Regional and district peer effects in obesity: A UK panel data analysis

Area of Science:

• Public Health
• Sociology
• Epidemiology

Background:

• Obesity research often focuses on macroeconomic or socioeconomic factors.
• Psychosocial determinants of obesity are gaining attention.
• Limited research exists on large-scale peer effects on obesity.

Purpose of the Study:

• To investigate regional and district peer effects on individual obesity in the UK.
• To model body mass index (BMI) and obesity probability based on peer BMI.
• To control for socioeconomic and other relevant variables.

Main Methods:

• Utilized British Household Panel Survey data (2004, 2006).
• Employed instrumental variable techniques to address simultaneity bias.
• Modeled individual BMI and obesity probability as functions of regional and district average BMI.

Main Results:

• No statistically significant regional peer effect on obesity was found in the UK.
• A 1-point increase in average district BMI correlated with a 0.640 increase in men's BMI and a 1.9% point increase in obesity probability.
• A 1-point increase in average district BMI correlated with a 0.230 increase in women's BMI and a 1.6% point increase in obesity probability.
• Men showed greater susceptibility to district-level peer effects than women.

Conclusions:

• District-level peer effects may significantly contribute to the rise of obesity in the UK.
• Men are more susceptible to peer influences on BMI than women.
• Further research is needed to elucidate the mechanisms of these peer effects.