Funny anecdote, my fiance used to live in midtown Detroit near the Whole Foods. At the time the groceries situation was worse, it was more-or-less a food desert other than that Whole Foods [0].

I don't know how folks who can't afford a car would get groceries (an hour round trip on the bus, I guess), but that can be said about nearly everything in Michigan. The whole wealth bootstrapping problem is really unsolved out there, you can't get started on anything without like $5k for a car and car-related expenses.

[0]: https://www.google.com/maps/search/midtown+detroit+groceries...