Coffee is a kind of beverage brewed with powder made from coffee seeds. Because coffee contains caffeine, it has the functions of refreshing, diuresis, strengthening the stomach and sobering up, and coffee contains nutrients such as starch, sugar, fat and protein. Proper intake may have the effect of relieving fatigue, so it is usually recommended to take 6g of coffee powder every day, that is, brew 1-2 cups of coffee.
If taken in excess, it may lead to excessive caffeine intake, exciting the respiratory center and vascular movement center of medulla oblongata, deepening breathing, increasing blood pressure, exciting the heart, dilating blood vessels, relaxing bronchial smooth muscle, diuresis, stimulating gastric acid secretion, thus causing symptoms such as accelerated heart rate and heart discomfort. It should be noted that patients with gastrointestinal diseases are not advised to drink a lot of coffee, otherwise it may stimulate the gastric mucosa and aggravate discomfort.