My SIL’s family was vegetarian, her middle daughter became malnutritioned.
I haven’t met a healthy vegetarian yet and I don’t even know a vegan.
I worked with one vegan and he was about as fat as I am and he tended to get sick more often. He said he was a vegan because it was healthier but he didn’t seem to be any healthier than I was then and am now.
My former boss’ daughter was a vegan. She was also editor for Cornell’s paper, Turn Left. LOL
“... middle daughter became malnourished”.
My friend’s daughter went through a vegetarian/vegan phase for about 18 months. Believe it or not, her pediatrician supported the idea. Even with vitamins and added protein, her hair started to fall out, her skin was constantly broken out and she looked horrible. She gave it up after 18 months and now looks fabulous.
My younger son (the architect) is vegetarian but also eats seafood, dairy and eggs. He's in pretty good shape; it doesn't appear to be harming him- yet.