There is a rumor circulating in the circle of friends that milk contains hormone IGF- 1 and casein, which is a very powerful cancer promoter. Long-term drinking will lead to a series of cancers such as breast cancer, ovarian cancer, prostate cancer and colorectal cancer.

Truth: This rumor comes from the book "Investigation Report on China" by Professor Campbell of Cornell University in the United States. In fact, the human body itself also contains IGF- 1 hormone. A bag of 220 ml milk contains only about 539 nanograms of IGF- 1. An adult produces about 1 nanogram every day, which is a bag.

In addition, there is no scientific evidence that IGF- 1 is carcinogenic.

In the "mouse experiment" about casein, the casein used in the experiment is the only protein source for mice, which is completely different from human diet. In addition, Campbell's research object is rats that induce cancer cells through high doses of aflatoxin (a strong carcinogen). The carcinogenic factor in rats is aflatoxin, not casein, and the experimental results are not applicable to humans.

So there is no scientific basis for this statement that drinking too much milk causes cancer.