Some people feel their body becomes tired after drinking coffee because the caffeine content in coffee blocks adenosine receptors in the brain.
antvklik.com – The caffeine found in coffee is the most consumed stimulant in the world. The habit of drinking coffee is often done by many people to increase energy and concentration. Even so, the effect will be different for each person, even if the amount of caffeine consumed is the same.
Some people, for example, can drink several cups of coffee during the day and experience little effect. While some other people may experience side effects immediately after consuming one cup of coffee.
Reporting from Medical News, according to the Food and Drug Administration (FDA) an average 8 ounce or 25 milliliter cup of coffee contains about 80-100 milligrams (mg) of caffeine.
The caffeine in coffee sometimes affects the body and can cause fatigue after the effects of caffeine wear off. The reason why drinking coffee can make someone feel tired is because caffeine blocks adenosine receptors in the brain.
Adenosine is a brain chemical that affects the sleep-wake cycle, so adenosine levels increase during waking hours and decrease during sleep. To slow down brain activity in preparation for sleep, adenosine molecules bind to special receptors in the brain. However, caffeine prevents this from happening by binding to adenosine receptors.
The body can immediately feel the effects of caffeine, because the body quickly absorbs caffeine. Then a person’s level of fatigue can be different, because there are people who have built a tolerance to caffeine.
Usually this is because the person is accustomed to consuming caffeine regularly. So, the body will produce more adenosine receptors to counter the effects of frequent caffeine consumption. That’s how caffeine blocks adenosine receptors.
Another reason the body becomes tired is because of the presence of caffeine which can increase blood sugar levels, because compounds in coffee can increase glucose metabolism and reduce the risk of type 2 diabetes. However, the effect of coffee on blood sugar levels is still a matter of controversy for researchers to date.