I don't care for the term "food desert". If you offer water in a desert people are over joyed to have it. There is plenty of real food available anywhere you go, people just choose the garbage. It is like being surrounded by clean springs and drinking Brawando the Thirst Mutilator by you own choice.
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That’s not my experience.
Just drove through the south US, and found most small towns having generally fast food. At restaurants, it became a running joke with the family that servers didn’t know what real butter is.
Where would you find the real food? The vegetables and grains will be laden with toxins, the meat will be fed the same. Seed oils and added sugar are ubiquitous.
What if I resigned myself to just eating the meat out of the fast food burgers? We are what we eat, and those animals are too. We’re consuming the toxins that they eat.