this map shows smaller food deserts in the summer, when farmers markets are open. I find the new graduate student focus on farmers markets fascinating. It seems since so many probably grew up with the latest iterations, they assume their longevity. Glad of that.
Not sure its news that food deserts shrink when markets are open. Although, if it helps officialdom realize that we open farmers markets where they are needed, it could help.

I do prefer the Diego Rose (Louisiana Public Health Institute) definition of “food swamps” rather than food deserts to be more descriptive usually. Meaning areas swamped with bad food, rather than no food.

Map