First of all, 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.
Second, the shortcomings of coffee
1, people who are used to drinking a lot of coffee 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.
3, drinking coffee will cause people's mental excitement, and caffeine will affect sleep within 4 hours after drinking coffee.
Third, it is not suitable for the crowd.
Suffering from hypertension, coronary heart disease, arteriosclerosis and other diseases-drinking coffee for a long time or in large quantities can cause cardiovascular diseases.
Older women-coffee can reduce calcium and cause osteoporosis. After menopause, women need to supplement ten times as much calcium every day.
Patients with stomach trouble-drinking too much coffee will make stomach trouble worse.
Pregnant women-drinking too much coffee can lead to fetal malformation or miscarriage.
Vitamin B 1 deficiency-vitamin B 1 can keep the balance and stability of the nervous system, and coffee can destroy it.
Cancer patients-too much caffeine is dangerous for normal people.
Fourth, matters needing attention
Remember that coffee can't be drunk with tea at the same time. Tannic acid in tea and coffee can reduce iron absorption by 75%;
Tannic acid in tea and coffee will reduce calcium absorption. Therefore, it is best to choose the time for drinking tea and coffee between meals;
Caffeine-containing drinks and foods can cause nausea, vomiting, headache and rapid heartbeat when consumed in large quantities by pregnant women. Caffeine will 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 will 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.
Strong tea, coffee and carbonated drinks are also risk factors for the formation of digestive tract ulcers; Therefore, patients with stomach diseases should not drink more coffee;
Coffee drinks contain caffeine, which is easy to cause tinnitus;
Coffee should not be eaten with ibuprofen. Ibuprofen is a commonly used antipyretic, analgesic and anti-inflammatory drug, which can stimulate gastric mucosa, while some caffeine in coffee and cola can also stimulate gastric mucosa and promote gastric acid secretion. If you drink coffee and cola immediately after taking ibuprofen, it will aggravate the irritation to gastric mucosa.
It is not advisable to smoke immediately after drinking coffee. Some components in coffee combine with cigarettes to produce carcinogens.