> Given how little we know about digestion and the interaction between us and our gut flora I'd rather not limit the variety of my food based on the latest fad.
Some folks are saying that what we eat these days in western countries is indeed "the latest fad" - compared to at least what mankind ate 100'000-20'000 years ago. So, don't eat the latest fad - go back what your genome is used to. High protein?