This index was created by Adolphe Quetelet, which is why it is called the “Quetelet index”, although this nomenclature is not practically used. People should know that, Quetelet did not intend to directly establish a relationship between height, weight and fat of the individual, he sought other purposes, however, this relationship became popular relatively recently, in 1985, when a study conducted at 128 people demonstrated the reliability of the method.
The formula is very simple and fast, because it uses the height and body weight of the individual to determine the amount of fat he can have.
There are two ways to calculate body mass index:
- The first has in its composition a mathematical formula par excellence: BMI = Weight / Height2. Weight will always be expressed in kilograms and height in meters.
- The second formula is the use of a nomogram. For example: weight in kilograms, BMI varies from lowest to highest and height. It is about combining weight with height and gives us a result in the central column of BMI. If you are interested, you can find more models of these tables on the Internet.
Why do you think this body mass index exists in the world of health and nutrition? BMI allows the classification of the result obtained after the calculation of BMI in a range indicating thin, normal weight, overweight or obesity.
The set values indicate the following:
- BMI less than 18.50: insufficient weight.
- BMI between 18.50 and 24.99: normal weight.
- BMI between 25 and 26.99: grade I overweight.
- BMI between 27 and 29.99: grade II overweight.
- BMI between 30 and 34.99: type I obesity.
- BMI between 35 and 39.99: type II obesity.
- BMI between 40 and 49.99: type III (morbid) obesity.
- BMI greater than 50: type IV (extreme) obesity.
In conclusion, this index is only indicative. If we find an up-to-date professional with a holistic approach, we will see that it is not necessary to determine this data and set a goal to reach “normal weight”, but rather to focus on assessing your current condition, considering all the symptoms that led you to the consultation.