Drinking too much coffee can lead to insomnia, rapid heartbeat, memory loss, loss of appetite and so on. In severe cases, there may even be heart damage and edema.

The main ingredient of coffee is caffeine. Drinking too much coffee will stimulate the peristalsis of the stomach and the secretion of gastric acid, causing gastrointestinal spasm. It can also lead to chronic gastritis. At high doses, caffeine can cause tachycardia, and sensitive person may have arrhythmia, such as premature beats. Drinking coffee for a long time will increase the blood cholesterol concentration, but this is not caused by caffeine, but related to other components contained in coffee.

Drink coffee in moderation.