Employees of National oncologic institute of the USA have found out, that Americans of the Asian parentage who have started to eat a soya in the childhood, are ill with a mammary gland cancer less often.

According to statistical data, at white Americans the breast cancer is diagnosed in 4-7 times more often, than for inhabitants of China or Japan. But already through some generations at descendants of the Asians who have emigrated to the United States, the risk of occurrence of this serious illness is essentially enlarged. In other words, in cancer development the big role is played not by genetics, and any other factor.

Interrogation of 1 600 Chinese women, Japanese and the Filipinos living in San Francisco, Oakland, Los Angeles and on Hawaii, has shown, that 600 from them are ill/were ill with a cancer, other women are completely healthy. If mother of the participant of interrogation a vein in the USA, scientific were interested at it in what quantity of a soya was consumed by her daughter at children's age.

The result of interrogation is that: women who in the childhood ate products from a soya in considerable quantities, on 58 % risked less to be ill with a breast cancer. It is curious, that unknown protective action of a soya weakened, if the person started to use it, being the teenager or full age. The interrelation between the soya use in the childhood and reduction of risk of occurrence of a cancer remained at all women who were taking part in interrogation, without dependence from their genetic predisposition to a cancer.

Scientists cannot explain yet why the soya has protective an effect on an organism of women. Experiments on animals have confirmed, that the soya helps to ripen earlier to tissues of a mammary gland and it is better to resist to the agents causing a cancer.