Cmon now, the body doesn’t fuel itself with air. You surely understand our biology better than to believe this.
surely everyone knows you expend energy by simply being. Thay energy comes in the form of cals consumed, be it food or drink.
if we don’t consume enough to fuel ourselves our body burns its fat or muscle stores to make up the defecit.
this in turn makes us weigh less.
i think you’ve got confused possibly in the old starvation mode myth, or thinking our metabolism slows right down to only survive on cals consumed.
let me explain, the starvation mode myth is something that exploded and is erroneous, it was taken from a trial done on humans, I think in Switzerland, can’t recall,
people were starved. As in properly starved, zero food.
their metabolism slowed right down due to it.
their bodies continued to lose weight at the expected rapid loss.
because, and go back to the start, our bodies cannot fuel itself with air. It is either what we consume, or it is fat or muscle.
think logically, have you ever seen a fat anorexic?