blood pressure and cholesterol levels and suppress the immune system. For more information on how to improve you and your partner's fertility log onto zitawest.com.Plan to get pregnant - 10 steps to maximise fertility by Zita West, published by DK, £14.99.

substances like cadmium and lead in the blood. If you smoke you're more likely to have lower levels of vital fertility hormones and it will take you longer to conceive. If you need help stopping, call Quitline on 0800 002200. You need to take care with over

of conceiving. This goes for your partner too, as smoking can affect his sperm count. Exercising will help you maintain a healthy weight, which is important when you're trying to get pregnant. Encourage your partner to wear loose-fitting underwear and jeans