British scientists recently analyzed forty-seven studies on female breast cancer from around the world, and found a major finding: the number of children a woman has and the duration of breastfeeding are the two most important factors that determine a woman's chances of developing breast cancer. The importance goes far beyond family medical history, diet, obesity, taking hormones and other factors. This result will help the prevention and treatment of breast cancer, and it also explains why the proportion of women suffering from breast cancer in developed countries is much higher than that in developing countries, and has continued to rise since the end of the 19th century.
The analysis was presided over by Ms. Beru, a professor of epidemiology at the University of Oxford. The report was published in the latest issue of the medical journal "The Lancet" published on the 20th. The 47 studies analyzed covered 140,000 people from 30 countries. There are more than 7,000 women, and the scale is unprecedented. The researchers concluded that for every additional child a woman has, her risk of developing breast cancer decreases by seven percent, and for every year she breastfeeds, her risk decreases by four. three%. Both factors were protective for all women, regardless of race, dietary habits, and age at menopause.
Professor Bei Ruo pointed out that if the reproductive and breastfeeding habits of women in developed countries are the same as those in developing countries, their risk of breast cancer before the age of seventy will be reduced by 6.5%. Three percent down to two. Seven percent, the same as women in developing countries. Reeves, another host of the research project, said that if women in all developed countries prolong the time of breastfeeding for half a year when they give birth to each child, the incidence of breast cancer can be reduced by about 5%, that is, About 25,000 cases are reduced each year.
Taking 1990 as an example, women in developing countries gave birth to six children on average. Five children, breastfeeding each child for two years; in contrast, women in developed countries have only two births per woman on average. Five children, breastfeeding time for each child is only three months. Of the 30 countries covered in the study, the U.S. had the lowest rate of having and breastfeeding women at 50 percent, while mothers in Japan, Scandinavia and developing countries reported breastfeeding rates as high as 90 percent .
Overall, the number of children of women with breast cancer is two. Six, less than two for women without breast cancer. 29% of mothers with breast cancer never breastfeed, compared with 21% of mothers without breast cancer. Among mothers who had ever breastfed their children, those with breast cancer spent an average of 10 months breastfeeding, compared with 16 months for those without breast cancer.
A century ago, the reproductive and breastfeeding habits of Western women were not much different from those of women in other parts of the world. However, with economic development, social transformation, and the advent of oral contraceptives and infant formula, the number of children of Western women has increased. The less breastfeeding time is, the shorter the breastfeeding time, and the incidence rate of breast cancer is also increasing year by year.
Scientists have known since 1970 that if a woman has her first child before the age of 30, her risk of developing breast cancer is greatly reduced. However, whether multiple births and breastfeeding are associated with breast cancer has been debated in academic circles because the studies are often too small and mostly focus on women in developed countries. Therefore, British scientists expanded the scope of their research, collected data on more than 50,000 women with breast cancer around the world, and used nearly 97,000 women without breast cancer as a control group. At the same time, they compared the situation in developed countries and developing countries. draw solid conclusions.
Why multiple births and long-term breastfeeding can prevent breast cancer is still unclear. Some researchers speculate that these two conditions may stimulate hormone secretion or tissue changes, thereby achieving the effect of cancer prevention.
Comment
This is a good proof of Chinese medicine. I have repeatedly told the public that milk is menstruation, and excessive milk that cannot be excreted is the cause of breast cancer. (See HT-2 and HT-5 for details). Remember that every time you menstruate, you must make sure that the milk is completely discharged. Do not take western medicine and keep a good mood. This is the only way to prevent breast cancer. If you are not sure whether the milk is completely discharged, please take my HT-2 and HT-5.
