Research
Adherence
Obesity spreads through social networks via clustering, where individuals' BMIs converge toward the majority BMI of their social neighbors, creating self-sustaining clusters of weight status.
Your social circle significantly influences your weight. If your close friends are overweight, you are statistically more likely to gain weight, regardless of your personal efforts. Recognizing this social contagion is the first step to mitigating it.
ModerateSupportsMEDIUM confidence
For a wide variety of conditions and networks, we show that individuals with similar BMIs will cluster together into groups, and if left unchecked, current social forces will drive these groups toward increasing obesity.
Why this rating
Supported by simulation models consistent with observational data (Framingham), but not direct experimental proof of causality.
Source
Exploiting Social Networks to Mitigate the Obesity Epidemic
David B. Bahr et al. · Obesity · 2009
DOI 10.1038/oby.2008.615
mechanism_onlyCited 195×
Read the paper DOI resolved against Crossref · corpus check 2026-06-10
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- Targeting well-connected individuals (highly connected nodes in social networks) who are at the edge of a BMI cluster for weight management interventions is significantly more effective at halting the spread of obesity than targeting obese individuals in the center of clusters.Limited
- Pinning the weight of a small, random fraction (≤1%) of the population to a normal BMI, combined with increased social volatility, can reverse obesity trends and convert the majority of the population to a healthier weight.Limited
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