Calories are all bullshit. CICO is useful when everyone more or less eats the same diet. But 100 Cals of bread is not 100 Cals of steak. Not by a long shot. We do not burn food for heat. We are not bomb Calorimeters. Out metabolism is hormonal and chemical. I switched to Carnivore 5 years ago. I was eating I shit you not like 4k Cals a day and still lost adipose tissue. My bone density, soft tissue, organs and muscles were building up from all the extra collagen and protein. I was growing hair at 40 in places I didn’t have it before. Eventually I naturally went into OMAD and eating less but “science” has nutrition all wrong. Entirely. Most of the shit is based on self-reported data and is useless for evidence based medicine. Our body runs on fat. Cholesterol is the most important molecule the body uses. And out appetite is hijacked by carbs which just store fat.