Three cups of coffee a day will slightly increase heart rate and blood pressure, which may increase the risk of heart attack. Drinking four cups of coffee a day will increase the risk of rheumatoid arthritis 1 times. Caffeine can interfere with calcium absorption and increase the risk of osteoporosis. Drinking too much will accelerate the loss of minerals and vitamins in the body. While raising blood pressure, it will also increase the risk of cardiovascular disease.

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

Extended data

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.

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