Caffeine, because it can stimulate the central nervous system or muscles, can make muscle fatigue recover, improve work efficiency, have a sober effect, and make the brain react lively and sensitive. In addition, by stimulating sympathetic nerve, asthma caused by parasympathetic nerve excitation can be suppressed.

Coffee also helps digestion, especially when eating meat, gastric juice is secreted more, which promotes digestion and prevents gastroptosis. Because caffeine can break down fat, many people must want to drink a cup of coffee after eating high-calorie food. However, research shows that the digestion of coffee will cause false hunger and may lead to an increase in food intake!