If a person is 150cm tall and weighs 60kg, he is obviously a little fat. The value of body mass index can reflect a general trend, allowing people to monitor whether their bodies are too fat or too thin.
The full name of body mass index is body mass index, and the calculation formula is weight (unit kilogram)? Height 2 (unit meter). Generally speaking, the values between 18.5-24.9 belong to the normal range, and are differentiated according to different races. The upper limit for Asians is even lower at 23.9. There is also an optimal range in the middle, which is 20-22.
But the body mass index also has its limitations. For example, there is no gender difference, which can not reflect the muscle content well. In addition, for the elderly and children, the results will be somewhat biased.
So the body mass index is only a rough measure. If you really want to know whether you are healthy or not, you have to look at many parameters such as body fat and girth. For example, a girl who is not fat herself may find that she has not lost weight after a period of fitness. However, if you measure the thigh circumference, you will find that it becomes smaller and the visual effect becomes thinner. Therefore, it is meaningless to look at weight and body mass index at this time.
In addition, a group proposed a more scientific physical index called. Relative fat mass index? (RFM). The formula for male is 64-(20? Height/waist circumference), the result is greater than 22.8 for obesity; Female 76-(20? Height/waist circumference), more than 33.9 is obesity (all units are meters).
Relevant researchers said that this kind of measurement can better see a person's obesity, regardless of weight. The method is also very simple, just need a tape measure. When measuring, start from the horizontal position of navel, relax and exhale, and don't be covered by clothes. Perhaps with the further popularization, RFM will become a more popular health indicator.