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The woman is a Ministry of Health, Labour and Welfare study group from which the liver cancer hazard rises to the breast cancer risk decrease without eating the soybean too much.

The soybean: The woman doesn't eat too much and the liver cancer hazard rises to the breast cancer risk decrease. --Ministry of Health, Labour and Welfare study group

The woman who eats a lot of soy products has understood the hazard that becomes a liver cancer compared with the woman who doesn't eat so much rises to 3-4 times from the large survey of the study group of Ministry of Health, Labour and Welfare (principal investigator and Tsukane Masaichiro and National Cancer Center preventive study Director-General). It is known that the isoflavone included in the soybean decreases the risk of the breast cancer, and the study group assumes, "Taking moderately through meal is good".

The study group pursued the medical condition of about 20,000 men and women (40-69 years old at the start) in six prefectures from 93 to 05 years. 101 people (69 men and 32 females) became the liver cancers. The relation between the dietary intake and the appearance of disease of the 2 component of the Kao question to eat how much soybean food by the questionnaire and the isoflavone was examined.

As a result, it was about 3・2-3・9 times the risk of the crowd with the fewest risks that the crowd with most dietary intakes (more than 2/3 natto packing 80 grams or more of the bean curd each day) becomes a liver cancer only by the woman (less than this bean curd 40 grams and less than 1/3 natto packing) that the relation between the dietary intake and the risk was clarified.

The molecular structure of the isoflavone looks like the estrogen of the female sex hormone according to Kurahashi Ten and the National Cancer Center preventive study part researcher of the study group. Estrogen are in the hemihedry and the liver cancer that improves the risk of the breast cancer the preventing actions, and is thought that the toxic dose of the isoflavone disturbs such an action.

The Kurahashi researcher｢The risk factor of the the greatest of the liver cancer is a B type, and a C hepatitis C virus. I want you to note taking the soy product too much if the presence of the infection is first examined for the woman, and the infection is understood. Care is necessary for an excessive taking too much even if it is not infected. ｣It specifies it.