homeless and starving and all the food shelters ran out of food to give you, what would be the cheapest food you could buy that you can live on for months at a time and not be malnuourished? Rice or some other wheat?
By cheap I mean price per caloric nutritional quality value density.
Canned baked beans in tomato sauce. Can be eaten cold, very high in protein, the tomato provides vitamin C. Low in fat, high in fibre. No food is perfect but baked beans come close. :) A little high in sugar, but that's just energy, you'll need it.