Understanding Obesity through a Public Health Lens.

Obesity is a complex and chronic public health challenge that reflects deep-rooted social, economic, and environmental determinants rather than solely individual choices. Its global prevalence has risen sharply over recent decades, affecting more than one in eight people worldwide, with a growing burden in low- and middle-income countries. This paper explores obesity as a complex and growing public health challenge that extends beyond individual behavior. It highlights the social, economic, and environmental factors driving the epidemic, with a focus on the Indian context where undernutrition and overnutrition coexist. Recent research, population data, and policy reports were reviewed to analyze current trends, determinants, and the limitations of traditional measures such as the body mass index (BMI). Particular attention was given to South Asian populations, who are prone to obesity-related diseases at lower BMI thresholds. Global obesity rates have risen sharply, now affecting more than one in eight people, with a marked increase in low- and middle-income countries. In India, urbanization, sedentary lifestyles, and the easy availability of ultraprocessed foods have accelerated the problem across all age groups. The COVID-19 pandemic worsened the situation through reduced physical activity, stress, and food-system disruptions. Conventional BMI measures underestimate true metabolic risk in South Asians, underscoring the need for more nuanced diagnostic approaches. Obesity adds significantly to the burden of noncommunicable diseases and demands multisectoral action through healthier food policies, physical activity promotion, and early prevention. Integrating these strategies into health systems is vital to reduce its long-term impact.