BCS body composition scales

What is BMI?

What is BMI

What is BMI?

BMI (Body mass index) is a measurement used by physician to judge a patients healthy weight and is now considered the norm when discussing weight.  We are always being asked questions about childhood obesity, fat percentage and muscle mass, but the most popular question is always "how do I calculate my BMI?". 

You can calculate your BMI simply by using the following equation.

Divide Your Weight in Kilograms (kg) by your height in meters (m) then divide the answer by your height again. This then gives you your BMI score.

Eg: If you weigh 70kg and you're 1.75m tall, divide 70 by 1.75. The answer is 40.

Then divide 40 by 1.75. The answer is 22.9. This is your BMI.

What is a good BMI score?

For an average person, an ideal BMI score is between 18.5-24.9.

If your BMI is 25 or more, your weight more than is ideal for your height and you fall into the following categories:

  • 25-29.9 is overweight
  • 30-39.9 is obese
  • 40 or more is very obese

If your BMI is less than 18.5, your weight less than is ideal for your height.

BMI is a very cost-effective solution and gives a good indication of a person’s health. However, as we know people don’t always fit into nice simple mathematical equations and as such BMI can prove misleading.

Your BMILet’s take the following stats from a well know Rugby player at the height of his playing carrier. He weighs 114kg and has a height of 194cm which gives him a BMI score of 30.2

As you can see I don’t think you can call any professional rugby player obese but this score speaks for itself.

Exercise also plays a critical role in maintaining our body weight and health, but monitoring its advantages can sometimes prove difficult.  For instance, many people who start exercising find that they do not lose weight straightaway which in turn can cause them to become demotivated. However, this can usually be associated with replacing fat with muscle, which has a considerably high mass.  The advantages of this transformation are enormous and once demonstrated to your patient can prove highly motivational.

BMI alone can also fail to pick up on other health issues such as age related changes. These can be due to our body’s gradual process of increasing fatty tissue and depleting lean muscle.  So even though a person’s weight may not change over their lifetime, their body composition may change extensively.

So as we have shown BMI doesn’t hold all the answers so what is beyond BMI?

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