I spent 47 years trapped in the same brutal cycle. Lose 20 pounds on Weight Watchers. Gain it back. Drop 25 pounds on an 800-calorie diet. Watch it creep back on. Even tried HCG injections at 500 calories a day. Lost weight. Gained it all back plus more. Here’s what I didn’t understand: Every time I ate too little, my metabolism slowed down to match. So when I went back to eating normal food, my body stored everything as fat. I was literally training my body to gain weight easier each time. At 6