That is ridiculous. A vegan diet is a diet of deficiencies. Some collected notes:
https://docs.google.com/document/d/1hoG5ATcIqwxzvHktWywBJ7L_...
Maybe highly intelligent people don't want to erode their brains.
I am getting my blood tested regularly and all of my values are absolutely perfect. Sure if you're planning on eating only vegan junk food you're going to encounter deficiencies, but don't tell me it would be any different if you only ate at MC Donalds.
http://www.today.com/health/man-loses-56-pounds-after-eating...
Eight major food allergens – milk, egg, peanut, tree nuts, wheat, soy, fish and crustacean shellfish – are responsible for most of the serious food allergy reactions in the United States. Allergy to *sesame is an emerging concern.