BMI means body mass index, which can be calculated by the formula of weight and height to assess whether the body is in a healthy state. Body mass index is ≥28kg/m^2, wasting body mass index is <18.5kg/m^2. body mass index can reflect the body condition to a certain extent, but can not accurately describe the distribution state of body fat, more muscular people may be higher, but does not represent obesity, so it is easy to misjudge the health status, can be based on the following ways to comprehensive testing: 1, ideal weight: according to the male and female body condition is different, it can be divided into male, weight (kg) = [height (cm) - 80] × 0.7; female, weight (kg) = [height (cm) - 70] × 0.6. normal ideal weight ± 10%, such as more than 10.0%-19.9% is overweight, more than 20.0% is obese; 2, waist circumference: the subject should be in the standing position, feet apart 25- 30cm, weight evenly distributed, and the midpoint level of the line connecting the anterior superior iliac spine and the lower edge of the 12th rib was measured. The normal waist circumference is usually <85cm in men and <80cm in women; 3. Waist-to-hip ratio: hip circumference measures the circumference of the most prominent point of the pelvis surrounding the hip, and compared to the waist and hip, it is usually <0.9 in men and <0.85 in women; 4. Other: triceps skinfold thickness can also be measured, body density measurement method, bioelectrical impedance measurement method, or select imaging examination in CT, MRI, etc. The body fat content can be determined in a comprehensive manner to assess the health status of the body. For example, if you are obese, a light diet and moderate aerobic and anaerobic exercise are recommended. In case of obesity, a light diet and moderate aerobic and anaerobic exercises are recommended. In case of leanness, an increase in diet and nutrition and moderate muscle building exercises are recommended.