Oh same here. Anytime I tell people I do keto, or IF, they lose their minds. The good thing is that I’ve always done my own thing without regard for what others think (hopefully within reason).

What you found is exactly how I feel daily. By sticking to keto, that loss of focus is minimized as less energy goes to my gut for digestion.

IF makes sense. You will be hungry later whether you eat now or you don't. Keto, I'm not so sure about.

When I did keto, the biggest thing for me was that while I eventually got hungry, it wasn't like one of those "gnawing at your gut" types of hungry. It was very mild. Problem with keto for a lot of people is that they don't consider the problems that a lack of soluble fiber in their diets can cause. I love salads and pickled veggies so it wasn't a big issue for me (I also ate some chia seeds once a day), but others would probably have issues.

> I was very focused for some reason.

Maybe because it was time to hunt... :P

I've been doing IF for almost a year, and I don't consider it a diet anymore. I consider it my new way of life. I was absolutely blown away with the increase in energy I got when I started doing the fasts. I do 3 24 hr fasts a week, and on non-fast days I usually have dinner and either lunch or breakfast.