Possibly just a bad choice of language, but does to some degree indicate where you are coming from, there is no creature on earth that has a Vegan ancestry, this philosophy is a modern human construct and has no relevance in a nutritional dietary discussion.
Originally Posted by JenniferCampbell
Nature has Herbivores, Omniovores, Carnivores and a few subgroupings, but no Vegans.
Humans seem to have evolved to do well on eating somewhere between low meat/high veg to high meat/low veg, makes sense as food supplies were constantly variable, you need to find what suits you best.
If you are making food choices based on animal welfare philosophies, that's fine, but be aware that you are doing this which means you are choosing to limit your health options because of beliefs, don't fall in the trap of trying to justify your choices through convoluted nutritional science.
Personally I try to choose health as much as possible with diet and lifestyle, and probably sit in the 60-80% Fruit & Veg range, though I have also been known to eat an entire roast chicken + all the trimmings in a single sitting, I generally go with the flow of what my body calls for, but there is rarely enough fruit & Veg on offer when I go out.
"There are no short cuts to enlightenment, the journey is the destination, you have to walk this path alone"