Peak aerobic performance requires carbohydrates. But most people expend less than 100 calories a day on peak aerobic performance, not 5000.
Carbohydrate-related hormones feel pleasant. Withdrawal is unpleasant. This is a good motivation for a hunter-gatherer, but not so much for someone with an unlimited supply of carbohydrates.
Carbohydrate-related hormones feel pleasant. Withdrawal is unpleasant. This is a good motivation for a hunter-gatherer, but not so much for someone with an unlimited supply of carbohydrates.