Many people link obesity to personal willpower: “Just eat less” or “It’s personal responsibility” are common views. But experts say losing weight is not that simple. Many patients struggle to control their weight even when they are active and eat healthily.
The causes of obesity are complex. Some genes control hunger and fullness, and metabolism speed varies for each person. Therefore, people who eat the same amount of food gain or lose weight differently.
The body tries to maintain a certain weight. If weight drops, hunger increases and metabolism slows. That is why relying only on willpower to lose weight often fails and leads to yo-yo dieting.
Environmental factors are also important: fast food, sugary drinks, advertising, and large portions encourage people to eat more and move less. Therefore, understanding obesity requires considering genetic, biological, and environmental factors together.
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