If your eating habits are truly narrow, consider supplementing with multi-vitamins so you don't short yourself on important things like B vitamins (we would actually die without them), and all the lipid-solubles, A, D, E, and K. In fact... If I remember, I'll get you my list of essentials, and where you find them. Straight from Biochem, so it should be a bit more reliable than some website.
