Hunter-gatherers didn’t Intermittent Fast so much as they just didn’t eat 3 meals a day or even eat every day. Why? Because they didn’t need to. Neither do we.
I’ve been skipping a morning meal for about a year now and find it easy to do. I also eat a very low-carb diet. IF has helped me lose 175 pounds--effortlessly.
Three squares of a high-carb diet are great for the food and pharmaceutical industries, but not so good for many people.