Because the body mass index does not take into account a person's fat ratio, a person with an overweight body mass index may not actually be obese. For example, a person who practices fitness will have a body mass index of more than 30 because of his heavy muscle weight. If their body fat rate is low, they don't need to lose weight.

Fitness people do not use the value of body mass index to calculate, and others do not use this value:

1,1under 8 years old; ?

2. athletes; ?

3. I am doing weight training;

4. Pregnancy or breastfeeding;

5. frail or sedentary elderly people.

Extended data:

Body mass index is mainly used for statistical analysis. The absolute value of weight can't be used to judge the degree of obesity, and the degree of obesity is naturally related to height. Therefore, the body mass index (BMI) obtains a relatively objective parameter through the two values of human body weight and height, and measures the physical quality by the range of this parameter. The calculation formula is:

Body mass index Body mass index = weight/height squared (international unit kg/㎡)

Ideal body mass index (18.5 ~ 23.9) = weight (unit Kg) ÷ square of height (unit m) According to the standards formulated by the World Health Organization, Asians are overweight if their body mass index is higher than 22.9.

However, with the development of science and technology, the current body mass index value is only a reference value. In order to truly measure whether a patient is obese, it is necessary to measure the patient's impedance by micro-electricity, so as to infer the patient's fat thickness. Therefore, the role of body mass index has gradually changed, from medical use to mass weight loss index.

Baidu Encyclopedia-Body Mass Index Value

Baidu Encyclopedia-Body Mass Index