The body fat rate in human body will be affected by age and gender and vary. The standard body fat rate for normal adults is 15%-18% for men and 25%-28% for women respectively. Body fat is an important substance in human body, too much body fat will cause obesity, too little body fat will cause wasting, too low or too high body fat rate is not good. If the body fat rate is too low, it will affect the synthesis of calcium elements, which will cause osteoporosis and even rickets in the human body. The impact of low body fat rate on adolescence is especially serious, and low body fat rate will affect stunting in adolescence. High body fat rate can easily cause obesity, which can lead to diabetes, abnormal liver function and cardiovascular disease. High or low body fat percentage can cause loss of bodily functions and requires active treatment measures.