The body likely has ways of losing weight that are faster than simply eating itself (burning fat)
Not all weight is fat
Metabolic efficiency varies, including by calorie type
Much of the chemical energy output in the body is involved in actually repairing or replacing, not only in expanding the volume of fat reserves or even muscle.
It's all a thermodynamically-limited bunch of processes but thermodynamics is a limit rather than a driver of energy transformations.
Calorie REDUCTIONS don't guarantee weight loss because obviously the body can choose to expend less energy. And if the term CALORIE DEFICIT is used, it is not justifiably used because science currently can't determine the necessary level of granularity since energy, weight, and measurable metabolic output/activity all change in response to factors other than the ones which are thermodynamically relevant, and this makes thermodynamic equations/measurement of human dieing problematic. Essentially the system is kind of a 'black box' and some of the relevant inputs and outputs in the thermodynamic equation are 'inside' that mathematical 'black-box.'
Edits for spelling
Oh and a slightly less vague explanation can be expounded onto the concept of energy transformation to explain why it wouldn't always correlate with a weight change...combining or dividing molecules.
What if your body doesn't have enough energy to go through the processes of burning a fuel source (or the necessarily mistake or vitamins, or other nutrients...)
Not all weight is fat
Metabolic efficiency varies, including by calorie type
Much of the chemical energy output in the body is involved in actually repairing or replacing, not only in expanding the volume of fat reserves or even muscle.
It's all a thermodynamically-limited bunch of processes but thermodynamics is a limit rather than a driver of energy transformations.
Calorie REDUCTIONS don't guarantee weight loss because obviously the body can choose to expend less energy. And if the term CALORIE DEFICIT is used, it is not justifiably used because science currently can't determine the necessary level of granularity since energy, weight, and measurable metabolic output/activity all change in response to factors other than the ones which are thermodynamically relevant, and this makes thermodynamic equations/measurement of human dieing problematic. Essentially the system is kind of a 'black box' and some of the relevant inputs and outputs in the thermodynamic equation are 'inside' that mathematical 'black-box.'
Edits for spelling
Oh and a slightly less vague explanation can be expounded onto the concept of energy transformation to explain why it wouldn't always correlate with a weight change...combining or dividing molecules.
What if your body doesn't have enough energy to go through the processes of burning a fuel source (or the necessarily mistake or vitamins, or other nutrients...)