So let me see if I got this. Obesity is caused by lack of readily available food...</liberal logic>
“Food deserts” are closely correlated with “hardware store deserts” and “liquor store floods.” Demand drives the market. People want merchants who sell $500 tennis shoes or open nail salons. If the demand was not there the businesses would go belly up. If the people in the “deserts” wanted healthy food and were willing to pay for it some enterprising Asian would be there to provide it.