Body Mass Index, abbreviated as BMI, is an indicator to estimate whether you are obese or not by using your height and weight, and the common formula is BMI=Weight (kg)/Height (m)^2. According to China’s standards, the wasting body mass index is <18.5kg/m^2, normal body mass index is 18.5-23.9kg/m^2, overweight body mass index is 24.0-27.9kg/m^2, and obese body mass index is ≥28kg/m^2. Body weight is one of the important symbols to reflect and measure a person’s health status, too fat and too thin are not conducive to health, and height and weight incongruity will not give a person a sense of beauty. Changes in body weight will directly reflect the long-term caloric balance of the body. Through the calculation of standard weight, it can reflect whether the body’s weight and height are in the normal range, and at the same time suggests whether there is an abnormal body condition, which can provide an effective reference for the next stage of diet and exercise. However, since body weight includes the weight of muscle and fat, it is not possible to judge health based on standard body weight alone. If you want to know the proportion of muscle or fat and other substances, you can use further body composition measurements to judge the health status of your body.