I think keto is (in most instances) a dangerous fad diet, but feel free to experiment. Tho I have at various times cut sugar and processed carbohydrates (only eating whole grains) out of my diet and everything was sweeter.
Fasting and keto are not the same thing.
I never said that fiber needs are different. I said that fiber works for some people but not for others. I should have specified better. What I meant is that apparently while many if not most people feel satiated from eating fiber, others don't. I.e. it does not help them feel full. You still want to eat a good amount of fiber for other reasons, such as having enough "bulk".
I never said keto and fasting were the same. I drew a link between some of the benefits that I saw from going keto and some of the benefits of fasting.
I am interested though to hear more about why you say it is a dangerous fad diet. I think you're definitely are onto something, if I interpret correctly but I don't want to mis-interpret. I say that because I see a lot of "keto bomb", "keto bar", keto this and keto that pre-packaged food popping up in the grocery stores. I wouldn't trust any of that either. There's also a lot of fluffy and shiny info out there on the internet about it. As with any topic really, one has to be careful while doing research, especially if someone wants to sell you something.
ETA: this isn't about "feeling full" or "bulk" this is about how the body processes food, and extracts energy using bacteria, who feed on fiber in our diet. google "fiber gut bacteria" for what I'm talking about