How to know the percentage of fat in the body:
Methods for calculating body fat percentage
Many health problems arise when our bodies store a lot of fat , such as high cholesterol, high blood pressure, and insulin resistance, and there is a special danger represented in the fat stored in the waist area. The normal body fat in men is about 8 to 15% of the total body weight, For women of approximately 20 to 30%, [1] in a September 2000 study published in the American Journal of Clinical Nutrition, body-fat percentage may be a better measure of risk for weight-related disease. From the measurement of the body mass index (in English: Body mass index), [2] and the most important methods used to calculate the percentage of fat in the body are the following: [3]
Use the caliper
The skin fold caliper method measures the percentage of body fat by pulling the fat using fingers and then measuring the thickness of the caliper for body fat, the reading is given in millimeters, which is compared with a table based on age and gender to reach the percentage of body fat There are many different types of caliper tests, and one of the most important advantages of this method is that it is accurate and reliable when a person is skilled in measuring. Accuracy for obese people.
Electrical conduction impedance measurement
Bioelectrical Impedance Analysis identifies the opposition that occurs to the flow of an electric current through the body. Muscles have a high water content, so they are able to conduct electrically, while fats have a low water content, so their electrical conductivity is lower. Much, and based on that, this device will measure both height and weight, the percentage of fat-free body mass, and the percentage of body fat, and this method is considered inexpensive and can also be used for people who have a high percentage of body fat, and its negative side is inaccurate Because the results depend on the level of water in the body which may change dramatically during the day.
Use body circumference measurements
This method uses body circumference measurements (Anthropometric) to estimate body fat percentages, waist, neck, and height circumference are taken for men, and hips, neck and height for women, and then using certain equations to calculate body fat percentage, this method is easy and inexpensive, but Inaccurate because body fat is not measured directly.
Underwater weighing
Hydrostatic weighing is one of the most accurate methods for measuring body fat percentage, with an error rate of up to 1.5%, and requires immersion of the entire body in a specialized water tank, based on the fact that bones and muscles are denser than water. Has more bone and muscle than fat will weigh more in water and have less body fat, conversely, a large amount of fat mass will make the body lighter in water, the accuracy of the reading depends on all the air being stopped from the lungs during the examination The test takes 20-30 minutes, and costs about $100-150.
Use of DEXA X-ray absorptiometry
Dual-energy X-ray absorptiometry (DEXA Scan), measures body fat by measuring bone mineral density, muscle tissue, and fat tissue in all areas of the body with a high degree of accuracy. Knowing how fat is distributed in different parts of the body, this procedure uses a low-dose X-ray body scanner, so it is completely safe and takes about 10 to 20 minutes.
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