Milk and breast cancer: new study suggests risks
According to a new study conducted by Loma Linda University Health researchers, there is a possible relationship between milk intake and breast cancer. The researchers found that even relatively moderate amounts of such products can increase the risk of breast cancer in women, depending on the amount consumed, by up to 80%.
Link between milk and breast cancer
The observational study gave “fairly strong evidence that either milk or another factor closely related to drinking milk is a cause of breast cancer in women. This is claimed by the first author of the paper, Gary Fraser.
“Consuming only 1/4 to 1/3 cup of milk a day was associated with a 30% increased risk of breast cancer. Drinking up to one cup a day increased the associated risk to 50%. For those who drink two to three cups a day, the risk increased further to 70% to 80%. “Nutritionists recommend three cups of milk a day. “However, the results of this study suggest that people should consider this recommendation with caution,” said Fraser.
The scientists evaluated the food intake of almost 53,000 women, all of whom were initially cancer-free, for almost eight years. They estimated the consumption of milk using questionnaires on the frequency of food. The subjects also repeated these around the clock. A basic questionnaire included questions about demographics, family history of breast cancer, physical activity, alcohol consumption, hormonal and other medication use, breast cancer screening, and reproductive and gynecological history.
At the end of the study period, there were 1,057 new breast cancer cases during the follow-up. Regardless of the dairy, no clear associations between soy products and breast cancer were found. However, the higher intake of milk calories and milk was associated with a higher risk of breast cancer. This was also independent of the soy intake. Fraser found that results showed only minimal deviations when comparing the intake of full fat with reduced or fat-free milk. No important associations with cheese and yogurt were found.
“However, dairy products, particularly milk, were associated with an increased risk and the data predicted a significant reduction in the risk. This is associated with the replacement of milk with soy milk. This increases the possibility that milk products with a milk change are optimal. “Choice.”
A dangerous effect of dairy products is in line with the latest AHS-2 report that vegans, but not lacto-ovo-vegetarians, had less breast cancer than non-vegetarians.
Fraser said the possible reasons for these associations between breast cancer and milk could be the sex hormone level in milk, since the cows are naturally breastfeeding and often around 75% of the milk herds are pregnant. Breast cancer in women is a hormone sensitive cancer. In addition, in some reports, milk product and other animal protein intake is also associated with higher blood levels of a hormone called insulin-like growth factor 1 (IGF-1), which is thought to promote certain types of cancer.
“Milk has some positive nutritional values,” said Fraser, “but these have to be weighed against other possible, less helpful effects. The work in this study suggests the urgent need for further research. ”
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