As a person who has had to enter many different kinds of homes I have to say yes they should. I know that is one that will be debated again and laws may change but many who need assistance can't even cook there own food.
It is the children I don't want to see go hungry. And sad to say often times kids have to fend for themselves. I lived in an apartment complex once where this young kid would just walk in my door and ask for something to eat. I was a bachelor with not much food in the place and often sent her on her way with cookies and milk.
In the area in which I live, I believe it was around Hurricane Katrina that rules for cooked meals were changed as previously cooked meals were not an allowable purchase of this kind. As for junk food and energy drinks, they may be pushing it.
But if you draw a line at what cannot be purchased, where does that line stop? Our laws often seem too loose or too strict. Some lobbying must have been done on this issue to make these changes. There was also a underground market as most know where exchange for lesser cash value caused some changes. Good question, though.