1. Refreshing: Caffeine stimulates the central nervous system, which can make the mind clearer, have rich thinking ability, pay attention to concentration and improve work efficiency;

1. Strengthening bones and muscles, benefiting waist and knees: Caffeine can make muscles contract freely and improve motor function.

3. appetizing digestion: caffeine stimulates gastrointestinal secretion of gastric acid, which can promote intestinal peristalsis, help digestion, prevent gastroptosis, and have a rapid laxative effect.

4. Liqiao Qushi: Caffeine can promote renal function, discharge excess sodium ions in the body, increase urine output and improve abdominal distension and edema.

5. Promoting blood circulation and removing blood stasis: Linoleic acid contained in coffee has the functions of hemolysis, preventing thrombosis, enhancing vasoconstriction, relieving migraine and reducing the probability of stroke.

Pingfei Dingchuan: Caffeine can inhibit parasympathetic nerve and reduce the attack of asthma.

⒎ Dehumidification: Caffeine contains tannic acid, which has a strong adsorption capacity for taste.

⒏ Weight loss effect: Drinking coffee will lose weight, and the best time to take it is 30 minutes after lunch to 1 hour and before going to work, while tasting a cup of rich sugar-free black coffee combined with walking can promote fat burning.

Black coffee can effectively improve hypotension.

shortcomings

1. Excessive drinking of black coffee may increase the risk of myocardial infarction.

2. Drinking a lot of caffeinated drinks for a long time will lead to stomach trouble.

3. Caffeine will shrink (narrow) the microvessels of the eyes, thus reducing the nutrients entering the cells of the eyes, and also reducing the speed of removing waste from the eyes.

Matters needing attention in expanding data

1. Remember that coffee should not be drunk with tea. Tannic acid in tea and coffee can reduce the absorption of iron by 75%. It is advisable to take warm boiled water.

2. Tannic acid in tea and coffee will reduce the absorption of calcium. Therefore, it is best to drink tea and coffee between meals.

3. Caffeine-containing drinks and foods can cause nausea, vomiting, headache, and rapid heartbeat after being drunk in large quantities by pregnant women. Caffeine can also enter the fetus through the placenta, affecting fetal development.

Many doctors believe that drinking 1~2 cups (6~8 ounces each) of coffee, tea or carbonated drinks every day will not affect the fetus. But for the sake of caution, it is best for pregnant women to ban it. Caffeine can lead to an increase in abortion rate, so drink decaffeinated drinks.

Children should not drink coffee. Caffeine can excite children's central nervous system, interfere with children's memory and cause ADHD.

Baidu encyclopedia-black coffee

People's Network-Coffee affects 6 parts of the body. 7 taboos for drinking coffee carefully.