BBC - Health - Healthy living - What is a healthy weight?

Overweight or underweight? Being the right weight has a positive effect on wellbeing but also on our health, as being the wrong weight can cause a range of medical problems.

In this section

What's a healthy weight?
How do you tell if your size is putting your health at risk?

Do you need to lose weight?
If you do, expert advice on how to go about it

Do you need to gain weight?
Would your health benefit if you put on weight?

Does BMI matter?
The body mass index defines healthy weight ranges, but does it matter?

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