The best time to drink plain milk is usually in the morning, which is conducive to the full absorption of nutrients. Plain milk is rich in protein, calcium ions, and vitamins, which are of very high nutritional value to the body. Generally through the night metabolism, the body needs to be replenished with sufficient nutrients and energy in the morning. It is usually recommended to drink plain milk in breakfast with some cereal and mixed food, which will be more nutritious. Especially for adolescent children, whose bodies are in the growth and development stage, the calcium ions in milk can promote bone development and enhance physical fitness. If the quality of sleep is poor, you can also drink a glass of warm pure milk half an hour before bedtime to help improve the quality of sleep. When drinking plain milk, take care not to drink it on an empty stomach as much as possible, especially for lactose intolerant people. Second, plain milk should not be used to deliver medications. If the product is packaged after processing, it should be consumed as soon as possible after opening.