The reason it doesn't work is the same reason you can't take a 40 year old moron and turn him into a genius. It takes willpower and self discipline to maintain a healthy lifestyle. Most people don't have it. Teaching it is almost impossible. People 100 years ago didn't have willpower or self discipline either. They weighed less because there was no McDonalds or Dunkin donuts next door. All the food wasn't saturated with sugar. Today you have to very carefully with what you buy. They sneak sugar into everything to get you addicted. Your willpower is constantly tested. Willpower is basically a finite resource, eventually you will break. 100 years ago you worked on a farm, working out today is optional. You have to goto the gym.
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