Foods that have been around long enough that we some idea, possibly simply hermeneuticly, about their effects.
Shouldn't the unit here be the "diet", not the "food"? I mean, physically, what matters is what the body gets out of the whole collection, right?
Rob Rhinehart's food replacement Soylent now has a crowdfunding campaign.
If you're interested in one or more of these benefits, send in some money! There is also a new blog post.