Childhood overweight and obesity are defined as crises that adversely affect health and well-being, pave the way for various health problems in the future, and are increasingly prevalent worldwide. Obesity is a significant public health issue as it predisposes children and adolescents to lifelong diseases and contributes to increased mortality and morbidity in adulthood. Eating behavior irregularities and excesses during childhood and adolescence lead to deteriorating health and rising obesity incidence. This condition causes significant issues in the respiratory, endocrine, cardiovascular, digestive, and orthopedic systems while also creating psychological effects, such as weight-related dissatisfaction and social exclusion.

The dramatic increase in childhood obesity worldwide indicates that children's health habits have shifted over time. Effective lifestyle modifications and behavioral interventions focusing on healthy nutrition, physical activity, and stress management are essential for preventing and reducing obesity. Since children and adolescents spend most of their time in schools or extracurricular activities, schools play a crucial role in instilling healthy behaviors. Healthy eating habits established during adolescence often translate into sustainable lifestyle choices in adulthood, underscoring the importance of addressing obesity at an early stage.

Social media-supported awareness programs developed to prevent obesity can be an effective solution, especially for overweight and obese adolescents. Combatting obesity during childhood and adolescence is vital for reducing lifelong obesity risks and promoting overall health. Identifying and controlling risk factors associated with obesity are critical steps in improving individuals' quality of life.

Aim This study aims to evaluate the effectiveness of an obesity prevention program designed for overweight and obese adolescents and supported by social media reminders.

Significance In recent years, obesity has become a widespread public health issue affecting all age groups, including adolescents. Sedentary lifestyles and evolving living standards are considered primary contributors to this trend. Adolescents' awareness of obesity as a health issue and their adoption of healthy lifestyle habits are key components in fighting obesity. Particularly in school environments, promoting healthy eating habits and enhancing knowledge can effectively reduce obesity incidence.

This study seeks to assess adolescents' obesity status, eating addictions, nutritional literacy, and obesity awareness, thereby fostering healthy behavioral changes. The findings of this research are expected to fill gaps in the existing literature and guide future strategies in combating obesity.

Inclusion Criteria:

• Voluntary participation in the study
• Being classified as overweight or obese according to BMI classification
• Currently enrolled in a high school in the district
• Having parental consent to participate in the study
• Having no physical or mental disabilities or chronic illnesses (e.g., diabetes, metabolic syndrome, heart disease, etc.)
• Having a social media account
• Using the internet and owning a smartphone

Exclusion Criteria:

• Incomplete completion of the study data collection forms
• Withdrawal from participation in the study
• Transferring to another school during the intervention period
• Discontinuing internet and phone usage during the intervention period
• Developing a chronic illness during the intervention period