Yes, that's true, but it ignores many factors in the real world. Given a calorie rich diet your body can decide to pass it in your poop or absorb it. Given a

Yes, that's true, but it ignores many factors in the real world. Given a calorie rich diet your body can decide to pass it in your poop or absorb it. Given a fixed normal diet your body can decide to increase metabolism and decrease weight or decrease metabolism and increase weight. People, even in the same occupations, like say a mail man that delivers mail on food is on average much heavier than in decades past. Do you blame the food? Chemicals in the environment? Clearly there's a big shift that can't be explained just by more sedentary lifestyles.