That goes against all the convention ‘wisdom’ of the four food groups, food pyramid, etc. But its a very interesting thesis and I am wondering if there are serious studies to show that. I have a family member who decided to go vegan several years back and I think she has suffered immune issues as a result, or at least partially as a result of that decision. I have been gently trying to persuade this person to reconsider the vegan lifestyle for health reasons.