Could foods teenagers eat and drinks they choose offer clues to their mental health? In recent study published in journal Child and Adolescent Mental Health, researchers investigated whether greater fruit and vegetable intake and lower sugar-sweetened beverage (SSB) consumption were linked to common mental disorder (CMD) risk among adolescents in Australia. While greater fruit intake was linked to lower risks of meeting screening thresholds for depression and anxiety, higher SSB intake was associated with greater risk, with numerically stronger association for anxiety among males.
Fruit intake had inverse relationship with both outcomes, with depression risk 13% lower and anxiety risk 7% lower for each additional daily serving, suggesting modest but meaningful association.
Based on findings, everyday dietary choices may be relevant to adolescent mental health and inform early prevention strategies, highlighting potentially modifiable area for intervention and support.
What Children And Teenagers Eat May Affect Mental Well-Being
What children and teenagers eat may affect their mental well-being, but evidence is not yet consistent, much of research so far captured diet and mental health at single point in time. While studies that followed young people over longer periods have reached different conclusions, more research needed to clarify relationship between specific dietary factors and CMD risk over time. Dietary habits established during childhood and adolescence may have lasting implications for mental well-being and could represent important area for early prevention and health promotion. Because diet is potentially modifiable, exploring associations between specific dietary factors and CMD risk could help healthcare providers develop interventions to prevent or delay CMD onset effectively.
In present study, researchers investigated whether fruit, vegetable and SSB consumption was associated with meeting screening thresholds for anxiety and depression over three years among 6537 adolescents (mean age approximately 13 years, about half female) across 71 schools in Australia. Depression and anxiety outcomes were determined based on binary cut-offs in validated symptom scales, rather than clinical diagnoses, providing screening thresholds for elevated symptoms and risk. To assess depression among participants, team evaluated eight items of Patient Health Questionnaire-Adolescent (PHQ-A-8), excluding assessment of thoughts of suicide for ethical and screening considerations.
Anxiety levels were evaluated using 13-item Patient-Reported Outcomes Measurement Information System Anxiety-Pediatric (PROMIS-AP) scale, validated measure for anxiety symptoms in pediatric populations and adolescents.
Participants attended secondary schools in New South Wales, Queensland, and Western Australia, and had previously taken part in Health4Life trial, completing digital surveys at baseline (Grade 7, 12-13 years) and again after one, two, three years.
They reported daily intake of vegetables, fruit, and SSBs, portion size 150 grams represented one serving fruit, while one serving vegetables was 75 grams, consistent with National Health and Medical Research Council (NHMRC) guidelines.
SSB intake was based on cups of sport drinks, soft drinks, or cordials, including lemonade, Coke, and Gatorade, reported weekly or daily and converted into cups per day for analysis. Team used statistical models to assess associations between self-reported dietary intake and CMD risk over time, accounting for sex, age, physical activity, trial allocation, timepoint, family affluence.
To assess participants socioeconomic background, researchers evaluated family affluence using FAS III questionnaire, results stratified by sex, sensitivity analyses tested models fewer covariates and assessed influence missing data. Participants who met relevant symptom threshold at baseline, or who lacked baseline outcome information, were excluded to focus on symptoms that increased during follow-up period and new onset.
Females Higher Fruit Vegetable Intake Males Consumed SSBs More Frequently
Family affluence scores indicated medium-to-high socioeconomic status among participants, over time, females generally had higher fruit and vegetable intake, whereas males consumed SSBs more frequently than females. Adolescents who ate more fruit tended to have lower risks of elevated symptoms of depression and anxiety, findings similar between sexes for depression, but fruit-anxiety association not statistically significant when each sex analyzed separately.
In adjusted models, greater vegetable consumption showed no statistically significant association with depression or anxiety, contrasting with fruit and SSB findings and suggesting different dietary components have varying relationships. By comparison, greater SSB consumption was linked to increased risk of meeting CMD symptom thresholds, positive link observed in both sexes, with larger risk estimates among males, especially for anxiety. Analyses did not establish whether apparent sex difference was statistically meaningful, researchers used multiple imputation to estimate missing survey values in main analyses for robustness.
Analyses with fewer covariates supported main findings, but complete-case analyses no longer showed significant associations between fruit and anxiety overall or between fruit and depression among males, highlighting sensitivity to missing data handling.
Researchers proposed SSB associations might involve circulating inflammatory biomarkers or hormones such as cortisol, both of which may influence mood and stress response and mental health. This study did not test these mechanisms, and SSB consumption may also reflect other dietary and behavioral patterns that were not fully measured, requiring future investigation of biological pathways.
Future studies should investigate causal associations and explore biological pathways that may contribute to internalizing symptoms, including inflammation, cortisol, and overall dietary patterns and lifestyle factors.
Adolescents Who Ate More Fruit And Drank Fewer SSBs Less Likely To Screen Positive
Findings suggest adolescents who ate more fruit and drank fewer SSBs were less likely to screen positive for anxiety and depression during three-year study period, associations more consistent for SSBs than for fruit. No significant association found for vegetables, this may be especially relevant since adolescence is period of heightened sensitivity to environmental influences and opportunity for early prevention strategies.
Observational design, self-reported diet, potential unmeasured confounding, and reliance on symptom screening mean findings cannot establish whether dietary changes prevent mental disorders, but suggest relevant associations worth exploring.
If further studies confirm associations, health policies and school programs could be designed to improve dietary habits among young people as part of broader mental health prevention efforts and health promotion. Future studies could examine how dietary components, including lean proteins, healthy fats, whole grains, and ultra-processed foods (UPFs), relate to CMD risk and whether better adolescent eating habits could reduce long-term burden of these disorders. Influence of potential confounders such as race, ethnicity, total energy intake per day, household dietary patterns, family structure, and history of mental health disorders in families should also be explored in both sexes for comprehensive understanding.
Q&A
Q: What did Australian study of 6537 adolescents over three years find about fruit intake and depression anxiety risk?
A: Fruit intake had inverse relationship both outcomes depression risk 13% lower anxiety risk 7% lower each additional daily serving, greater fruit intake linked lower risks meeting screening thresholds depression anxiety, findings similar between sexes depression fruit-anxiety not statistically significant separately.
Q: How was higher sugar-sweetened beverage SSB consumption linked to common mental disorder CMD risk among teenagers?
A: Greater SSB consumption linked increased risk meeting CMD symptom thresholds observed both sexes larger risk estimates among males especially anxiety, analyses did not establish whether sex difference statistically meaningful, researchers proposed involving circulating inflammatory biomarkers hormones cortisol influencing mood but not tested mechanisms.
Q: Did vegetable consumption show significant association with depression or anxiety in Australian adolescents study?
A: In adjusted models greater vegetable consumption showed no statistically significant association with depression or anxiety, contrasting fruit inverse relationship and SSB positive link, suggesting different dietary components have varying relationships with mental health screening thresholds over three-year follow-up period.
FAQ
Q: How was diet assessed in Health4Life trial across 71 schools New South Wales Queensland Western Australia?
A: Participants completed digital surveys baseline Grade 7 12-13 years again after one two three years reporting daily intake vegetables fruit SSBs, portion 150 grams fruit 75 grams vegetables consistent NHMRC guidelines, SSB cups sport drinks soft drinks cordials lemonade Coke Gatorade converted cups per day.
Q: What are limitations of observational self-reported diet study relying on symptom screening not clinical diagnoses?
A: Observational design self-reported diet potential unmeasured confounding reliance symptom screening mean findings cannot establish whether dietary changes prevent mental disorders, self-reported intake may reflect other dietary behavioral patterns not fully measured, future studies should investigate causal associations biological pathways internalizing symptoms confounders race ethnicity energy intake.
Q: Could everyday dietary choices inform early prevention strategies for adolescent mental health according to findings?
A: Based findings everyday dietary choices may be relevant adolescent mental health inform early prevention strategies, adolescents ate more fruit drank fewer SSBs less likely screen positive anxiety depression three-year period, if further studies confirm health policies school programs could improve dietary habits part broader prevention.
Q: What future research should explore beyond fruit vegetables SSBs for CMD risk in teenagers?
A: Future studies could examine lean proteins healthy fats whole grains ultra-processed foods UPFs relate CMD risk whether better adolescent eating habits could reduce long-term burden disorders, influence confounders race ethnicity total energy intake household dietary patterns family structure history mental health disorders families both sexes.
Q: Why is adolescence period of heightened sensitivity to environmental influences relevant for dietary habits and mental well-being?
A: Dietary habits established during childhood adolescence may have lasting implications mental well-being could represent important area early prevention, because diet potentially modifiable exploring associations could help develop interventions prevent delay onset, adolescence heightened sensitivity environmental influences making findings especially relevant early prevention opportunity.
Disclaimer: This article provides educational information about teenagers diet, fruit vegetable SSB intake, depression anxiety screening thresholds, Australian adolescent study, and does not constitute professional medical, nutritional, psychiatric, or mental health advice, diagnosis, or treatment recommendation.
