>Lee also notes in her study that, on closer inspection, food deserts don’t actually exist in the U.S., at least not as a national problem—on average, poor neighborhoods have more grocery stores than wealthier neighborhoods.
It's more likely that unhealthy food is the one source of pleasure that a poor person can afford, and with all the troubles of their lives, they may find solice in eating the delicious junk. Healthy food either takes a bunch of effort, or don't taste very good (unless you couple it with some expensive condiments/spices).
This is basically Scott Adams's "Pleasure Unit Theory", which I find very plausible: http://pratie.blogspot.com/2006/04/scott-adams-pleasure-unit... . If it's true, then developing healthy food that's convenient and tasty will do a lot more good than hectoring people about their bad decisions.
We can't fix everyone's problems. Hectoring may be bad, but at the end of the day a lot of change has to come from the people making bad decisions. Sacrifice for ones children should be the norm, otherwise they shouldn't be bringing them into such a suffering existence.