Epidemiology and Prevention of Childhood Obesity

Childhood obesity has emerged as a major global public health challenge, with prevalence having doubled in many regions over the past two decades. Epidemiological data reveal that excess weight in children is influenced by a complex interplay of genetic predisposition, dietary habits, physical inactivity, socio-economic factors and the built environment. Urbanisation and the increasing availability of energy-dense, nutrient-poor foods exacerbate the trend, while sedentary behaviours such as extended screen time contribute to energy imbalance. The health consequences extend beyond childhood, predisposing individuals to type 2 diabetes, cardiovascular disease and psychosocial morbidity. Prevention strategies now emphasise multilevel interventions that integrate individual behaviour change—encouraging balanced diets, regular physical activity and reduced sedentary time—with policy approaches such as taxation of sugar-sweetened beverages, regulation of marketing to children and the improvement of school food environments. Community and family engagement are recognised as critical, as are early surveillance systems and the rigorous evaluation of interventions. A coordinated framework combining legislative action, evidence-based clinical guidance and culturally tailored community programmes is essential to arrest the upward trajectory of childhood obesity and mitigate its long-term burdens.

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Epidemiology and Prevention of Childhood Obesity publication trend

The graph below shows the total number of articles in epidemiology and prevention of childhood obesity across all publications each year (not limited to Nature Index journals).

Technical terms

Body mass index (BMI): A measure of weight relative to height (kg/m²) used to classify underweight, healthy weight, overweight and obesity.

Adiposity: The amount and distribution of body fat in an individual, often linked to metabolic and cardiovascular risk.

Prevalence: The proportion of a population affected by a specific condition at a given point in time.

Cluster-randomised controlled trial: A study design in which groups (for example, schools) are randomly assigned to receive an intervention or serve as controls.

Ultra-processed foods (UPFs): Industrially manufactured products high in added sugar, fats and salt, associated with poor dietary quality and weight gain.

References

1. Overweight and Obesity Among In‐School Children and Adolescents (5–19 Years) in Ghana: A Scoping Review of Prevalence and Risk Factors. Journal of Obesity (2024).
2. Impact of a school-based health intervention program on body composition among South African primary schoolchildren: results from the KaziAfya cluster-randomized controlled trial. BMC Medicine (2022).
3. Informing Diet and Physical Activity Interventions with Family Involvement in an Urban Setting: Views of Children and Adults in Lagos, Nigeria. Sustainability (2023).
4. Epidemiology, Predisposing Factors, Biomarkers, and Prevention Mechanism of Obesity: A Systematic Review. Journal of Obesity (2020).