Is the household weight measurement accurate? The doctor tells you the measurement principle

When talking about physical fat, some people will confuse it with body mass index (BMI). Is BMI absolutely related to physical fat? Does BMI mean that physical fat is normal?

BMI is convenient and easy to use, but there are some limitations

Xin Mingzhe, attending physician of the Department of Heaviness Reduction Surgery at Annan Hospital in Tainan, said that BMI is called the Body Mass Index (BMI). Currently, the US Bureau of Disease Control and the World Health Organization recognizes this formula. Using height as a basis to measure whether the body weight meets the standard is also a common international way to evaluate fatness and thinness and a common indicator for health checks.

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The ideal weight for the general public should be between 18.5 and 24. Young people usually have a lower BMI value, while older people are suitable for higher BMI values, and generally the healthiest BMI value is considered to be 22.

Muscle volume, sportsman has a high BMI

Xin Mingzhe said that there are quite a lot of indicators to confirm whether he is obese, and BMI is just one of them, and blind spots are often seen. The most impressive example is "Lin Shuhao vs. Lianshu".

Xin Mingzhe pointed out that these two highly-known figures have similar height and weight, and their BMI index is similar, but their appearance is obviously different, which can best explain the limitations of the BMI index. Some people with muscle type, such as bodybuilding and weight-bearing, may have a high BMI and are not obese at all.

Because BMI is not accurate and cannot fully show whether the human body is obese, the body fat that can measure human body fat has become increasingly popular in recent years, but many people have only a little understanding of how to measure body fat.

Household fat measurement Although it is not accurate, you can refer to

The principle of general fat measuring devices is to emit trace currents to measure human bioresistance (BIA). Because the water in the human body is different from the water-soluble fat resistance, the body fat ratio can be calculated.

The body weight of household testable fat is limited in accuracy, but it still has reference value. Zhang Yuwen, a nutritionist at Annan Hospital, pointed out that general fat can only estimate the total amount of fat. If you want to accurately measure the body's fat content, especially fat in different parts of the body, subcutaneous area, you must be able to clearly indicate it. Currently, nuclear magnetic resonance (MRI) and energy X-ray absorption meter (DXA) can only be used. This type of equipment has a high price and requires self-paying for related testing.

The value should be accurate. Before measuring the eyebrow angle

She said that physical fat is a second-level medical equipment and must have a government sales license. It is recommended to buy brand products, but do not buy them online casually, which is more guaranteed. It should be noted that even if the most accurate measuring instrument is used, if the measurement method is incorrect, the fat content cannot be accurately measured.

Generally, the measuring instrument measures the resistance. You cannot eat and drink water 4 hours before the measurement. Do not exercise in the first 12 hours. You may urinate as much as possible before the measurement. Remove the metal on the body. There are heart rhythm regulators and other implanted electronic products. The conductor will have troubleshooting. If there is a steel tartar in the body, it will not be accurate.

Because there is a trace current passing through the body during measurement, it is recommended to keep your feet dry during measurement to avoid deviation. In addition, the measurement of the relative fat changes can be more clearly seen by fixed time and condition.

The weight has an upper limit. Obese people should buy medical

fat directly. Before using it, they should read the "Precautions" to avoid misuse. First of all, each fat machine has an upper limit for measuring weight. Liu Cuijuan, director of the Nutrition Department of Chime Medical Center, pointed out that the nursing inquiry clinics has higher lipid meter, and the household price ranges from more than 1,000 to several thousand yuan. Although the accuracy is insufficient, the lipid meter is only used for reference.

Xin Mingzhe also said that lipid machines have extremely limited measurements. If you are overweight and need to be medically rated, it is better to ask a specialist for weight control immediately for help from a weight control doctor.

Liu Cuijuan emphasized that it is better to seek correct treatment than to worry about her and to have a detailed understanding of her lipid status. BMI and lipid scales have at least reference value. In particular, although the BMI index cannot be fully presented in the physical condition, it is simple and convenient to be available at any time and has high acceptance from the public. Promoting BMI has a positive meaning for overall national health control.

Understanding whether the amount of fat is too high, in addition to helping weight control, it can also warn of other physical conditions. Some lipid machines in the room can also detect the degree of body fluid and kidney, and some people accidentally discovered potential diseases such as cardiac, kidney, liver and other potential diseases.

Body Quality Index (BMI)

Calculation method: Weight (kg)/height (meter)

The Ministry of Health and Welfare National Health Network also provides the "BMI Online Calculator", which can be calculated directly online.

Note when using lipid meter

1. Do not eat and drink water 4 hours before measurement.

2. Do not move 12 hours before the measurement.

3. Urinate as much as possible before measurement.

4. Remove the metal on the body.

5. Keep your feet dry while measuring.

6. Measurement of fixed time and status every day.

7. If there are heart rhythm regulators and other implanted electronic products in the body, there will be risks of faults when the power is in trouble, and people with steel stylus will not be able to detect it.

For example: Mr. Wang, a 30-year-old office worker, is 170 cm tall, weighs 70 kilograms, and his body mass index (BMI) = 70/(1.7) 2 =24.2. Therefore, Mr. Wang is too fat.

Consultation/Li Chunsong, Director of Nutrition Department, Liuyouqimei Hospital