Because we're still running on cave-man hardware that wants to store extra calories in case of famine, conserve energy in case of emergency, etc. We haven't ad

Because we're still running on cave-man hardware that wants to store extra calories in case of famine, conserve energy in case of emergency, etc. We haven't adapted to the low-threat, abundant-calorie, instant-dopamine-button environment that we live in. It takes education and real discipline to do what is healthy instead of what our inner caveman tells us is good.