When to drink coffee is the most refreshing coffee common sense

For coffee lovers, some people are used to having a cup in the morning, while others like to drink it in the afternoon. Caffeine interacts with the human hormone cortisol to produce a better pick-me-up, and the best time to drink coffee is between 09:30 and 11:30, according to the cycle of changes in cortisol levels, a US neuroscientist has found.

The effect of caffeine interacting with an important hormone in the human body (cortisol, also known as hydrocortisone) reached its optimal state during this period. Cortisol helps the body regulate its own biological clock and improve alertness. Cortisol levels peak shortly after people wake up, and the peak lasts for up to an hour, averaging between 8: 00 and 9: 00 in the morning. The researchers believe that drinking coffee after this peak is better because it boosts the production of cortisol when it decreases.

Coffee contains caffeine, which excites the sympathetic nerves after entering the body, thus eliminating drowsiness, improving blood circulation, and the body also feels warm and does not feel tired, so it has a "refreshing" effect.

Caffeine continues to accumulate, which can counter the body's drowsiness. The more caffeine you accumulate, the more you can stay awake. White, director of the Center for Sleep Diseases at Roche University in Chicago, who led the study, said drinking more at a time is better than drinking a lot of coffee in the morning.

"most intellectuals use coffee the wrong way," he said. Drink a few cups of coffee or tea in the morning, or three cups of coffee on the way to work. This means that the amount of caffeine in their brains decreases over the course of the day, usually in the afternoon when there is something important to boost their spirits, when there is less and less caffeine. "

Coffee is the most consumed beverage in the world today. In recent years, the number of people drinking coffee in China is increasing day by day. Many women entrepreneurs, businessmen, publicists and trendy women are keen on drinking coffee because of their work and social needs. However, relevant people in the medical profession believe that women should not drink more coffee, and drinking more coffee is harmful to women's health.

The researchers studied men living in private suites for 29 days. None of the subjects could tell the time sooner or later. The researchers kept them awake for 29 hours, simulating situations in which some doctors, soldiers and emergency workers needed to stay awake for a long time.

The study showed that subjects who took one caffeine pill equivalent to 60 milliliters of coffee per hour did better on the test than those who took a placebo. People who take caffeine pills will also feel more sleepy when it's bedtime.

Coffee is a fashionable drink in modern life. Its main ingredient is caffeine that excites the brain. It also contains fat, protein, carbohydrates, inorganic salts and vitamins. Most instant coffee contains 3% to 4% caffeine, and a cup of brewed coffee contains about 150 milligrams of caffeine. The advantage of drinking coffee is to lift your spirits, but drinking too much coffee can cause illness.

Expert analysis: White pointed out: "although sleep is irreplaceable, but our study found that in order to stay awake and focused, especially to stay awake for more than 16 hours, drinking a small amount of coffee is a better way."