The human body is not a pneumatic system that you push food through. It has a nervous system attached to it which changes your mood in ways that affect both the

The human body is not a pneumatic system that you push food through. It has a nervous system attached to it which changes your mood in ways that affect both the intake (hunger vs. satiety) and expenditure (laziness vs. feeling energetic) sides of the energy equation. If you listen to people who have had success with low-carb and/or keto diets, their comments almost always discuss how the way they feel about food changed. They weren't hungry and they felt more energetic. Just about 0 of them mention spending time tracking calories consumed or measuring calories expended.