Do you like to stay up late for coffee? You must know the taboo of drinking coffee.

Coffee is one of the three major drinks in the world. with the development of the times, it is no longer a drink in western countries, and many people in our country also like to drink coffee. However, it is well known that the harm of coffee exists, do not drink too much coffee every day, you should control the amount. So, how many cups of coffee are most appropriate to drink every day?

1 cup of coffee

The upside: Greek researchers studied 485 people over the age of 65 and found that one cup of coffee a day can keep arteries healthy and stabilize blood pressure. A survey of 600 volunteers at the University of Bristow in the UK also showed that one cup of coffee a day can boost brainpower.

The downside: it takes eight hours for caffeine to be fully excreted, so if you drink coffee after 3 or 4 p.m., it's easy to have sleep disorders.

2 cups of coffee

Benefits: a study by the University of Florida found that 200 milligrams of caffeine, equivalent to two cups of coffee, can prevent memory loss and Alzheimer's disease. Research in the International Journal of Sports Medicine also shows that drinking coffee 30 minutes before exercise can help improve performance.

The downside: if you are pregnant, you should consume less than two cups of coffee, otherwise it will increase the risk of miscarriage.

3 cups coffee

Benefits: a study published in the American Journal of Chemical Medicine found that three cups of coffee a day reduced women's risk of ovarian cancer by one percent. Men who drank three drinks a day had a 40% lower risk of gallstones.

The downside: a 2006 study in the United States showed that three cups of coffee a day increased heart rate and blood pressure slightly, which may increase the risk of heart attack.

4 cups coffee

The upside: a study by the University of Utah found that four cups of coffee contained about 400 milligrams of caffeine, which reduced the risk of oral and throat cancer by 39 percent. In addition, it can reduce the risk of colon cancer, breast cancer and type 2 diabetes.

The downside: four cups of coffee a day doubles the risk of rheumatoid arthritis.

More than 5 cups

The upside: a 10-year study of 90,000 people by researchers in Tokyo found that five cups of coffee a day reduced the risk of liver damage by three to four.

The downside: caffeine interferes with calcium absorption and increases the risk of osteoporosis. Drinking too much will accelerate the loss of minerals and vitamins in the body. While increasing high blood pressure, it also increases the risk of cardiovascular disease.

Next, let's take a look at the taboos of drinking coffee.

The taboo of drinking coffee

Remember that coffee should not be served with tea. Tannic acid in tea and coffee reduces iron absorption by 75%. It is appropriate to use warm boiled water to deliver the service.

The tannic acid in tea and coffee reduces calcium absorption. Therefore, it is best to choose between two meals for tea and coffee.

Caffeinated drinks and foods can cause nausea, vomiting, headache and rapid heartbeat after being consumed by pregnant women. Caffeine also enters the fetus through the placenta, affecting fetal development.

Many doctors believe that pregnant women drink 1 to 2 cups of coffee, tea or carbonated drinks a day (6 to 8 ounces each), which will not affect the fetus. But as a precaution, pregnant women had better forbid it. Caffeine can lead to an increase in the abortion rate, so you should drink non-caffeinated drinks

Coffee is not suitable for children. Caffeine can excite the central nervous system of children, interfere with their memory and cause ADHD.

Strong tea, coffee and carbonated drinks are also risk factors for digestive tract ulcers; therefore, patients with stomach diseases should not drink more coffee.

Coffee drinks contain caffeine, so it is easy to cause tinnitus.

Coffee cannot be eaten with ibuprofen. Ibuprofen, a common antipyretic, analgesic and anti-inflammatory drug, has a stimulating effect on 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 stimulation of gastric mucosa.

It is not advisable to smoke immediately after drinking coffee. Some ingredients in coffee combine with cigarettes to produce carcinogens.

For the sake of health, it is very important to drink coffee scientifically.