The first reason is that milk may contain cancer-promoting substances, mainly insulin-like growth factor (IGF-1).

Milk contains more of this factor because growth hormone is commonly used abroad to promote milk production in cows. IGF-1 is a factor that is essential for growth and development in minors, but it also promotes the proliferation of cancerous cells, so having too much of it in an adult's body can increase the risk of cancer.

The problem is that dairy farmers in China have a relatively low level of feeding and do not yet have that economic power and technical level to apply growth hormone, so the possibility of too much IGF-1 in milk is relatively small.

The second reason is that some surveys have shown a positive correlation between dairy consumption and the incidence of prostate cancer.

That is, people who drink a lot of milk also have a greater risk of prostate cancer.

In fact, survey data suggest that while the risk of prostate cancer may increase with increased dairy consumption, the risk of colon cancer becomes smaller. The conclusions of several surveys indicated that there was no correlation between dairy products and the incidence of prostate cancer.

These studies suggest that the same food may have different effects on different diseases. With any kind of food, there are pros and cons, and there is no such thing as an absolutely good food or an absolutely bad food.

In addition, fortified AD milk and yogurt supply considerable amounts of vitamin B2, vitamin A and vitamin D. So it is possible to have a significant nutritional effect with just one glass of milk without increasing the risk of cancer.

The third reason is the results of animal experiments by Prof. Colin Campbell of Cornell University.

His experiments with rats showed that if 20% of milk casein is added to feed mixed with carcinogens, the risk of tumors is significantly increased compared to that of adding plant proteins, as well as very little protein intake, and promotes tumor development at all stages.