Earlier quoted context omitted.
There are people who have averse reactions to almost every plant based food, and can largely only eat meat or suffer horrible mental and physical health problems. Diet is not one-size-fits all, and we have basically no idea how complex diet is, or the specific long term effects of most dietary interventions on people. It is absolutely reprehensible to represent going vegan as an obvious way forward when it is unclear…
Can you link to a description of that condition? It sounds fascinating.
In addition, many people are unable to eat yeast or yeast extracts, which are among the few commonly available non-flesh sources of the crucial vitamin B12.
[0]: http://mikhailapeterson.com/2017/12/18/zero-carb-carnivore-d...