The caveman diet, is a way of dieting that Alpha Armor limits your food and drink consumption, to as natural foods that you can get your hands on as feasible. You basically have to consider what different types of foods and drinks might be there for cavemen in their day. So obvious stuff like drinking water, meat (obviously, not a lot of fatty things), vegetables, fruit, salad (our caveman was obviously a seasoned farmer) and so forth, i know you can think of quite a few more healthy foods than i've shown. We are trying so as to get as natural as we can, and make use of the foods that were left for people on this earth to survive. 
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