Understanding BMI results in adults 

Find out how to calculate your body mass index (BMI) and interpret the results correctly.

Read more about BMI

Transcript of Understanding BMI results in adults

This video is about understanding BMI in adults.

The Body Mass Index is a simple way to take a look

at whether your weight is healthy in relation to your height.

Dr Julian Spinks GP

You take your height in metres, multiply it by itself

and then divide your weight in kilograms by that.

In fact, generally it's a lot simpler to go online

and use a body mass calculator,

or a table which allows you to look it up.

It's very useful to know your BMI,

because it allows you to see whether you're underweight,

that's a BMI below 18.5,

or if you're overweight, one over 25.

Because if you are overweight, you carry a higher risk of diseases

such as heart disease and stroke and type 2 diabetes.

Once you know what your BMI is,

you know whether you need to be losing weight to improve your health.

Being underweight is also not healthy.

So if your Body Mass Index is below 18.5,

it may mean that you need to build your weight up.

You've got to do that in a healthy manner

and it's worthwhile talking with a doctor to find out how.

There are some circumstances where Body Mass Index isn't applicable.

If someone is a very athletic type who has a lot of muscle,

then the Body Mass Index will be overestimated by the calculation.

Also, women who are pregnant, the pregnancy will push their weight up

and the BMI will go up with it.

Also we need to take into account where your weight is.

If you put on a lot of weight around your middle,

it may be that you're unhealthy,

even though your BMI appears to be within the normal range.

In people where most of the weight has gone on round the middle,

there are alternative ways of looking at healthiness,

one of which is to measure your waist circumference

or to look at the ratio between your waist and your hips.

Your doctor will be able to advise you how to do that.

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