Weight loss on ketogenic diets in humans is likely due to reduced calorie intake and increased fat oxidation disproportionate to baseline, driving up energy expenditure.

“I suspect the answer is both in other words if you do the latter the former should happen so when people say why do you eat less on a ketogenic diet the question is really or the thinking would be are you eating less because you are basically eating yourself more because you're obviously oxidizing all of those fatty acids to make BHB or is it some other reason that you know has to do with the neuro chemistry of these things that go beyond sort of the metabolic central pardon me peripheral effects of it”