When body weight is reduced by 10-20%, energy expenditure decreases by more than predicted by body size loss alone, suggesting a metabolic adaptation.

“if you reduce the body weight of a human by 10% 20% you get a reduction in energy expenditure which is greater than what you would predict from the loss of just body size or that there in other words their metabolic rate didn't reduce just to support the new reduced weight it reduced even further which would almost try to return them to it yes of your weight right so they had a disproportionate reduction in energy expenditure”