In the U.S., rich people tend to eat a lot healthier than poor people.

Because poor diets cause obesity, Type II diabetes and other diseases, this nutritional inequality contributes to unequal health outcomes. The richest Americans can expect to live 10-15 years longer than the poorest.

Many think that a key cause of nutritional inequality is food deserts – or neighborhoods without supermarkets, mostly in low-income areas. The narrative is that folks who live in food deserts are forced to shop at local convenience stores, where it’s hard to find healthy groceries. If we could just get a supermarket to open in those neighborhoods, the thinking goes, then people would be able to eat healthy.

The data tell a strikingly different story.
https://theconversation.com/eliminating-food-deserts-wont-help-poorer-americans-eat-healthier-127295