addiction in college attending young adults

PURPOSE

There is little investigation into the causes of food addiction. The aim of this study was to determine the impact of early life influences on the development of food addiction in college-attending young adults aged 18-29.

METHODS

This study utilized a sequential explanatory mixed-methods research design. College-attending young adults were invited to complete an online survey measuring Adverse Childhood Experiences (ACEs), food addiction, depression, anxiety, stress, and demographic information. Correlations between food addiction and the other variables were analyzed and significant variables were placed into a nominal logistic regression model to predict the development of food addiction. Participants who met the criteria for food addiction were invited to participate in interviews to examine their childhood eating environment and when their symptoms emerged. Interviews were transcribed and thematically analyzed. Quantitative analysis was conducted using JMP Pro Version 16.0 and qualitative analysis was conducted using NVIVO Software Version 12.0.

RESULTS

Survey respondents (n = 1645) had an overall 21.9% prevalence of food addiction. Significant correlations were observed between food addiction and ACEs, depression, anxiety, stress, and sex (p < .01 for all). Depression was the only significant predictor of the development of food addiction (OR = 3.33 95% CI 2.19, 5.05). The most common eating environment described by interview participants (n = 36) was an emphasis on diet culture, ideal body image, and restrictive environments. Symptoms frequently emerged after transitioning into college and having the ability to make their own food choices.

CONCLUSION

These results show the impact of early life eating environments and young adulthood mental health on the development of food addiction. These findings contribute to the understanding of underlying causes of food addiction.

LEVEL OF EVIDENCE

Level V, Opinions of authorities, based on descriptive studies, narrative reviews, clinical experience, or reports of expert committees.

Diet quality and eating behaviors of college-attending young adults with food addiction

BACKGROUND

College students are heavily influenced by their food environment and are an important population in which to study food addiction. This mixed-methods study aimed to examine diet quality and eating behaviors of college students with food addiction.

METHODS

Students attending a large university in November 2021 were invited to complete an online survey that measured food addiction, eating styles, eating disorder symptoms, diet quality, and anticipated feelings after eating. Kruskal-Wallis H determined differences between those with and without food addiction in mean scores of quantitative variables. Participants who met the symptom threshold for the presence of food addiction were invited to participate in an interview that elicited more information. Quantitative data was analyzed using JMP Pro Version 16.0 and qualitative data was thematically analyzed using NVIVO Pro Software Version 12.0.

RESULTS

Respondents (n = 1645) had a 21.9 % prevalence of food addiction. Individuals with mild food addiction had the highest scores in cognitive restraint. Those with severe food addiction had the highest scores in uncontrolled eating, emotional eating, and eating disorder symptoms. Individuals with food addiction showed significantly higher negative expectancies for healthy and junk food, lower intake of vegetables, higher intakes of added sugars and saturated fat. Interview participants had problems with sweets and carbohydrates most often and described eating until physically ill, eating in response to negative emotions, dissociation while eating, and strong negative feelings after eating.

CONCLUSION

Findings contribute to the understanding of the behaviors, emotions, and perceptions surrounding food by this population, providing potential behaviors and cognitions to target for treatment.

The qualitative evaluation of the Yale Food addiction scale 2.0

BACKGROUND

The Yale Food Addiction Scale 2.0 (YFAS 2.0) operationalizes food addiction (FA) by applying the Diagnostic and Statistical Manual of Mental Disorders Fifth Edition (DSM 5) criteria for substance use disorder (SUD) to the overconsumption of highly processed foods. The YFAS 2.0 has been quantitatively validated across numerous populations, but has never undergone qualitative analysis.

AIMS

Using qualitative methods we aimed to determine if the interpretation YFAS 2.0 is aligned with the DSM 5 conceptualization of SUD, to determine if any items are perceived as irrelevant to the lived-experience of FA, and to determine if there are constructs central to the lived-experience of FA that are not captured by the scale.

METHODS

We interviewed 16 participants who met criteria for FA on the modified YFAS 2.0 using semi-structured interviews to understand each participants' interpretation of items on the scale and their perceptions of how the scale matched their lived-experience of FA. Reflexive thematic analysis was used to code responses and identify themes.

RESULTS

Most interpretations aligned with the DSM 5 conceptualization of SUDs. Withdrawal and tolerance-related items were subject to some misinterpretations. Participants viewed problem-focused symptoms (e.g., interpersonal problems) as the least relevant to their lived-experience. Novel themes not included on the YFAS 2.0 (e.g., emotional eating) emerged.

SUMMARY

Our study supports the validity of the YFAS 2.0 by showing consistency with the DSM 5 conceptualization of SUDs and consistency with the lived-experience of individuals who endorse FA. Future research should explore the novel themes that emerged in this study.

Limitations of the protective measure theory in explaining the role of childhood sexual abuse in eating disorders, addictions, and obesity: an updated model with emphasis on biological embedding

In addition to its immediate negative consequences, childhood sexual abuse is associated with lifelong deleterious mental and physical health outcomes. This review employs a biopsychosocial perspective to better understand pathways from childhood sexual abuse to eating disorders, food and drug addictions, and obesity across the life course. Guided by an updated conceptual model, this review delineates how the biological embedding of childhood sexual abuse triggers a cascade of interrelated conditions that often result in failed attempts at weight suppression and eventually obesity. Such biological embedding involves pathways such as inflammation, allostatic load, reward sensitivity, activation of the hypothalamic-pituitary-adrenal axis, epigenetics, and structural and functional changes in the brain. These pathways are in turn theorized to lead to food addiction, substance use disorder, and eating disorders-each with potential pathways toward obesity over time. Predisposing factors to childhood sexual abuse including gender, culture, and age are discussed. This model calls into question the longstanding "protective measure" theory that purports individuals exposed to sexual abuse will deliberately or subconsciously gain weight in attempt to prevent future victimization. A more comprehensive understanding of the mechanisms by which childhood sexual abuse becomes biologically embedded may help clinicians and survivors normalize and/or address disordered eating and weight-related outcomes, as well as identify intervention strategies.Level of evidence: Level V: opinions of respected authorities, based on descriptive studies, narrative reviews, clinical experience, or reports of expert committees.

Development of the Hedonic Overeating–Questionnaire (HEDO–Q)

Addictive-like eating is prevalent, but a clear conceptualization and operationalization outside of an addiction framework is lacking. By adopting a biopsychological framework of food reward, this study sought to develop and evaluate a brief self-report questionnaire for the trait assessment of hedonic overeating and dyscontrol. Items in the Hedonic Overeating–Questionnaire (HEDO–Q) were constructed following a rational approach and psychometrically evaluated in a large random sample from the German population (N = 2531). A confirmatory factor analysis supported the unidimensional nature of the six-item HEDO–Q with the three postulated components of wanting, liking, and dyscontrol. Psychometric properties were favorable with good corrected item-total correlations, acceptable item difficulty and homogeneity, and high internal consistency. Population norms were provided. The HEDO–Q revealed strict measurement invariance for sex and partial invariance for age and weight status. Discriminant validity was demonstrated in distinguishing participants with versus without eating disturbances or obesity. Associations with the established measures of eating disorder and general psychopathology supported the convergent and divergent validity of the HEDO–Q. This first evaluation indicates good psychometric properties of the HEDO–Q in the general population. Future validation work is warranted on the HEDO–Q’s stability, sensitivity to change, and predictive and construct validity.

Ultra-processed food intake and eating disorders: Cross-sectional associations among French adults

Background and aims

Data regarding the association between ultra-processed food (UPF) consumption and eating disorders (ED) are scarce. Our aim was to investigate whether UPF intake was associated with different ED types in a large population-based study.

Methods

43,993 participants (mean age = 51.0 years; 76.1% women) of the French NutriNet-Santé web-cohort who were screened for ED in 2014 via the Sick-Control-One stone-Fat-Food (SCOFF) questionnaire, were included in the analysis. The clinical algorithm Expali TM tool was used to identify four ED types: restrictive, bulimic, binge eating, and other (not otherwise specified). Mean dietary intake was evaluated from at least 2 self-administered 24-h dietary records (2013-2015); categorization of food as ultra-processed or not relied on the NOVA classification. The associations between UPF intake (as percent and reflecting mean daily UPF quantity (g/d) within the dietary intake, %UPF) and ED types were evaluated using polytomous logistic regression models.

Results

5,967 participants (13.6%) were categorized as likely ED (restrictive n = 444; bulimic n = 1,575; binge eating n = 3,124; other ED n = 824). The fully-adjusted analyses revealed a positive association between UPF intake and bulimic, binge eating, and other ED: ED risk (odds ratio, OR) for an absolute 10-percentage point incremental increase in %UPF intake were 1.08 (1.01-1.14; P = 0.02), 1.21 (1.16-1.26; P < 0.0001), and 1.11 (1.02-1.20; P = 0.02), respectively. No significant association was detected for restrictive ED.

Discussion and Conclusion

This study revealed an association of UPF intake with different ED types among French adults. Future research is needed to elucidate the direction of the observed associations.

Is addictive-like eating an overlooked stroke risk factor? A study case

PURPOSE

While stroke is already considered a nutrition-related disease, the prevalence of the broad array of disordered eating behaviors is under-reported in this disease. We describe the case of a stroke in a young woman following a recent food addiction to fatty-sweet food.

METHODS

She was diagnosed with a Night-Eating-Syndrome, with a loss-of-control exclusively towards sugary carbohydrates used to manage her insomnia and distress, and her consummatory behaviors were investigated.

RESULTS

This case report illustrates a self-medication of a significant psychological distress by shifting from a healthy diet to an overconsumption of hyper-palatable foods, triggering an addiction disorder. The related hypertriglyceridemia, on top of chronic smoking, contributed to the development of an atherosclerotic plaque and thrombus formation.

CONCLUSION

Food addiction might be considered as an emerging stroke risk factor. We suggest it fosters the need to take into consideration addictive-like eating behaviors and associated mental disorders in the primary and secondary prevention of stroke. This may be particularly relevant for the prevention of stroke in women as they are more prone to comfort their emotions with food.

LEVEL OF EVIDENCE

V, descriptive study.

Examining impairment and distress from food addiction across demographic and weight groups

Rates of food addiction (FA) vary across weight and demographic groups. Factors influencing discrepant prevalence rates are largely unknown. Rates of clinically significant distress or impairment also vary across demographic groups, yet prior studies have overlooked the diagnostic significance of distress/impairment in heterogenous groups. We tested if weight and demographic groups differed in their likelihood of endorsing distress/impairment from FA. Participants (N = 1832) recruited from Amazon Mechanical Turk completed the modified Yale Food Addiction Scale 2.0 (mYFAS). The mYFAS includes 11 dichotomous symptom indicators and one dichotomous distress/impairment indicator. Differences in distress/impairment were tested across weight, sex, racial/ethnic, and educational groups using logistic regression. FA severity was controlled for using FA symptom count. There were no differences among racial/ethnic and educational groups (p > 0.05). Compared to men, women were more likely to report distress/impairment (aOR = 1.96, 95% CI = 1.28-3.03). People with obesity were more likely to report distress/impairment compared to people with overweight (aOR = 2.20, 95% CI = 1.39-3.49) or normal weight (aOR = 1.99, 95% CI = 1.26-3.13). Individual characteristics (i.e., sex, weight) may influence reporting of distress/impairment from FA. Further inquiry may be appropriate for men and people with normal weight or overweight presenting with FA symptoms who otherwise deny distress/impairment.

Highly processed food addiction: A concept analysis

AIM

This concept analysis aims to clarify the highly processed food addiction (HPFA) concept and discuss its implications for treating obesity.

BACKGROUND

Emerging empirical evidence suggests addictive-like eating may contribute to obesity in some individuals, increasing interest in HPFA's role in obesity. Clarifying the HPFA concept will aid in developing individualized interventions for patients with obesity and HPFA.

DESIGN

This concept analysis followed Walker and Avant's approach. The case studies are of participants in a study that included individuals with and without HPFA (Yale Food Addiction Scale 2.0-diagnosed).

DATA SOURCE

We searched PubMed, CINAHL, PsychInfo, and Ebscohost databases. Keywords were "food addiction" and "food addiction concept."

REVIEW METHODS

Criteria included recent reviews and empirical studies that measured HPFA and focused on HPFA characteristics and/or treatment implications.

RESULTS

The model case displayed all 11-substance use disorder (SUD) symptoms and clinical significance, supporting a severe HPFA diagnosis. The contrary case was negative for all YFAS 2.0 symptoms and clinical significance and did not eat compulsively or experience cravings. The borderline case met the minimum symptom criteria for severe HPFA but not clinical significance. Clinical interviews may help determine whether such individuals truly exhibit addictive-like eating behaviors.

CONCLUSIONS

Growing empirical evidence and our case studies support the HPFA concept and the utility of the YFAS/YFAS 2.0 for identifying a distinct subset of individuals with overweight/obesity who may benefit from interventions developed to treat established SUDs. Future research should examine HPFA separately and in relation to obesity and eating disorders and include longitudinal studies and gender-balanced samples.

Prevalence and correlates of food addiction: Systematic review of studies with the YFAS 2.0

BACKGROUND

Research on food addiction (FA) has been growing and increasing interest has been seen in comprehending its mechanisms and clinical and psychological correlates of this phenomena. This field of study is specially apply to understand obesity and eating behavior issues related to eating disorders (ED).

OBJECTIVES

We performed a literature review that describe recent research using the updated version of the Yale Food Addiction Scale (YFAS 2.0) or modified-YFAS (mYFAS 2.0), from the date of its publication.

METHODS

Search were performed in Web of Science, Pubmed and PsycNET databases for studies that used the YFAS 2.0 and mYFAS 2.0.

RESULTS

The studies (n = 53) investigated adaptation and validation of the scale in different cultures (n = 13), prevalence on nonclinical populations and representative samples (n = 5), food addiction in obesity samples (n = 11), in samples with ED and disordered eating (n = 10) and studies that investigated FA in association with other clinical and psychological variables (n = 14).

DISCUSSION

Studies with the YFAS 2.0 reveal higher prevalence of FA in different samples, and a great association between FA and BED, BN and obesity. Implications for diagnostic of this phenomena and the overlap between FA and other disorders are discussed.

CONCLUSIONS

The field of FA remains an open subject and effort must be implied to understand the subjective experience of addiction related to eating and food.

Body image disturbance partially explains eating-related psychosocial impairment in food addiction

BACKGROUND

This study aimed to explore the association of food addiction (FA) with eating-related psychosocial impairment and examine the extent to which this association was explained directly by FA symptoms themselves, versus through body image disturbance.

MATERIALS AND METHODS

Participants (356 university students and 544 crowdsourced adults) completed self-report measures of FA (Yale Food Addiction Scale; YFAS 2.0), psychosocial impairment (Clinical Impairment Assessment; CIA 3.0), and body image disturbance (Eating Disorders Examination Questionnaire; EDE-Q 6.0), and reported their body mass index (BMI) and gender.

RESULTS

Endorsement of distress and/or impairment on the YFAS corresponded to ratings on the CIA. Structural equation models indicated the relationship between FA and eating-related psychosocial impairment was partially mediated by body image disturbance. The indirect effect of body image disturbance explained more variance in eating-related psychosocial impairment than did YFAS scores themselves. Neither BMI nor gender significantly moderated any direct or indirect pathways from food addiction to psychosocial impairment.

CONCLUSIONS

Food addiction is associated with clinical impairment in men and women across the weight spectrum. A large portion of psychosocial impairment associated with food addiction may be explained by body image disturbance. Due to its role in explaining psychosocial impairment, body image disturbance warrants increased attention in FA research.

Process Evaluation of a Personality Targeted Intervention for Addictive Eating in Australian Adults

Addictive eating prevalence is estimated at 15-20% in studied populations, and is associated with concurrent mental health conditions and eating disorders as well as overweight and obesity. However, few evidence-based interventions targeting addictive eating are available. The further development of evidence-based interventions requires assessment of intervention feasibility and efficacy. This study aimed to determine the feasibility, including intervention delivery and program acceptability, of FoodFix; a personality targeted intervention for the treatment of addictive eating behaviours in Australian adults. Participants (n = 52) were randomised to intervention (n = 26) or wait-list control groups (n = 26) and received three personalised telehealth sessions with an Accredited Practising Dietitian over seven weeks. Intervention delivery was assessed by tracking adherence to scheduled timing of intervention sessions. Program acceptability of participants was assessed via an online process evaluation survey and program acceptability of intervention providers was assessed via semi-structured phone interviews. In total, 79% of participants adhered to scheduled timing for session two and 43% for session three, defined as within one week (before/after) of the scheduled date. Further, 21% of participants completed the process evaluation survey (n = 11). The majority of participants were extremely/very satisfied with FoodFix (n = 7, 63%). Intervention providers (n = 2) expressed that they felt adequately trained to deliver the intervention, and that the overall session format, timing, and content of FoodFix was appropriate for participants. These findings highlight the importance of assessing intervention feasibility to further understand intervention efficacy.

No control and overwhelming cravings: Australian adults' perspectives on the experience of food addiction

Research in the area of food addiction is continuing to increase with recent reviews suggesting that food addiction is a distinctive condition that has many symptoms similar to substance use disorders. The current study explored the perspectives and experiences of Australian adults seeking treatment for addictive eating. Quantitative data for this study was collected via self-report questionnaires completed online, including demographics, the Yale Food Addiction Scale 2.0, and the Depression, Anxiety, and Stress Scale-21. Qualitative data was collected via semi-structured interviews using open-ended questions about the individual experience of food addiction and perspectives regarding intervention and recovery. Interview data was available for 34 participants, with the majority (n = 33) being females who were overweight, (mean ± SD age = 42.9 ± 13.2 years, BMI=36.5 ± 6.8 kg/m²). Stress (19.9 ± 11.4 out of 21) and depression (16.8 ± 10.2 out of 21) were the most prominent negative emotional states. Thematic analysis identified two themes of compulsion and control. Compulsion distinguished the participants' experiences related to addictive eating behaviours, in particular the notion of craving. Control encompassed their perception of both the processes and outcomes of overcoming their addictive eating. The two themes identified were not mutually exclusive, and relationships between them and their influence on each other were observable. This study provides a unique contribution to understanding adults' experience of food addiction by highlighting the strong desire to be in control of eating behaviours, and the inability of participants to overcome their compulsions to eat specific food despite minimal anticipation of positive effect.

An evaluation of food addiction as a distinct psychiatric disorder

OBJECTIVE

To evaluate the state of the literature for whether food addiction may warrant consideration as a distinct psychiatric disorder in the Diagnostic and Statistical Manual (DSM) using Blashfield et al.'s (1990; Comprehensive Psychiatry, 31(1), 15-19) five criteria. This framework was utilized because it has recently been applied to examine the diagnostic utility of several eating disorder phenotypes. The criteria are: (a) at least 50 journal articles published on the proposed syndrome in the past 10 years; (b) proposal of diagnostic criteria and assessment measures; (c) clinician reliability in diagnosis; (d) cohesiveness of the proposed diagnostic criteria; and (e) differentiation from similar, existing diagnostic categories.

METHOD

For each criterion, a literature review was conducted to examine if the minimum qualification had been met, and key findings were discussed.

RESULTS

Two of the criteria (literature and differentiation) have been empirically supported to extent specified. Two criteria (diagnostic criteria and syndrome) have been partially fulfilled, due to only having self-report assessment measures and no examination of the odds ratios for meeting more than one symptom, respectively. Clinician reliability has not yet been evaluated.

DISCUSSION

The existing literature suggests that food addiction may warrant consideration as a proposed diagnostic category in the DSM, though future research is needed to fulfill Blashfield et al.'s (1990; Comprehensive Psychiatry, 31(1), 15-19) criteria. The development of a semi-structured interview would be an impactful contribution for addressing these gaps.

The Psycho-Affective Roots of Obesity: Results from a French Study in the General Population

The aim of the study was to examine the extent to which obese people differ in their emotionally driven and addictive-like eating behaviors from normal-weight and overweight people. A total of 1142 participants were recruited from a general population, by a web-based cross-sectional survey assessing anxiety/depression (Hospital Anxiety and Depression Scale), emotional eating (Emotional Appetite Questionnaire), food addiction (modified Yale Food Addiction Scale), and intuitive eating (Intuitive Eating Scale-2). The statistical design was based on analyses of (co)variance, correlograms, and mediations. A set of Body Mass Index (BMI) group comparisons showed that obese people reported higher levels of depression and emotional eating and that they experienced more severe and frequent food addiction symptoms than overweight and normal-weight people. Associations between anxiety, depression, food addiction symptoms’ count, and the difficulties to rely on hunger and satiety cues were found across all weight classes, suggesting that addictive-like eating may represent a unique phenotype of problematic eating behavior that is not synonymous with high BMI or obesity. Conversely, the interrelation between anxiety/depression, emotional eating, and the difficulties to rely on hunger and satiety cues was found only among obese participants, and negative emotional eating mediated the association between depression and anxiety and the difficulties to rely on hunger and satiety cues. This study emphasizes the necessity to develop more comprehensive approaches integrating emotional dysregulation and addictive-like eating behaviors to improve weight management and quality of life of obese people.

Separating the Signal from the Noise: How Psychiatric Diagnoses Can Help Discern Food Addiction from Dietary Restraint

Converging evidence from both animal and human studies have implicated hedonic eating as a driver of both binge eating and obesity. The construct of food addiction has been used to capture pathological eating across clinical and non-clinical populations. There is an ongoing debate regarding the value of a food addiction "diagnosis" among those with eating disorders such as anorexia nervosa binge/purge-type, bulimia nervosa, and binge eating disorder. Much of the food addiction research in eating disorder populations has failed to account for dietary restraint, which can increase addiction-like eating behaviors and may even lead to false positives. Some have argued that the concept of food addiction does more harm than good by encouraging restrictive approaches to eating. Others have shown that a better understanding of the food addiction model can reduce stigma associated with obesity. What is lacking in the literature is a description of a more comprehensive approach to the assessment of food addiction. This should include consideration of dietary restraint, and the presence of symptoms of other psychiatric disorders (substance use, posttraumatic stress, depressive, anxiety, attention deficit hyperactivity) to guide treatments including nutrition interventions. The purpose of this review is to help clinicians identify the symptoms of food addiction (true positives, or "the signal") from the more classic eating pathology (true negatives, or "restraint") that can potentially elevate food addiction scores (false positives, or "the noise"). Three clinical vignettes are presented, designed to aid with the assessment process, case conceptualization, and treatment strategies. The review summarizes logical steps that clinicians can take to contextualize elevated food addiction scores, even when the use of validated research instruments is not practical.

Food Addiction Mediates the Relationship between Perceived Stress and Body Mass Index in Taiwan Young Adults

Perceived stress is the degree of stress experienced by an individual in the face of a stressor. Studies have shown that stress affects emotions, leads to behavioral changes, and is likely to trigger physical illnesses. According to the World Health Organization (WHO), stress is classified as a health epidemic of the 21st century; in the meantime, the percentage of adults being overweight and with obesity has continued to grow after reaching 38.9% in 2016. Hence, it is unclear whether perceived stress has become a factor affecting progressive obesity and whether food addiction (FA) is an intermediate factor. The purposes of this study were to (1) investigate the FA prevalence among young adults in Taiwan, (2) understand correlations among perceived stress, FA, and the body mass index (BMI), and (3) determine the potential mediating effect of FA due to perceived stress on BMI. The study was conducted through an online questionnaire, composed of a basic data form, the Perceived Stress Scale (PSS), and the Yale Food Addiction Scale (YFAS). We received 1994 responses and analyzed 1780 valid samples. Results showed that 231 participants met the FA criteria, accounting for 12.98%. Perceived stress was positively correlated with BMI (95% confidence interval (CI) 0.013~0.088, p-value 7.8 × 10⁻³), and perceived stress was positively associated to FA (95% CI 1.099~1.154, p-value < 10⁻⁴), which was also positively correlated with BMI (95% CI 0.705~2.176, p-value 10⁻⁴). FA significantly mediated the relationship between PSS and BMI with an indirect effect size of 25.18% and 25.48% in the group that scored 31~40 on the PSS. The study concluded that among people seeking weight loss, proper stress management and screening for FA in order to apply related therapies may be an effective method for weight management.

How Lifestyle Factors Affect Cognitive and Executive Function and the Ability to Learn in Children

In today's research environment, children's diet, physical activity, and other lifestyle factors are commonly studied in the context of health, independent of their effect on cognition and learning. Moreover, there is little overlap between the two literatures, although it is reasonable to expect that the lifestyle factors explored in the health-focused research are intertwined with cognition and learning processes. This thematic review provides an overview of knowledge connecting the selected lifestyle factors of diet, physical activity, and sleep hygiene to children's cognition and learning. Research from studies of diet and nutrition, physical activity and fitness, sleep, and broader influences of cultural and socioeconomic factors related to health and learning, were summarized to offer examples of research that integrate lifestyle factors and cognition with learning. The literature review demonstrates that the associations and causal relationships between these factors are vastly understudied. As a result, current knowledge on predictors of optimal cognition and learning is incomplete, and likely lacks understanding of many critical facts and relationships, their interactions, and the nature of their relationships, such as there being mediating or confounding factors that could provide important knowledge to increase the efficacy of learning-focused interventions. This review provides information focused on studies in children. Although basic research in cells or animal studies are available and indicate a number of possible physiological pathways, inclusion of those data would distract from the fact that there is a significant gap in knowledge on lifestyle factors and optimal learning in children. In a climate where childcare and school feeding policies are continuously discussed, this thematic review aims to provide an impulse for discussion and a call for more holistic approaches to support child development.