milk brings us to the grave of cancer Last year, the rumor spread widely on the Internet. At that time, the media interviewed professionals from all walks of life to write articles to refute the rumors, which finally stopped for a period of time. But recently, there has been a lot of noise, and it has been continuously transmitted in the wechat circle of friends, which has surprised people who are used to drinking milk. Some friends have come to ask and reply as follows:
1. The question about hormones in milk: hormones can’t make cows produce milk!
the wechat points out that cows produce milk by beating high doses of hormones, and the growth factors of estrogen, androgen and insulin are the main carcinogens in milk. Meanwhile, it is said that IGF-1 (insulin-like growth factor-1) in milk is easy to cause cancer, and the protein quality in milk increases cancer, heart disease, diabetes, multiple sclerosis, kidney stones, osteoporosis, and high blood pressure The risk of diseases such as hypertension, cataract and Alzheimer’s disease. The fact of
is that hormones will not make cows produce milk, because cows, like other mammals, only begin to secrete milk after they have given birth to calves, and will stop secreting milk after about 10 months. These are not completely achieved by hormones. Farms do inseminate cows at the right time during lactation, and pregnant cows will give birth to calves again and start a new round of milk production. In fact, the hormone used for dairy cows is growth hormone, rather than sex hormones such as estrogen and androgen. This kind of growth hormone can not make cows produce milk without pregnancy, but mainly to increase milk production.
the United States Food and Drug Administration (FDA) approved the use of artificial bovine growth hormone in the 1990s in order to make dairy cows produce more milk. In many countries (such as the United States, New Zealand, etc.), as long as it is industrialized and intensive dairy farms, foreign hormones will be used to synchronize the estrus of cows. If there is no foreign hormone intervention, dairy cows are completely in the state of stocking and free range, and the milk yield can not be guaranteed. And the growth hormone allowed will not damage consumers’ health. Can
2, casein and IGF-1 cause cancer? There is no evidence that milk can cause cancer.
wechat mentioned American Professor Colin Q Campbell, saying that his research shows that protein in milk is a very strong cancer promoting agent, especially casein, which accounts for 87%, can increase the incidence of cancer, heart disease, diabetes, kidney stones, hypertension and other diseases. At the same time, IGF-1 in milk leads to breast cancer in women and prostate cancer in men.
In fact, Professor Campbell cooperated with academician Chen Junshi of our Institute (Institute of nutrition and food safety of China Center for Disease Control and prevention) for many years. From 1981 to 1989, he conducted three epidemiological studies on diet, lifestyle and disease mortality in 69 counties of 24 provinces and autonomous regions in China 》。 The research on bovine cheese protein carcinogenesis mentioned in the book is not the mainstream academic point of view in the nutrition field. The World Cancer Foundation has no stronger evidence to prove that milk can increase the risk of cancer. As far as I know, Campbell’s experiment is to induce cancer rats with large doses of aflatoxin (a strong carcinogen), and then feed them with diets containing different proteins. It is not possible to directly deduce that casein has the same effect on healthy people. The United States FDA and the Joint Expert Committee on food additives (JECFA) of the World Health Organization and the food and Agriculture Organization of the United Nations agreed that “there is no evidence that IGF-1 causes cancer”. At the same time, the content of IGF-1 in milk is very low. After being heated, digested and absorbed, it has no biological activity and does not constitute a health hazard. Campbell also said in an interview with people’s daily life times in December 2006 that his research “does not mean that dairy products can cause cancer”.
do have epidemiological studies that suggest that excessive intake of milk may increase the risk of prostate cancer and Parkinson’s disease. However, domestic and foreign population studies have also confirmed that milk can reduce the risk of colorectal cancer, cardiovascular disease, hypertension and diabetes, which are scientifically confirmed.
a U.S. study followed 37183 respondents for 10 years, and found that eating more low-fat dairy products in daily diet is conducive to reducing the risk of type 2 diabetes in middle-aged and elderly women (liuetal, 2006). Another US study, which followed 82076 postmenopausal women for eight years, also found that low-fat dairy products helped prevent diabetes, and the more overweight and obese women, the more obvious the effect. （Margoliset al 2011）。 How much milk do you drink every day? 300 ml per day is recommended. The results of nutrition survey of
in recent 20 years show that the average daily milk consumption of residents in big cities is less than 50 ml, and the national average is only 20 ml. “The pagoda of balanced diet for Chinese residents” recommends a daily milk intake of 300 ml, which is about the world’s average level, far lower than that of European and American countries and other countries.
in the current dietary structure of Chinese residents, milk can be taken as the preferred food to supplement calcium because of its high calcium content and high absorption and utilization rate. There is no need to mythologize milk or demonize it. Treat it as a common food with a normal heart. Advocate rational and moderate consumption of dairy products, Chinese people eat very little dairy products, the risk of excessive is very small, so there is no need for excessive anxiety, intake of appropriate amount of milk will not cause health damage. Drinking 250-300 ml milk a day will not increase the risk of disease, but will bring health benefits.
attach a message just seen: “milk may be beneficial to female patients with knee arthritis] arthritis care & Research: American scholars report that women with knee arthritis drink more low-fat or skim milk, which can slow down the development of the disease. In other words, milk has a protective effect on knee arthritis. Studies have also confirmed that yogurt and cheese have no such effect. Nutritionists point out that milk is rich in phosphorus, calcium and protein, which are good for bones.