Vegan diet, and root of B-12 deficiency

Some have told me that a vegan diet is basically unhealthy, that it leads to deficiencies, and the only logical reason to eat this way is martyrdom - to sacrifice my own health to prevent suffering to animals.

The first thought that comes to mind, is that human DNA is 99% identical to chimp DNA. A wild chimp's diet consists of 98% plants, with only 2% of insects and meat. Insects comprise the vast majority of this 2%, and then there are the fellow monkeys that the male chimps rarely hunt down and eat. So the modern human diet is deficient of insects. Although that's repulsive (to me) to think about, but, genetically, might essentially be what we were designed for.

Insects, actually, are very rich in B-12. Our b-12 supplementation, as vegans, was unnecessary when we were eating a mixture of plants and insects. See: http://entomofarms.com/deficient-in-b12/

Overall, here's an interesting article about wild chimp diet, which states that chimps eat meat 9 days a year, on average. They are considered "omnivores", but only eat real meat only a few days a year - most similar to a vegan who only eats meat on Christmas, thanksgiving and easter. https://blogs.scientificamerican.com/guest-blog/how-to-eat-like-a-chimpanzee/

Most wild chimps eat vegetables, fruits, leaves, bark, insects. A few days a year they eat meat. Some don't eat meat at all, getting their protein and b-12 from bugs. I guess we as vegans are very, very close to this ancestral diet. No wonder we feel better! Just found this interesting for you guys. Think I prefer the b-12 drops to eating crickets though!

TLDR: A vegan diet leads to b-12 deficiency because we eliminated insects, which our closest ancestral relatives (chimps) eat frequently. We did not evolve to eat meat except on the rarest of occasions, and sometimes never. Insects historically took care of our B-12 and additional protein needs.