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Some individuals never gain weight despite eating more due to a combination of genetics, metabolism, and lifestyle factors. One of the most important reasons is an person's metabolic rate. People with a higher basal metabolic rate (BMR) burn calories at a rapid rate, which means their bodies use energy more efficiently. Even when they consume too much calories, their body works to convert it into energy rather than storing it as fat.
Genetics also play a major role. Some individuals inherit genes that influence how their bodies process food & store fat.
These genetic variations can determine how efficiently our body burns calories or how resistant it is to gaining weight. For example, certain genetic factors can lead to an increase in the number of mitochondria in cells, which helps burn more calories.
Moreover, muscle mass can impact weight gain. People with more muscle tend to burn more calories, even while they are at rest. If someone has a naturally higher percentage of muscle mass, they may be less likely to gain fat, despite of their food intake.
Hormonal imbalances, such as thyroid disorders, can also affect metabolism for some. A hyperactive thyroid, for instance, can lead to rapid calorie burning, making weight gain more difficult.
At last, stress, physical activity, and sleep patterns can all influence how calories are used, further complicating weight gain for some individuals.
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