This nuance you're adding is not optional or dismissable. It's essential complexity to solving the problem. Calorie in calorie out is not false. It's just not

This nuance you're adding is not optional or dismissable. It's essential complexity to solving the problem. Calorie in calorie out is not false. It's just not useful. Like saying to go to the moon you need to go up. Calorie in is appetite. Calorie out is metabolism. The specifics of how these are affected, and the solutions to fixing them, are a lot more fruitful than reaffirming the second law of thermodynamics.