One of the most persistent myths about metabolism is that it is the main factor determining whether someone will gain or lose weight. While metabolism does play a role in weight management, it is not the sole determinant. There are many other factors that can influence weight gain or loss, such as diet, exercise, genetics, and lifestyle habits
In reality, weight gain or loss is largely determined by the balance between caloric intake and expenditure. If you consume more calories than you burn, you will gain weight. If you burn more calories than you consume, you will lose weight. While metabolism can affect the number of calories you burn, it is not the only factor.