Yeah, one meal a day, mostly meat/eggs is what I do. But different people have different metabolisms.

Going long periods without eating pretty much requires keto adaptation. If your body’s cells are not adapted to burning fat for energy, they’ll be looking for glucose that won’t be there, which can cause lethargy, etc.

I first started hacking my diet with going keto before intermittent fasting. At that time I made myself the following rules:

- no more than 20g carbs a day

- except Saturday (cheat day)

- eat as much meat/eggs/cheese as I wanted

I would crave sweets, but remember that Saturday was the day for it. Change “won’t” to “can’t”. That is “I can’t eat that today because it’s not Saturday.”

After a while, keto became my norm and I didn’t need the cheat day anymore.

Years later I read about the Fast 5 Diet and Lifestyle. Intermittent fasting with a 5-hour eating window. First thing I did was skip breakfast. Then pushed lunch back and back until I was skipping that too.

I found the switch to intermittent fasting to be not so difficult, but I attribute that to the fact that I was already keto adapted.

If you want to know more about keto adaptation, macro nutrients, insulin etc., I recommend books by Gary Taubes. Either “Why We Get Fat” or “Good Calories Bad Calories”.