Those who drink coffee in the morning can't help but often drink coffee to cheer him up.

Many people like to drink a cup of coffee or tea in the morning to help them get rid of their tiredness. However, a study conducted by British scientists shows that this method does not work for those who regularly drink caffeinated drinks such as coffee and tea.

Caffeine stimulates the nerves to achieve an exciting effect. Researchers at the University of Bristol in the UK have found that people who regularly drink caffeinated drinks gradually become "resistant" to this stimulating effect.

The researchers surveyed 379 adults, half of whom never or rarely drank caffeinated drinks, while the other half regularly drank such drinks. The researchers asked them not to drink caffeinated drinks for 16 hours, followed by coffee or a placebo with no actual effect.

After evaluation, the researchers found that regular caffeinated drinkers were as excited after drinking coffee as those who rarely drank coffee after drinking placebos.

The researchers believe that "people who regularly drink caffeinated drinks feel that caffeine excites them, and the effect of drinking coffee, tea or other caffeinated drinks in the morning is particularly obvious." long-term use of caffeine tends to make people feel tired, and drinking coffee in the morning makes people who regularly drink caffeinated drinks get their excitement level back to the level of ordinary people.