Overnutrition, marked by excessive energy intake leading to overweight and obesity, is a growing global epidemic. It causes 35,000 deaths annually in Southeast Asia, with overweight prevalence ranging from 8% to 30% among boys and 8% to 52% among girls. India, now the third most obese country globally, reflects this concern, particularly in urban areas where 33.2% of women and 29.8% of men are overweight or obese (NFHS-5). Adolescents are especially vulnerable due to urbanization, reduced physical activity, high screen time, irregular meals, and increased consumption of calorie-dense fast foods. These behaviors, combined with genetic predispositions, elevate risks for non-communicable diseases (NCDs) such as type 2 diabetes, hypertension, and metabolic syndrome. Studies show 12.1% overweight and 8.7% obesity prevalence in adolescents aged 13–14 years, compounded by limited physical activity and excessive screen exposure. Effective interventions include promoting balanced diets, encouraging physical activity, and behavioral counseling. While lifestyle changes are the foundation, pharmacologic treatments and bariatric surgery may be considered for severe cases with complications. Prevention strategies should address related conditions like polycystic ovarian syndrome, fatty liver, and cardiovascular risks. A collaborative approach involving families, schools, healthcare providers, and policymakers is essential for sustainable solutions. Adolescence represents a critical period for fostering lifelong healthy habits, reducing the prevalence of NCDs, and improving the health trajectory of future generations in urban India.