How much caffeine is in the coffee? Caffeine intake caffeine effect

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Caffeine is a xanthine alkaloid compound, a central nervous system stimulant that temporarily repels drowsiness and restores energy. it is used clinically to treat neurasthenia and coma resuscitation. Caffeinated coffee, tea, soft drinks and energy drinks sell very well, so caffeine is also the most commonly used psychotropic drug in the world.

In North America, 90% of adults use caffeine every day. Many natural sources of caffeine also contain a variety of other xanthine alkaloids, including cardiotonic theophylline and theobromine, as well as other substances such as tannic acid.

The main source of caffeine in the world is coffee beans (the seeds of coffee trees), which are also the raw materials of coffee. The caffeine content in coffee largely depends on the variety of coffee beans and the method of making coffee, and even the caffeine content of coffee beans in the same tree varies greatly. Generally speaking, the amount of caffeine in a cup of coffee ranges from 40 mg in espresso to 100 mg in espresso. Deep-roasted coffee generally contains less caffeine than light-roasted coffee because roasting reduces the amount of caffeine in coffee beans.

The caffeine in coffee is insoluble in cold water, but easily soluble in hot water. It will stimulate the cerebral cortex, eliminate drowsiness, enhance the sense of touch and thinking and adjust the function of the heart, but also dilate kidney blood vessels, diuresis and so on. However, caffeine is not limited to coffee. Usually a cup of 100cc coffee contains caffeine 60~65mg, green tea has 200~300mg, black tea has 350~400mg, and cocoa has about 100mg. Excessive caffeine intake is prone to tinnitus, hyperfunction of the heart (the heart beats rapidly, the number of pulses increases), and the pulse is uneven, so you must drink coffee in moderation.

Caffeine helps metabolism is a traditional type of substance that interferes with nerves and can make people more alert and refreshing, so it is a stimulant. Caffeine dilates the coronary arteries that supply oxygen to the heart, shrinks the blood vessels in the brain, and reduces the amount of blood that enters the brain, thus relieving pain. Most of caffeine is metabolized in the liver, but after drinking coffee, caffeine is distributed in all organs of the body.

A cup of coffee contains an average of 60 to 90 milligrams of caffeine, while the average human body consumes nearly 500 to 600 milligrams of caffeine a day without any side effects. Coffee, tea and Coca-Cola are not addictive. Although many people are used to drinking these drinks for a long time, they just like their taste and "refreshing" effect, and it is not difficult to really "give up".

Pregnant women's metabolism is relatively slow, so they should drink less coffee. Unlike smoking or drinking, drinking coffee does not have adverse consequences on fetal development and weight.

In the United States, a nearly decade-long survey of 85000 nurses found that moderate coffee consumption was not associated with the incidence of heart disease, nor with a variety of high blood pressure diseases.