Coffee with milk powder as a common drink, moderate consumption is generally not harmful, can help the human body to supplement protein and other nutrients; if excessive consumption, may trigger insomnia and other adverse reactions. Coffee is one of the most popular beverages in the world, black coffee is extremely low calorie, no added sugar when the calorie is close to 0. 100 ml of black coffee contains 1 calorie, of which 0.1 grams of protein, 0.1 grams of carbohydrates, calcium 3 mg, iron 0.3 mg. Milk powder is very nutritious, every 100 grams of milk powder contains 484 calories, of which 22.7 grams of fat, 20 grams of protein, 50 grams of carbohydrates, calcium 1797 mg, so milk powder is a good source of protein and calcium. Coffee with milk powder is very compatible in taste, while complementing each other’s strengths and weaknesses, and can provide a variety of nutrients for the human body. Coffee is low in calories, and its main components are caffeine and water, which can refresh the mind, but overconsumption is likely to cause increased heart rate, insomnia, gastrointestinal discomfort and many other side effects. Gastroesophageal reflux, gastritis, gastric ulcers and other patients, people with poor sleep, cardiac arrhythmia patients are not recommended to drink coffee with milk powder. It is recommended that ordinary people consume coffee with powdered milk in moderation.