Humans are mammals themselves, drinking milk like babies. Breast milk is not only the only nutritious food for babies, but also rich in antibiotics, which can protect babies from infection while their immune system is still developing.
As humans develop more complex brains, they find that they can use other animals and use milk as food. This is a good resource, because it can provide continuous nutrition even in the case of famine or other food shortages. But with the growth of human beings, human beings will lose the ability to produce lactase. This enzyme helps to digest lactose, the main sugar in milk. With the habit of drinking milk in adulthood, some mutations in the human genome enable them to produce lactase, so they can eat milk for life. It is conceivable that this will be an advantage for early humans who were still struggling to catch, harvest fruits and hunt games at that time.
Therefore, you can say that drinking milk is very beneficial to human beings, and it will always be so, because milk is like this digestible infant formula. If we can produce lactase, it will provide us with a lot of nutrition. Having said that, we should also remember that not all milk is the same. Different kinds of milk have different ingredients, which are most suitable for their habitats.
For example, seals produce swirling milk in fat, so that their cubs can get a protective layer of fat, so that they will not die in the harsh cold weather of the tundra. Other species (such as goats) will not produce fat-rich milk for newborn babies, because the evolutionary advantage is not to produce high-calorie milk for young people at the expense of life. Therefore, compared with seals, these milks have higher protein and lower fat. Cattle? The fat content in milk is the closest to breast milk, and its fat content is slightly lower than breast milk. The fat content of buffalo milk is twice that of milk.
Many of them are saturated fats. However, as long as you want to swallow as much milk as possible, because our body is very good at handling the milk put into it. But that's not the problem. Milk also contains bovine growth hormone, and calves need to grow into adult cows and bulls. But researchers have begun to point out that this may be harmful to the human body because it destroys the hormonal balance of the system. But remember, if you don't want to drink milk, but choose a vegetarian substitute like soybean milk, then the isoflavone in soybean behaves like estrogen in the human body, and it can be imagined that it will also confuse hormones.
So, in a word, our ancestors drank milk for thousands of years, and the milk has always been in their hands. There may be some problems with drinking milk, but don't worry about a glass of milk. There are many important problems to be solved.