A lot of self improvement's health & performance advice is based on trying to be more like our ancestors. But in my opinion, it's not valid to base all your opinions on that, though a good thing to tap into. Here are my thoughts 1. (Should) They actually didn't die that young. A lot of anti-ancestor health people will say that because they died so young, we shouldn't want to be like them. The average life expectancy in the stone ages was 35. BUT that number is so low almost solely because of infant mortality. If you remove death at birth from the equation, they actually lived to ~70. 2. (Shouldn't) There environment was not the same. Because nutrition, sleep, etc are so complex, there are a lot of variables at play. One single thing in the air could throw all of it off. And fuck is our world different. We have all this shit like mold in our houses, heavy metals in our water, plastics in our clothes, and all this other stuff that's killing us. Also think of all the sickness in our world. Were our ancestors having problems with 'genetic' obesity or diabetes? no. For example, I have an autoimmune disorder called PANDAZ. It's caused by exposure to toxic mold (indirectly, your doctors won't tell you this). And because of this disorder, I can't eat eggs, gluten, or cow's milk. Like the fuck? Another great way to showcase this is all our bluelight and technology, + EMFs. We can't sleep right anymore which fucks up everything. And EMFs cause all sorts of problems in your brain & body. Now, I know all of this kind of seems vague, but it's really complex and hard to connect/explain. What I'm trying to say is that all of these things that we're exposed to affect all of our body's systems. 3. (Should) They evolved to do well with their conditions. I don't know a ton about evolution, though it'd be really interesting to learn. But it's obvious that if they had access to only certain foods, they would evolve to do well with them. If our ancestors only ate deer and berries, they'd probably find the most efficient way to absorb those things. And those who didn't digest those optimally, well they died.