The difference between body mass index and fat percentage:
1, different definitions
Body mass index is actually the abbreviation of body mass index, which is a commonly used standard to measure a person's fat and thin health. Fat rate is the proportion of total fat in human body to the total weight of human body, and it is a coefficient reflecting the fat content in human body, so it can be well distinguished from the two by definition.
2. Different calculation methods
Body mass index = weight (kg)-height 2 (m); Fat rate = 1.2× body mass index +0.23× age -5.4- 10.8× sex (male 1, female 0).
3. Different standards for men and women
Body mass index does not distinguish between men and women in the calculation process, and the algorithm and standard are the same. Among them, the International Health Organization thinks that the ideal body mass index is 22, and the obesity rate of men and women will be different when calculating, and the standards of the two are also different.
Extended data:
The "gold standard" method for measuring body fat percentage;
1, underwater weighing method
This method is a classic method in ancient times, which requires that the human body (including the head) is completely immersed in water, and then the air in the lungs is exhaled. At this time, if you sit on the scale in the water, you can weigh your underwater weight. According to Archimedes principle, the weight of boiling water is equal to buoyancy. Because buoyancy is equivalent to weight, weighing scale's reading is almost zero, and the body fat rate can be accurately obtained by bringing it into the relevant formula.
2, dual-energy X-ray method
Dual energy' refers to two kinds of energy in X-rays, one is high-energy rays and the other is low-energy rays. After the dual-energy X-ray passes through the measured substance, its intensity and energy spectrum will change. These changes contain information such as the mass and density of substances. By comparing the transmission images of high-energy X-rays and low-energy X-rays, you can accurately evaluate the fat content in your body.
3, CT or MRI technology
The advanced method for measuring visceral fat is the gold standard for measuring visceral fat content. The CT measurement of abdominal fat requires the patient to scan the abdomen with CT on an empty stomach.
Baidu encyclopedia-body fat rate
Baidu Encyclopedia-Body Mass Index (BMI)
Baidu encyclopedia-body fat rate