Ancestors ate lots of carbs but they did many heavy chores that would be the equivalent of a ketogenic diet (e.g. like the high carb Okinawan’s) but the level of activity required to eat a high carb diet and be ketogenic is not something modern people can do easily that’s why they cannot figure out why nothing happens when they try to put carbohydrate intake under a microscope and restrict without increasing.
The more you exercise (lifting weights, resistance training etc.) on a ketogenic diet the more your mimicking fasting or caloric restriction and amplifying what your doing in twice 2x the increments and you end up burning muscle rather than body fat and your skeletal muscle volume gets smaller and you start looking fatter rather than muscular.
It is very important to realize you can restrict calories especially carbohydrates but that is all you will ever be able to do unless you gain muscle mass and the only way to do that is eat a higher balanced amount of calories and be more active so you can eat more carbohydrates as you gain skeletal muscle volume.
People who try to lift weights, running, exercise etc. and fast or restrict calories are wasting there time and damaging there metabolism even more.
This keto meme (below) is so wrong because it does not work like that.
I could show a person how to burn up all the glucose in their blood stream and glycogen in muscle tissue on a high carbohydrate diet and be back into ketosis in a hour to a half hour but would they be capable of doing it (probably not) and would they strictly comply?