1. People who are used to drinking a lot of coffee will stop drinking coffee, and they will have symptoms such as headache, irritability, muscle tension and nervousness, and the symptoms will disappear after taking caffeine.

2. Women during pregnancy and lactation should drink coffee in moderation, because caffeine will penetrate into the placenta and appear in breast milk. (Senior three directly ignores this article)

Drinking coffee will arouse people's mental excitement. Caffeine can affect sleep within 4 hours after drinking coffee.