That's most interesting Mr Red. My niece is a strict Vegan and has recently had problems with her stomach and liver. I wonder if choline deficiency could be one of the causes.
I see from your article that hen's eggs are a rich source of choline, which is good news as I like eggs and eat two or three a week.
I do feel we were meant to be ominivores (our dentition and digestive enzymes would indicate this)

I now have that Dolly Parton song playing in my head: "Choline! Choline! Choline! Choliiiiine!"