The way I see it is can you survive in the wild with a vegan diet alone and no fortified food or supplements? I know you can survive and get enough nutrients from a omnivore diet with wild caught game and veggies, nuts and berries.
So thats pretty much why I go with my diet today, I don't eat much red meat though but I still do like 3 times a month max. I mostly eat salmon, chicken and eggs. I eat a lot of bean soup though.
Technically speaking, it wouldn't even be possible to be vegan in a high percentage of places.
People don't really understand that you cant find domesticated fruits and vegetables in the wild.
The tomato was once a small poisonous berry. The originating genus for a large number of domesticated plants are actually inedible or have to be processed heavily in order to be consumed.
There simply isnt the edible plant matter available in order to survive, especially in the harsh climates that humanity originated in and evolved from.
So, from this we can arrive at veganism being an unnatural diet for man and sort of a new age experiment. Only really being possible In the last 100 years with the advent and evolution of refrigeration, improved domestication, storage techniques and international shipping.
From what I've seen in the last 10 years, you can do veganism and be healthy. Up to a certain level. After a few years, vital reserves of unique nutrients and fats only acquired from animals begin to deplete and they start to have issues. With a few exceptions. Some genetics seem to do well on it for longer periods of time but they're more rare.
Back when Nick was fighting, a lot of athletes believed raw veganism to be the healthiest diet. But, theres a lot more information, data and experience on the other side of the spectrum now. More and more are realizing that it simply doesnt work. Especially for athletes.
I think a large reason why Nate was so thin and thrown around like a rag doll for much of his earlier career is he was eating predominantly plants. He even said that he was basically running on empty for years. That shift in diet and perspective is partially responsible for his resurgence at the end of his career imo.
That said, it does have a purpose and veganism can be a powerful cleansing and spiritual tool. Long term though, its suspect. Vegans are some of my best friends, ironically lol.
If you eat red meat, get it grass fed / finished and eat it raw. Underrated food. People are having success with the carnivore diet for a reason.