Body mass index (BMI) is a number obtained by dividing the kilograms of weight by the square of the meters of height. It is a widely used international standard to measure the degree of obesity and health. Mainly used for statistical purposes, when we need to compare and analyze the impact of a person's weight on the health of people of different heights, the body mass index value is a neutral and reliable indicator.

Waist-to-hip ratio (WHR) refers to the ratio of waist circumference to hip circumference. Waist circumference reflects the comprehensive index of total fat and fat distribution, while hip circumference reflects the development of hip bones and muscles. The greater the waist-hip ratio, the more fat may accumulate in the waist, abdomen or internal organs.