What part of the city do you live in that’s a food desert? They definitely exist, but I wouldn’t say they’re anywhere near common (especially relative the city’s staggering wealth disparities)[1].
This map is great and all but it's mostly worthless without actually going into the grocery stores and checking how the fruits and vegetables look. I live in Brooklyn but it's pretty well known that good quality fresh produce is not easy to get in the city, especially not for cheap, if you compare with other cities. You have to join a CSA or make the trip to chinatown or something like that, which is just not an option for a lot of people.