Eating grapefruit every day could raise the risk of developing breast cancer by almost a third, US scientists say. The researchers, at the universities of Southern California and Hawaii, found that women who ate one quarter of a grapefruit or more every day had a higher risk of breast cancer than those who did not eat the fruit at all. The fruit is thought to boost levels of oestrogen - the hormone associated with a higher risk of the disease, the British Journal of Cancer reported.
The researchers found that in women who ate at least a quarter of a grapefruit daily, levels of oestrogen were higher. They said: "It is well established that oestrogen is associated with breast cancer risk. "Therefore, if grapefruit intake affects oestrogen metabolism leading to higher circulating levels, then it is biologically plausible that regular intake of grapefruit would increase a woman's risk of breast cancer." (from bbc )
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