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Can BMI really represent your obesity?

Views: 173     Author: Site Editor     Publish Time: 2019-11-14      Origin: Site

·Using BMI to Measure Obesity Is Not The Most Accurate Solution

The parts that make up our bodies include fat, muscles, bones, blood, tissue fluids, and so on. Too much fat can lead to metabolic disorders and inflammatory reactions, which in turn leads to a series of health problems. Obesity refers to the accumulation of too much fat in the body and causes health damage. It is not only an independent disease, but also a risk factor for many diseases. In addition, because of social prejudice, obesity may also have a negative impact on personal self-esteem, self-confidence and mental health. These are the reasons why we are afraid of obesity.

I'm sure you can see the problem: when we talk about obesity, we're talking about fat; when we talk about BMI, we're talking about body weight.In fact, the mass composition of the human body is divided into two camps: fat, called fat mass, and all the others, called lean mass. 

Of course, a more accurate indicator exists, that is, body fat ratio, that is, fat mass to body weight. However, it is much more complex to measure the body fat ratio of BMI, than the simple calculation. There are many methods to measure body fat, including bioelectrical impedance analysis, underwater weighing, capsule gas replacement, X-ray tomography and so on. The accuracy of these methods varies, the most accurate of which is dual-energy X-ray absorption, but this usually has to be done in hospital, and it is expensive. Of course, some people use visual methods, that is, based on mannequins with different body fat ratios to roughly estimate the range of body fat. These simple methods are also relatively low in accuracy.

·BMI Is Not Omnipotent.

As an alternative to obesity, in most cases, the BMI was good. Using BMI, researchers have found that obesity (including overweight) is an important risk factor for death and many diseases, such as cardiovascular disease, endocrine and metabolic disorders, malignant tumors, bone and joint diseases, sleep apnea syndrome, etc. However, no matter how strong the association between BMI and body fat rate, it can not replace 100% body fat rate, and this strong correlation can not be repeated in all populations.

First of all, BMI mixes fat mass with lean body mass. Athletes with developed muscles have higher muscle tissue quality and BMI overestimates their body fat rate. Patients with edema have increased tissue fluid quality and BMI can overestimate their obesity levels. As you get older, muscle tissue decreases more than adipose tissue, so BMI underestimates obesity in the elderly.

Moreover, BMI is difficult to distinguish the distribution of fat. The health effects of fat accumulation vary from place to place. Skinfold thickness refers to subcutaneous fat. The fat that surrounds the viscera is called visceral fat, which accumulates mainly in the abdomen and shows an apple-shaped figure (central obesity). Visceral fat is more associated with obesity-related diseases. Increased abdominal fat is an independent risk factor in people with low BMI levels. Compared with BMI, waist and waist and the hip ratio can reflect the content of abdominal fat. 

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