Body mass index, usually abbreviated to BMI (from the English body mass index) is the number used as a measure of obesity, allowing static comparisons of people with different height. The index is calculated by dividing the weight of a man by the squareof its height: the formulas in this set as weight in kilograms and height in meters, and the resulting unit kg / m² is to be omitted.

Body mass index, created sometime between 1830-185 Belgian Adolphe Queteletscholar at work on their system "social physics", because BMI is sometimes also referred to as Queteletův index.



BMI is generally considered to be merely a statistical tool for a particular individual'sBMI is too simple way that ignores many important factors (eg body composition, the amount of muscle, etc.). In clinical practice, therefore, more accurate tests are usually used as a measurement of the thickness of subcutaneous fat, impedancemeasurements, etc.
BMI is useful for statistical surveys of extensive samples of the population, mostly to investigate the correlation between obesity and other factors. The reason for the use of BMI is that it is sufficient for its use in the data indicate the height and weight. Ifthe data were available as the results of bioimpedance measurements, BMI would be unnecessary, but for routine surveys usually do not apply.
Calculation of BMI for a specific individual can not therefore be taken as an absoluteindicator, but rather only as a rough guideline, which should be used
only one of several means.

The numerical values ​​of BMI
values ​​of BMI
The population index values ​​appear to range from approximately 15 (severemalnutrition) to over 40 (morbid obesity). The exact boundaries between different categories of (severe malnutrition, malnutrition, optimal weight, etc.) between different experts vary, but generally a BMI below 18.5 is considered underweight, which can be a symptom of some disorder or other health problem, while a BMI over25 is considered overweight and over 30 as a sign of obesity. These limits apply toadults older than 20 years.




Commonly, the following limits:
underweight: BMI ≤ 18.5
Ideal weight: 18,5-25
overweight: 25-30
Mild obesity: 30-35
Central obesity: 35-40
morbid obesity: BMI> 40
As already mentioned, however, BMI is only a statistical tool, in particular persons may vary from state clinical significance of the measured values ​​of BMI. For example. might be worth a BMI over 30 and still not be overweight, because the highvalue of the index is given to him with plenty of muscle. Conversely older people with a small amount of muscle can be medically obese, even though their BMI isclassified as an ideal weight.
The boundary values ​​of BMI also varies for different. For example. Asians use a slightly lower threshold for overweight there already consider people with a BMIabove 27.5, as the ideal BMI range 18,5-23.

Tip: Try to calculate your BMI on any of the following sites: