Anyway, returning somewhat to the topic, more middle-class white people live in "food deserts" than minority poor people. This is because the many supermarkets of the past decades have been replaced by a few 'big box' supermarkets, so everyone has to travel some distance to get to one. So, the 2.3 million number refers mainly to minorities, whereas the actual figure is many times that. For example,
"Data from 2015 show that 10% of Wisconsin, or about 570,000 people, live in areas meeting the standards of a food desert, according to the U.S. Department of Agriculture."
Most of these would be middle class white people.