Research shows that drinking coffee can quickly lift your spirits and improve work efficiency.

Coffee is arguably the most widely used natural neurostimulant in the world. Having a cup of coffee every morning makes people feel refreshed, thus improving work efficiency and performance, which has also been confirmed in scientific experiments. Coffee does improve people's ability to process information, according to a study.

A team led by psychologist Thaddeus T. Bruny é of Tufts University (Tufts University) in Massachusetts conducted a comparative experiment on two groups of people to study the effects of different doses of caffeine on people's ability to read and proofread articles. This is part of a large research project on stimuli and cognitive behavior. The first group of 36 subjects drank only half a cup of coffee a day, while the second group selected people who drank about three cups (8 ounces each) of coffee a day. Forty-five minutes before the test, the researchers randomly gave subjects four different doses of caffeine capsules: 0 mg, 100 mg (equivalent to 8 ounces of coffee), 200 mg (equivalent to 16 ounces of coffee) and 400 mg (equivalent to 20 ounces of coffee). Then they were asked to read a page of the news story within five minutes and find spelling and grammatical errors in the article. The results showed that caffeine intake had no effect on the subjects' ability to find spelling mistakes. However, it is helpful for subjects to identify "complex overall errors" (Complex global errors), such as active word consistency and verb tenses. People in the first group who consumed low levels of caffeine performed best after taking 200 milligrams of caffeine, while those who consumed heavy coffee on weekdays performed best after taking 400 milligrams of caffeine.