This poll, linked in the article above, is worthy of its own highlight:
http://www.gallup.com/poll/143696/Health-Disparities-Across-Incomes-Wide-Ranging.aspx
I had never heard of an urban food desert until I moved to New Jersey. My first personal experience with the lack of a grocery store far and wide came during a conference in Dallas, TX. I had flown into the city, was not about to spend money on a cab to go get some groceries, and what passed for public transit was unnavigable by a stranger to the area--and I had just spent eight years in Germany, using public transit to go everywhere, as far away as Austria, Switzerland and what was then Yugoslavia.
When I got back to NJ, I started looking around when I went to places like Camden and Philadelphia, wondering how on earth people got groceries if they didn't have cars. I discovered the bodega. These corner stores are not exactly sources of good basic food, shall we say gently, and the prices are outrageous.
I had no idea that a hungry person could also be fat. Guess what? Happens all the time in these areas. It's a travesty.