Caffeine in coffee is a mild stimulant, which can improve human sensitivity and attention, accelerate human metabolism, improve people's mental state and physical quality, and thus eliminate fatigue.

Never drink coffee on an empty stomach, because coffee will stimulate gastric acid secretion, especially for patients with gastric ulcer.

Extended data:

Precautions for drinking coffee

1, don't drink a lot of coffee to refresh yourself in a short time, which is equivalent to drinking a lot of stimulants, which may lead to heart failure and pathological changes.

2, don't drink coffee immediately, otherwise it will accelerate the dehydration of the body, which is more likely to cause high blood pressure.

3. If you drink coffee, try to choose something light. Don't drink too strong coffee. Strong coffee will make people drier and reduce their judgment and understanding.

Don't drink coffee continuously for a long time, because drinking coffee can also be addictive. Once you drink coffee continuously for too long, you will become dependent and have a bad influence on your spirit.

References:

Coffee-Baidu Encyclopedia