The Paleo diet, like all fad diets, is predicated on unproven notions (I said unproven, not false...) about what's good and bad for us. You're not supposed to consume wheat, barley, oats, beans, peas, milk, cheese or spuds, among other things. Cavemen didn't have them so we're not adapted to them, and that causes problems, so they say. A non-Paleo diet can lead to heart disease, obesity and heart disease, we're told. That conveniently sidesteps the fact that in those nasty and brutish times you generally didn't live long enough to get all that stuff. I looked up a piece on the Paleo diet on the Mayo Clinic website. Included in a suggested menu are cantaloupe melons and avocados. Clearly both part of the staple diet of those Palaeolithic chaps... :-)