alt Hacker News> I mean protein does fill you up faster and better with fewer calories which is good for weight loss or management.
Thank you for exemplifying the problem so clearly - conflating protein with fat when we're really talking about a simple carbohydrates issue of high energy density with negative satiety.
Excess protein is excreted renally, it's easy to overdo and can cause serious problems.
https://en.wikipedia.org/wiki/Protein_leverage_hypothesis
Protein is actually pretty hard to overdo naturally. If you've ever tried to follow the high protein guidelines and you're a taller or broader shouldered person you'll find that getting that amount of protein requires supplementation or a lot of focus on lean meats. I'm not saying everyone needs to go "high" protein, I'm just saying that worrying about the amount of protein you're eating is probably not worth doing. You'll feel pretty full if you eat a lot of protein.
Keto is not just "high fat" though. Keto is about producing ketones, and going too high fat can actually be counterproductive there, at least for weight loss. (You want to be liberating fat from your storage, not getting it from external sources)