You don't know the disadvantages of milk. Milk is the most common beverage and an important source of water, calcium and protein. In addition to strengthening bones, calcium has many important physiological functions. Protein contained in milk is not only complete in amino acids, but also the easiest to digest. Because milk production is abundant and there are many kinds of dairy products, it is necessary for people who are diligent in health care to distinguish the advantages and disadvantages of various dairy products and know what to choose. Fresh milk mainly contains water. Whole milk contains about 3% animal fat, and low-fat milk also contains 1% to 2% animal fat. The difference of animal fat content between full-fat and low-fat milk is 1% to 2%. As long as you don't drink many cups every day, there won't be much difference in the amount of animal fat you eat in your stomach. Pay attention to animal fat content when drinking more than five cups of milk every day. Each cup of milk is about 250ml, which is equivalent to about 250g. One percent of the animal fat content is 2.5 grams, and five cups of milk a day is about 13 grams, which means that drinking low-fat milk every day is about 13 to 26 grams less than drinking whole milk, which is about 14 to 28 ml of animal fat, so the difference is quite amazing. Animal fat in milk contains 50% saturated fatty acids, which is considered to be the main component leading to systemic arteriosclerosis, coronary heart disease, thrombotic stroke, breast cancer, colorectal cancer and prostate cancer. Although the answer to how saturated fatty acids cause these chronic diseases is not clear, fat deposits in strips on the arterial wall, which is a prelude to arteriosclerosis; High-fat food will increase the viscosity of blood, make blood easy to coagulate and cause stroke; High-fat food can promote bile secretion and make fat easier to absorb, but there is a lot of cholic acid in a lot of bile, which is a cancer promoter of colorectal cancer and promotes the formation of colorectal cancer; Animal fat can increase the content of cholesterol in blood, which is the raw material for liver cells to make cholic acid. So drinking too much whole milk will inevitably increase the secretion of cholic acid. Cholic acid flows out of the gallbladder, and after living in the duodenum, it will come to the large intestine with intestinal peristalsis, slowly contributing to colorectal cancer. Whole milk may also increase the incidence of other cancers, such as oral cancer, gastric cancer, lung cancer, ovarian cancer, endometrial cancer and cervical cancer. Scholars believe that animal fat is a kind of cancer promoter, which can promote the formation of cancer through various mechanisms. Children's development needs fatty acids and cholesterol, with fast metabolism, strong cell activity and strong ability to repair damaged cells. The advantages of drinking whole milk outweigh the disadvantages. Adults have slow metabolism, weak cell activity and weak ability to repair damaged cells. Drinking whole milk does more harm than good. Adults and the elderly had better drink low-fat milk. Skim milk powder has lower fat content than low-fat milk and can also be used. There is a great difference between milk powder and milk, so people who drink milk with milk powder should pay special attention. Milk powder is dry, and the fat content of full-fat instant milk powder is particularly high. Milk powder is 28% animal fat, which is quite amazing. The fat content of low-fat instant milk powder is as high as 1 1%, that is, 10% in milk powder is animal fat; The fat content of skim milk powder is less than 1%, which is the lowest among dairy products at present. Many brands of skim milk powder have high calcium content. If you drink two or three cups of skim milk every day, you will consume 1000 to 1500 grams of calcium, which is the daily calcium intake of adults and the elderly. Daily dose of vitamin D is often added to skim milk powder to promote calcium absorption and reduce calcium excretion with urine. It is obviously not suitable for adults to use full-fat or low-fat milk powder, and the animal fat content is high, so skim milk powder is a better choice. Another disadvantage of milk and milk powder is that many people will have lactose intolerance when they drink too much milk. The sugar in milk and milk powder is called lactose. Lactose intolerance means that intestinal mucosal cells cannot produce enough enzymes to digest (decompose) lactose. In this way, a large amount of lactose sucks the water in the blood vessels of the intestinal wall into the intestine, and at the same time, lactose promotes the intestinal peristalsis more intense, and the watery intestinal contents go straight to the anus, resulting in diarrhea symptoms; When the intestinal peristalsis (contraction) is severe, it shows the symptoms of abdominal pain. Most of the animal fat in skimmed milk powder has been removed, and the lactose content is relatively increased. If the skim milk is soaked thick, there is a great chance of diarrhea after drinking it. The most important purpose of drinking milk is to absorb calcium, protein and water. One glass of skim milk in the morning and one glass in the evening is enough. If drinking two cups a day will cause diarrhea, you can drink one cup a day instead and add more in a few days, so that you won't have diarrhea. Some people are allergic to milk, diarrhea and abdominal pain after drinking milk are not symptoms of lactose intolerance. Such a person cannot drink milk. Most people who are allergic to milk are infants, and some children are allergic to milk. The ingredients of milk are allergens for these people, causing allergic reactions. There are also some gastrointestinal diseases that are "sensitive" to milk, causing abdominal pain and diarrhea, which are not allergic reactions. Usually allergic reactions only occur in a few people, and adults are not allergic to milk. Whether they are allergic to milk can only be known if they drink milk. Protein in milk and dairy products is an allergen, which can cause body allergy, but it shows allergic symptoms. Protein is usually digested into amino acids by enzymes in the gastrointestinal tract and then absorbed, but some protein can still be absorbed into the blood circulation without digestion, so protein is regarded as an allergen by the human body. In addition to diarrhea and abdominal pain, allergic symptoms of dairy products can also be manifested as the deterioration of chronic diseases (such as rheumatoid arthritis and asthma). Such patients avoid eating dairy products. Another disadvantage of milk is that it will aggravate peptic ulcer, which is quite common. Full-fat, low-fat and skimmed milk can promote gastric wall to secrete more gastric acid, which is not conducive to patients with peptic ulcer. Such patients should avoid drinking milk. Cheese is a protein where milk is sour. In the production process, lactose has been automatically separated, so it will not cause diarrhea. Cheese made from whole milk is full-fat cheese, and cheese made from low-fat milk is low-fat cheese. Children can eat full-fat cheese, and adults should eat low-fat cheese. Although milk and dairy products have a long list of shortcomings, it is not difficult to get rid of or avoid their harm as long as we know ourselves, seek good fortune and avoid evil, and make use of the advantages of dairy products. This is the most basic principle of diet health. There is no food with zero defects in the world. If we only highlight the harm of dairy products and ignore their benefits, we will study their motives or reasons. Therefore, experts suggest that milk and soybean milk should be in moderation.