Possibly the government could just check whether people are poor before they let them enter a restaurant

From the AP:

LOS ANGELES (AP) - The Los Angeles City Council has approved a one-year moratorium on new fast-food restaurants in a low-income area of the city.
The moratorium unanimously approved Tuesday is a bid to attract restaurants that offer healthier food choices to residents in a 32-square-mile area of South Los Angeles.
Councilwoman Jan Perry says residents at five public meetings expressed concern with the proliferation of fast-food outlets in the community plagued by above-average rates of obesity.
Nearly three-quarters of the restaurants in South L.A. are fast-food outlets. That's a higher percentage than other parts of the city but the restaurant industry says the moratorium won't help bring in alternatives.