The benefits of coffee
Coffee beans contain about 100 different substances, including caffeine, tannic acid, oil and nitrogen compounds. Every100g of instant coffee contains 44 ~100g of caffeine; Every 100g of brewed coffee contains 64 ~ 124mg of caffeine. Coffee is a stimulant and has many effects on human body. It can induce diuresis, stimulate the central nervous system and respiratory system, dilate blood vessels, accelerate the heartbeat, enhance the strength of striated muscles and relieve brain and muscle fatigue.
Disadvantages of coffee
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.
Drinking coffee will arouse people's mental excitement. Caffeine can affect sleep within 4 hours after drinking coffee.