Body mass and wages: New evidence from quantile estimation

Area of Science:

• Economics
• Public Health
• Sociology

Background:

• The correlation between socioeconomic status and body weight is well-documented.
• Understanding the causal relationship between body mass index (BMI) and wages is crucial for economic and public health research.

Purpose of the Study:

• To analyze the effect of body mass index (BMI) on wages across the entire wage distribution.
• To investigate potential differences in BMI's wage impact based on race, ethnicity, and gender.

Main Methods:

• Quantile regression analysis was employed to estimate the impact of BMI on wages at different points of the wage distribution.
• The study examined effects across various quantiles (e.g., .1 and .9) for different demographic groups.

Main Results:

• For White and Hispanic individuals, BMI's negative wage effect increases with income level; a 2-SD increase in BMI reduces wages by up to 16% for high-earning Hispanic females.
• For Black males, BMI shows a positive and potentially non-linear wage effect across the distribution.
• Black females exhibit more uniform wage effects from BMI across the distribution.

Conclusions:

• Wage-determining mechanisms for BMI vary significantly by race, ethnicity, and gender.
• Differential incentives to maintain lower BMI among individuals with higher income potential may explain the socioeconomic status-body weight correlation.
• Findings suggest BMI is not merely a consequence of socioeconomic status but also a potential determinant.