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Adolescence represents a critical period for the development of obesity and related health behaviors, as dietary habits, physical activity patterns, and lifestyle choices established during this stage often persist into adulthood. Rising rates of adolescent obesity are linked to multiple factors, including increased consumption of energydense, nutrient-poor foods, decreased physical activity, and the growing influence of digital media. Schools provide a unique setting for obesity-prevention efforts because they reach large populations of adolescents and can integrate structured educational programs, environmental modifications, and behavioral interventions to support healthier lifestyle choices. This study evaluated the effectiveness of a comprehensive school-based nutritional intervention designed to improve dietary habits, reduce Body Mass Index (BMI) progression, and promote long-term weight-management skills among adolescents.

The study involved six public secondary schools, with students aged 12 to 16 years. A total of 360 adolescents participated, with schools randomized into intervention (n=3) or control (n=3) groups. The intervention consisted of three primary components: curriculumbased nutrition education, environmental modifications in school cafeterias, and engagement activities designed to reinforce healthy eating behaviors. Nutrition education classes, delivered weekly over a 16-week period, emphasized fundamental concepts such as balanced macronutrient intake, portion control, label reading, and strategies for reducing added sugar and saturated-fat consumption. Classes also addressed the importance of hydration, mindful eating, and the longterm health consequences of poor dietary habits.

Cafeteria modifications included the introduction of healthier options, such as fruits, vegetables, whole grains, and lean proteins, alongside the reduction of sugar-sweetened beverages and energydense snacks. Visual cues and signage were used to highlight healthier choices, while unhealthy options were positioned less prominently. Students were encouraged to select balanced meals and were provided with interactive tools, such as food guides and meal-planning worksheets, to enhance understanding and engagement.

Behavioral reinforcement activities included peer-led challenges, goal-setting exercises, and interactive workshops designed to encourage consistent application of nutritional knowledge. Students were prompted to track their meals, set personal health goals, and reflect on progress during group discussions. These activities aimed to foster autonomy, self-efficacy, and intrinsic motivation, which are critical for sustaining behavior change beyond the program period.

Anthropometric measurements, including height, weight, and BMI, were recorded at baseline and after 16 weeks. Dietary intake was assessed through self-reported 3-day food diaries and food-frequency questionnaires, while physical activity levels were evaluated using standardized questionnaires. Additional data on psychosocial factors, including attitudes toward healthy eating, self-efficacy, and social support, were collected to assess broader impacts of the intervention.

Results demonstrated meaningful improvements in both dietary behaviors and anthropometric outcomes among intervention participants. Adolescents in the intervention group significantly increased fruit and vegetable consumption, reduced intake of sugarsweetened beverages, and reported lower consumption of fast foods and packaged snacks compared with controls. Mean daily energy intake decreased by an average of 180 kilocalories, with a shift toward higher protein and fiber consumption. These dietary changes were accompanied by modest but significant reductions in BMI z-scores, indicating slowed progression of obesity risk compared with control participants, whose BMI continued to increase slightly over the same period.

Psychosocial outcomes also improved. Students in the intervention group reported higher self-efficacy for making healthy food choices, greater awareness of nutrition concepts, and more positive attitudes toward fruits, vegetables, and balanced meals. Peer support and family engagement were identified as important mediators of success, with students citing encouragement from classmates and parental involvement as key factors facilitating adherence to healthier behaviors. Several mechanisms underlie the observed outcomes. Structured education improves knowledge and decision-making skills, equipping adolescents with practical tools for choosing healthier foods. Environmental modifications enhance the accessibility and visibility of nutritious options, reducing reliance on energy-dense alternatives. Behavioral reinforcement and goal-setting foster sustained engagement, intrinsic motivation, and confidence in the ability to make positive dietary changes, all of which are critical during adolescence when autonomy and social influences are particularly salient.

Despite promising results, the study faced certain limitations. Dietary intake relied on self-report, which may be subject to recall bias or underreporting, particularly for high-calorie foods. Physical activity outside of school hours was not objectively measured, making it difficult to fully account for energy expenditure differences. The intervention duration, while sufficient to observe short-term effects, may not capture the long-term sustainability of behavior change, and follow-up assessments are necessary to evaluate whether improvements persist. Additionally, variations in implementation fidelity across schools may have influenced outcomes, highlighting the importance of consistent training, supervision, and program support.

In conclusion, school-based nutritional interventions that combine structured education, environmental modifications, and behavioral reinforcement can effectively promote healthier dietary habits and slow BMI progression among adolescents. By addressing both knowledge and environmental determinants of food choices, these programs equip young people with practical skills and supportive contexts for making sustainable lifestyle changes. Early intervention during adolescence is critical for preventing obesity and establishing patterns that support lifelong health, highlighting the role of schools as essential platforms for public-health initiatives aimed at combating the rising prevalence of adolescent obesity.