Some evidence seems to suggest that it could negatively affect brain health. (See deficiencies in B12, Iron and Zinc.) I've even read anecdotes of people that have gotten diabetes going all wholefoods vegetarian.
My belief is that our biology is complex and specific to each individual to the point where we can't all share the same diet and expect the same effects on our bodies.
> I've even read anecdotes of people that have gotten diabetes going all wholefoods vegetarian.
There can be a problem with reducing fat and protein significantly while using carbs for the majority of caloric intake. This can lead to diabetes. But you can do this on an omnivore diet as well.
My belief is that our biology is complex and specific to each individual to the point where we can't all share the same diet and expect the same effects on our bodies.