I think you are entirely misunderstanding my point. What about this study suggests that, for a healthy adult in 2018, adhering to an entirely/strictly keto diet is necessary or even the only optimal diet for cognitive and/or physical function? I’m not arguing evolution and how we needed nutrient/calorie dense foods due to our large brain size relative to even apes and other mammals, only what the implications are for us today, sitting at our computers typing these comments up. My only point is that, in 2018, a keto diet is not a panacea for all man’s ailments, and is not the be-all-end-all for improving cognition or improving body composition. What in this paper suggests that if I have a bowl of rice with my ground beef and vegetables I will suffer cognitive deficits? I plan on eating multiple times a day for the foreseeable future, so I’m not really too concerned with needing to eat multiple times a day to fuel my brain. Hell, we’re on a largely fitness oriented website; I’ll eat several times a day to get those MPS spikes either way.
TL;DR: I’m not saying keto is bad or wasn’t evolutionary useful, only that it’s not a “magic diet” that will inherently serve as the best nootropic there is, get you shredded and jacked, and cure all of man’s ailments as some people claim.
Edit: there is also research suggesting that while keto may be good for maintaining muscle while losing fat (like IF is), it really doesn’t seem to be the best for actually gaining muscle. That alone is sufficient reason enough for me to not adhere to it. To each his own though, and not all of our goals are the same. But we’re getting off topic a bit now.