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Have you ever wondered why you lose weight… only to gain it all back? You’re not the only one — and it’s not a lack of willpower. It’s called the Set Point Theory, or the “defense of fatness,” and it’s been known in obesity medicine for over a decade. Here’s what happens: When you lose a significant amount of weight, your body senses that as a threat. Your brain says, “I don’t like this — I must be in danger.” In response, your metabolic rate drops, your hunger hormone (ghrelin) increases, and y