I get what you mean. you essentially are talking about a cheat meal right? somewhat of reward, or dose of happiness in sorrow. Problem is that oreo (for example) are what i would like to call bandaid on a gun wound in this situation. it is not really going to help, them, and all they get is a sugar high. Instead, if they are given a apple, with similar or higher sugar content, it still gives sugar, but has fiber and some vitamins.

Your pointt on food not spoiling is very valid, and they would have to decide what is the optimal food which is reasonably shelf stable.