How well do you know your body? Here are the answers to our fitness test

1. (a) Studies suggest five or six ice-cold glasses of water daily could help you burn an extra 40kJ a day.

2. (b) Capsaicin, the hot ingredient in chilli, can rev up your metabolism and reduce hunger, but you need lots of it!

3. (d) Waist size may be a handier measure than BMI. Belly fat is a strong risk factor for heart disease, type 2 diabetes and some cancers.

4. (b) Exercise helps you fall asleep faster and deeper.

5. (a) 54 per cent (that's nearly 7.5 million adults) are now carrying too much weight.

6. (d) If you're not burning more kilojoules than you consume, you won't change your shape in any area.

7. (c) Thirty minutes a day, on most or all days, is fine for good health but be aware there aren't great weight loss benefits with this routine.