Think Nate hits the nail on the head.
If your body adapts why doesn’t it do that for the victims or famine or the sufferers of anorexia?
It doesn’t significantly. Yes your BMR decreases but for the same reason that a mini needs less petrol than a humvee.
What however changes when people lose weight is that they reach their goal and they lose focus. A lot of the time they see amazing results and their social life increases and that leads to increased calorie intake.
There is clearly no clear way for Nate’s issue two but its very clear that the solution to number one is caloric deficit however you want to get there.
What I never understand is why people who cling to one route over another whether its keto, IF, paleo or vegan when totally disregard any other.