> Wish I could find that study! But it would be an interesting hypothesis to test for: if someone reduced their calorific content too quickly then the body will attempt to compensate when normal eating resumes. Obviously it would need to use animals and a control group but it might be insightful.

There's a natural experiment of sorts in re-feeding people with anorexia. Many people think this is a risky time because they think it's easy for someone to gain wieght too rapidly.

(I'm not talking about the related, but different, "refeeding syndrome" https://en.wikipedia.org/wiki/Refeeding_syndrome)