>>27277
i did keto once, I felt miserable the first 3 days but then it did get easier, most people just give up and don't look any further into it but when you fast, you're unintentionally going into ketosis and once you start burning fat instead of the 25 hours of stored glycogen (from carbs) in your muscles, eating carbs at all while on a low calorie diet restarts this timer over and over and you are perpetually hungry and miserable because your body keeps switching between the energy source it really wants (glycogen) and the one it absolutely doesn't like using unless you refuse to eat (your fat stores).
So basically, fasting and completely abstaining from food is much easier than going on a low calorie fast unless you make a concerted effort to eliminate all carbs from your diet.
I wouldn't do this for more than a few days at a time, /fit/ likes to claim keto is utterly damaging to your body and makes you age a lot and lose your hair if you stay on it long enough, who really knows though, I haven't noticed that from doing 3-4 day fasts myself.