Some calorie measurements are done via bomb calorimeter- you measure before eating, and then, er, after eating, and subtract the difference. So the inefficiency

Some calorie measurements are done via bomb calorimeter- you measure before eating, and then, er, after eating, and subtract the difference. So the inefficiency of poop can be baked in. https://arstechnica.com/science/2016/01/why-the-calorie-is-broken/ https://arstechnica.com/science/2016/01/why-the-calorie-is-b...