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.

Extended data:

The benefits of coffee:

1, coffee has the function of diuresis and dehumidification. Caffeine can promote renal function, expel excess sodium ions from the body, increase urine output, improve abdominal distension and edema, and help to lose weight.

2, coffee can be appetizing staple food. Caffeine can stimulate sympathetic nerve, stimulate gastrointestinal secretion of gastric acid, promote digestion, prevent abdominal distension and gastroptosis, and promote gastrointestinal hormones and peristalsis hormones, thus quickly relieving constipation.

3. The whitening effect of coffee. So drinking a cup of black coffee after a meal can effectively whiten the skin. In addition, black coffee also has diuretic effect. Black coffee can also promote cardiovascular circulation. For women, black coffee has a cosmetic effect. Drinking it often will make you radiant and radiant. People with low blood pressure can get better by drinking a cup of black coffee every day. In the process of brewing coffee at high temperature, it will also produce an antioxidant compound, which is helpful for anti-cancer, anti-aging and even prevention of cardiovascular diseases, and can be comparable to fruits and vegetables.

4, coffee can extinguish the wind and stop convulsions. Coffee can increase high-density cholesterol, accelerate the metabolism of bad cholesterol, reduce coronary atherosclerosis and reduce the probability of stroke.

Coffee contains some nutrients. Nicotinic acid in coffee contains vitamin B, and roasted coffee beans have higher content. But also free fatty acids, caffeine, tannic acid and so on.

6. Coffee is good for the skin. Coffee can promote metabolic function, activate digestive organs and play a great role in constipation. Bathing with coffee powder is a kind of hyperthermia, which has the function of losing weight.

References:

Baidu encyclopedia-coffee

References:

People's Network-Coffee is delicious, but it should be moderate.