Researchers from the universities of Southern California and Hawaii found that grapefruit may increase breast cancer risk.
Although it has been shown that it prevents heart and gum diseases, in women who eat them regularly it increased chances of breast caner by almost a third.

It is believed that grapefruit has such characteristics because it increases the levels of oestrogen, female sex hormone already associated with the risk of breast cancer.

The study included more than 50,000 post-menopausal women from five ethnic groups among which 1,657 were suffering from breast cancer. The results showed that eating as little as a quarter of the fruit can increase the danger by 30% in women.

They found the evidence that grapefruit increases plasma estrogen concentrations and as grapefruit boosts estrogen, it has been linked to also increasing the women’s chances of breast cancer.

This study is the first report about commonly consumed food increasing the chances of breast cancer among post-menopausal women.