Phyto-oestrogens are plant compounds with oestrogen-like biological activity and occur particularly in legumes and beans (Soya and tofu) and also in cereals, fruit and vegetables. There is some evidence that a diet rich in phyto-oestrogens, such as that of traditional Asian populations, is associated with a lower risk of some Western diseases such as cardiovascular disease and some cancers. The study is addressing three main issues: