Comment by travis_brooks

I lived a vegetarian diet for over 30 years but eventually the effects of health problems caused by nutritional deficiencies were impossible to ignore. We evolved as omnivorous animals, to deny this history for philosophical reasons seems good and just for a while until the physical reality of our biology kicks in. If you can do a diet like this for 40 or more years without health problems you're better at it than I was, but I'm dubious that its very common.