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There are many factors that affect the metabolism of the body, mainly genetic factors. Some people's small machines burn fat quickly, while others burn fat slowly. But age, weight, diet and exercise habits will also have a certain impact on the power of this small machine. With the increase of age, the metabolic rate will gradually decrease. Every 10 year, the human body will lose five or six pounds of muscle from the twenties. In other words, when you are 35 years old, you burn less calories every day 100 kcal than when you are 25 years old. This sounds worrying, but there are some simple ways to tap the body's fat burning potential.