The commonly used body mass index (BMI) is also translated into BMI. This is an index for calculating height and weight. The specific calculation method is to divide the weight (kg, kg) by the square of the height (m, m), that is, the body mass index = weight/height/height (kg/m2). Research shows that the body mass index of most individuals has obvious correlation with the percentage of body fat, which can better reflect the degree of obesity.

According to the analysis of the degree of obesity by body mass index, the critical value of body mass index of the World Health Organization (WHO) is usually adopted internationally, that is, the body mass index of 25.0~29.9 is overweight and over 30 is obese. The China Office of the International Society for Life Sciences organized the China Obesity Working Group composed of multidisciplinary experts, and collected and analyzed the relevant data of 240,000 people in 23 provinces and cities in China, including body mass index (BMI), waist circumference, blood pressure, blood sugar, blood lipid, etc. Based on this, the body mass index standard of China people was put forward, with "24" as the limit of overweight and "28" as the limit of obesity. The limit of abdominal fat accumulation is male waist circumference ≥85 cm and female waist circumference ≥80 cm.