[argella]

"When you say this do you mean "we have to look for the underlying causes of calorie imbalance" or do you mean "the human body is capable of materializing mass out of nothing"?"

when you say this, you reveal your ignorance of the biology that makes it far more challenging for some people to "eat less" than others, and that changes their metabolism to combat the weight loss if they do happen to "eat less" for some time.