Caffeine is a xanthine alkaloid compound and a central nervous system stimulant, which can temporarily drive away drowsiness and restore energy, and is used to treat neurasthenia and coma resuscitation in clinic. Therefore, caffeine is also the most widely used psychotropic drug in the world.

2, breastfeeding mothers had better not drink coffee, because it will have a certain impact on the baby.

Coffee contains caffeine, which excites the central system. When breastfeeding mothers want to relieve fatigue by drinking coffee, when breastfeeding their babies, the babies will absorb caffeine from their mothers into their weak bodies through milk. Because the baby is still very fragile, a small dose of caffeine can cause the baby to be excited, make the central nervous system excited, easily bring uneasy emotions, and bring certain adverse effects on the baby's healthy growth.

1, caffeine is a plant alkaloid, which can be found in many plants. As a natural insecticide, it can paralyze insects that devour caffeinated plants. Caffeine-containing plants commonly used by human beings include coffee, tea and some cocoa. Other less commonly used trees include Paraguayan holly and Guanana trees, which are commonly used to make tea or energy drinks.

2. The main source of caffeine in the world is coffee beans, which are also the raw materials of coffee. Coffee Generally speaking, the content of caffeine in a cup of coffee ranges from 40 mg in espresso to 100 mg in espresso. Deep roasted coffee generally has less caffeine than light roasted coffee, because roasting can reduce the caffeine content in coffee beans.

3. Tea is another important source of caffeine. The caffeine content of each cup of tea is generally only half that of each cup of coffee, which depends on the intensity of tea making. Certain kinds of tea, such as black tea and oolong tea, have higher caffeine content than other teas. Tea contains a small amount of theobromine and theophylline slightly higher than coffee.

(Source: Caffeine-Baidu Encyclopedia)