I feel like we do not know the answer 100% for sure. But from what I know eating vegan is totally safe if you watch your micro nutrients. ---- Speculation bel

I feel like we do not know the answer 100% for sure. But from what I know eating vegan is totally safe if you watch your micro nutrients. ---- Speculation below ---- (corrections and comments welcome) Doing double blinded control trials with diets over the long term is impossible, and there are so many confounding variables with diet study. Also, as Peter Attia likes to talk about, there is a lot of variation from person to person. I follow Rhonda Patrick and Peter Attia, and it's very interesting to hear what they have to say, and they are clearly smart individuals who are consistent, and really try to do their best with looking at diet. Also, I trust their intentions and the way they approach these problems, unlike certain other people. (I believe consistency is one of the best ways to point out issues in the way someone evaluates evidence, and to now use them as a reference source) I think part of the issue comes down to if you want to be on the cutting edge, you have to take risk, because at the leading edge there isn't enough evidence to be 100% sure. It's interesting to see vegans and keto type people degree with each other, because it shows two group of people who are convinced their way is best. Things that are popular right now seem to be keto, vegan, various forms of fasting, and omega 3. Peter Attia likes to talk about keeping blood sugar, and therefore insulin low, which I think has a good amount of evidence behind it, but good luck getting a continuous glucose monitor. I think we can pretty much all agree on avoiding too much red meat, processed foods, and sugar is generally going to get some of the largest results. There is also a lot of talk about fasting. It seems like eating in a smaller window is best, but at the same time we don't 100% know. If I were trying to eat an optimal diet, I think I'd side on the low sugar (and trying to minimize blood sugar), lots of plants, a little bit of meat (not much red meat), eating within a small window, low mounts of (or no) alcohol. We are becoming aware of the many issues with scientific studies, and dietary studies may be some of the worse. Additionally, things that we discover on mice (and other animals) often don't translate to humans well. I think with a vegan diet you have to be careful that you are getting all your nutrients, but I haven't seen much evidence against it. Some notable vegans include Alex Honnold (Free Solo, first person to climb El Capitan without a rope and harness), Clarence Kennedy (insanely strong weightlifter, freak of nature; he does steroids, but still is extremely strong given his body weight), Scott Jurek (one of the fastest people to complete a 2000 trail, Appalachian Trail). These are people at the extremes of performance. I think at the end of the day it depends on how much risk you want to take, and how much time you want to invest in this. At some point you can spend more time optimizing your diet than the gains you get from those things. Also, individual variation can be huge between the way ones body processes things.