Summary
This 4-year natural experiment in a Chinese arts school exploited curriculum-driven variation in physical activity exposure to investigate gene–environment interactions in obesity. Weighted genetic risk scores predicted baseline obesity measures (0.21-kg/m² BMI increase per unit WGRS), and significant interactions were found: individuals with higher genetic risk experienced greater BMI and weight reduction benefits from sustained long-term physical activity. The findings suggest that genetic susceptibility modifies the protective effect of physical activity on BMI progression in adolescents.
Regional applicability
The study was conducted in China and employed Asian-derived genetic variants, which may have limited direct applicability to United Kingdom youth populations with different ancestral genetic backgrounds and lifestyle contexts. However, the mechanistic finding that physical activity can amplify BMI benefits for genetically susceptible individuals may inform UK public health messaging around activity promotion, though UK-specific validation would strengthen evidence for policy application.
Key measures
Weighted genetic risk scores (WGRS) from 13 Asian-derived obesity-related SNPs; BMI trajectories; annual anthropometric and metabolic measures; physical activity exposure (high-PA vs. low-PA groups based on curriculum-driven disparities)
Outcomes reported
The study measured how physical activity levels modify the effects of genetic risk scores on BMI trajectories over 4 years in youth. Primary outcomes were BMI changes and interactions between weighted genetic risk scores and physical activity exposure groups.
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