Some adults have the habit of drinking milk in the morning. This method is unscientific, because after a night's sleep and rest, people's stomachs have already been emptied, and they are ready to eat and digest food. At this time, the stomach is also emptied quickly, and milk is liquid milk, so the stomach is discharged faster. Drinking milk on an empty stomach is discharged into the intestine before it is fully digested and absorbed in the stomach, resulting in the loss of nutrients. Milk is rich in high-quality protein. The main function of these protein is to form new tissues of human body, but also to repair the original tissues. If you drink milk on an empty stomach, not only the milk will be discharged from the stomach quickly, but also the above-mentioned precious protein will be decomposed by the human body and consumed as heat, which will not fully play the due role of protein. It is a pity. Protein in milk is digested and decomposed into various amino acids in human stomach by pepsin and small intestine before it can be absorbed and utilized in small intestine. Drinking milk on an empty stomach makes some protein not decomposed into amino acids, and some amino acids are discharged into large intestine before being absorbed in small intestine. In large intestine, these protein and amino acids are decomposed and decomposed into substances harmful to human body, which makes precious protein fail to fully play its due role. It also increases the burden on the human body. To change this situation, first of all, don't drink milk on an empty stomach in the morning, but drink milk after breakfast 1-2 hours, because there is food in the stomach to prevent the shortcomings of drinking milk on an empty stomach; Second, eat some foods with more starch before drinking milk, such as steamed bread; Third, when drinking milk in the morning, you should eat some starchy foods such as steamed buns, rice, bread, biscuits and snacks, so that milk can stay in people's stomachs for a long time, and milk and gastric juice can be fully hydrolyzed, so that protein can be well digested and absorbed. Milk has a hypnotic and calming effect. Morning is the time when people study and work energetically. Drinking milk makes people feel sleepy, but it is not good for study and work, so it is best not to drink milk on an empty stomach in the morning. When is a good time to drink milk? It is best to drink milk at night, because milk contains L tryptophan, a biochemical substance that can make people feel tired and sleepy, and traces of morphine substances, all of which have certain sedative and hypnotic effects, especially L tryptophan, which is the main raw material for the brain to synthesize hydroxyl color. Serotonin plays a key role in brain sleep, which can temporarily inhibit brain thinking activities, thus making people want to sleep, without any side effects. Moreover, milk can be absorbed by sticking to the stomach wall, and calcium in milk can also remove tension. Drinking milk before going to bed is beneficial to the body's absorption and utilization of calcium. Most of the calcium ingested at dinner is absorbed and utilized by the human body before going to bed. After sleep, especially after midnight, the level of calcium in blood will gradually decrease, and the decrease of blood calcium will promote hyperparathyroidism. Hormones will act on bone tissue, so that part of calcium in bone tissue will be dissolved into blood to maintain the stable balance of blood calcium. This dissolution is a self-regulating function of human body, which will become one of the causes of osteoporosis after a long time. Drink milk before going to bed at night, the calcium in milk can be slowly absorbed by the blood, and the blood calcium can be supplemented and maintained in balance all night, so it is not necessary to dissolve the calcium in bones, which prevents bone loss and osteoporosis, so it is good to drink milk before going to bed.