Weight loss is not just a test of willpower. The human brain has evolved to protect body fat reserves during periods of famine and food scarcity. Therefore, it may start to consider a previously higher body weight as the new norm – after losing weight, hunger and food cravings increase, and the body begins to use less energy.
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This biological “memory” may explain why so many people regain weight after dieting. It also helps to understand why drugs like “Wegovy” or “Mounjaro” help some people – they suppress hunger signals reaching the brain. However, when stopping their use, the effect may weaken, and the weight may return.
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