Hunger is every less visible than most issues. One in 6 Americans can't afford basic healthy food, especially fruits and vegetables. (http://www.feedingamerica.org/hunger-in-america/impact-of-hunger/hunger-and-poverty/hunger-and-poverty-fact-sheet.html). Even when folks are on food stamps, virtually none get the 'full amount' (roughly $140 a month for an adult). Many who are in need have no access to stores that sell food at a discount, due to not having cars, due to living in food deserts, due to long expensive bus trips to get to such stores, due to living in rural areas, etc.
Would you know if your neighbors are hungry?
Most of the cheap foods are very high in carbohydrates, even the 'healthy' ones such as rice and beans. Which is a huge problem since the rates of diabetes among the needy are astronomical - and related (http://www.diabetesincontrol.com/articles/diabetes-news/10126-poverty-a-leading-cause-of-type-2-diabetes-studies-say).
Food banks, of course, are just as inaccessible, for the same reasons, as discount grocery stores are. And the food available at them is usually the same high-carbohydrate cheap foods noted earlier. Fresh and frozen foods are usually not available at all. Pasta, beans, rice - sure. Often canned tuna. Very rarely canned ham. Oh, did I mention the rates of high blood pressure and kidney disease among those in need? (http://thinkprogress.org/health/2013/07/30/2381471/four-ways-poverty-impacts-americans-health/).
Combine those facts with the lack of utilities (or total homelessness) noted in my previous blog. Cooking a pot of dried beans, when you have no electricity/gas, is ... an issue. Cooking a pot roast, even if you could grab a reduced price one, is a huge issue. So, sure, people are going to use their food stamps/scant cash to buy foods that don't need to be cooked or refrigerated. Lunch meat to be eaten that day. A quart of milk to have on cold cereal, rather than the far less expensive gallon of milk. Fast food. Etc.