Coffee with milk, as a common drink, usually has no contraindications for pairing and can be consumed in moderation by the average person. Coffee is mainly derived from coffee beans, which contain more than 100 different substances, including caffeine, tannins, oils and nitrogen compounds. Every 100 ml of black coffee contains 60 to 120 mg of caffeine. Caffeine has a certain effect of excitation of the central nervous system, and at the same time can promote the urine out of breath, increase heartbeat, refreshing and so on. Milk is also nutritious food, every 100 ml of milk contains about 54 calories, 3.4 grams of carbohydrates, 3 grams of protein, 3.2 grams of fat, calcium 104 mg. Milk and coffee with can complement each other, both the intake of coffee, but also the intake of milk of various nutrients, is a more common drink. If the coffee is more sensitive to the crowd, you need to reduce the intake of coffee, especially gastroesophageal reflux, gastric ulcer patients should not intake of milk with coffee, simply drink milk can be. Since caffeine can cross the placenta and blood-milk barrier, coffee is not recommended for pregnant and lactating women. People who are allergic to milk or coffee should also not consume coffee with milk.