Sociodemographic differences in fast food price sensitivity

Area of Science:

• Public Health
• Nutritional Epidemiology
• Health Economics

Background:

• Fiscal food policies, such as taxes, are proposed to enhance population health.
• The impact of these policies on health disparities remains unclear.

Purpose of the Study:

• To determine how changes in fast food prices affect consumption and cardiometabolic health within specific demographic subgroups.
• To investigate the differential effects of fast food pricing on various racial, income, and education groups.

Main Methods:

• Analysis of a 20-year prospective biracial cohort study (Coronary Artery Risk Development in Young Adults - CARDIA).
• Linking community-level fast food price data with individual-level data on consumption, body mass index (BMI), and insulin resistance (HOMA-IR).
• Utilizing multivariable regression with interaction terms to assess subgroup-specific effects.

Main Results:

• Fast food consumption showed a nonlinear inverse association with price, with higher prices leading to reduced intake.
• Price sensitivity varied significantly by race, income, and education level.
• Differential effects on insulin resistance (HOMA-IR) and BMI were observed across sociodemographic groups, with some groups showing inverse relationships and others positive.

Conclusions:

• Sociodemographic groups disproportionately affected by chronic diseases exhibited greater sensitivity to fast food prices regarding consumption and insulin resistance.
• Findings support the potential of fiscal policies, like fast food taxes, to mitigate diet-related health disparities.