The Body Mass Index
The Body Mass Index (BMI) is a rough way to determine
if your body is in a healthy state. It is not perfect, but it does provide
a simple way to see if you have anything to worry about.
The Body Mass Index works by taking your weight, and
dividing it by your height (squared). The reason that the Body Mass Index
uses your height and weight in this way is because you would expect two
people who are of different heights to have different weights - even if
they are equal.
A relatively overweight 5ft person would look quite
skinny if they were stretched to be 6ft tall.
When the Body Mass Index doesn't work
The Body Mass Index doesn't always work. It is common
for men involved in sports to look quite fit, yet be obese when they put
their numbers into a BMI Calculator. This is because muscle weights a lot
more than fat, but takes up less room. Therefore, even if have virtually
no fat, your muscle makes you very heavy.
The BMI also ignores bone structure, eating habits,
etc.
What is a good Body Mass Index?
Run your figures through a BMI calculator (click here).
If your BMI is under 18.5, you are classed as underweight. Between 18.5
and 25, you are in the perfect range. Above 25, and you are overweight.
If you are under or overweight (for example 15 or 30 on
the BMI scale) you should consult medical advice - as your health may be
at risk. This is even more important if your weight drops or increases in
a short space of time.
For the reasons outlined above, the Body Mass Index is
simply as indicator - not a perfect tool. If you are sleeping well, are
getting regular exercise and have enough energy to get you through your
day, your body will have found an equilibrium.
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