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.