Don't remember where I got this from.
Note the significant difference in time usage. What it says to me is that SNAP recipients, specifically mothers with kids, are time-constrained so they buy food which can be microwaved or is otherwise ready to go. Individuals who receive SNAP benefits have time to cook. Extrapolating, it means that SNAP mothers are feeding their kids more fast foods. My guess is that's less a "food desert" problem than a time scarcity problem.