Caffeine blocks certain receptors in the brain that give it the command that it and the body are tired. This gives a false sense of cheerfulness, as the blocked receptors in turn send signals that provoke the release of dopamine.
Regular copious consumption of caffeine changes biochemical processes in the brain, leading to addiction, writes he althdigest.com. Because caffeine blocks adenosine receptors in the brain, it tries to produce more of them to replace the blocked ones. This mechanism may reduce the stimulating effects of caffeine, leaving you needing more and more cups of coffee to feel energized.
How do you know you are addicted to caffeine?
One of the most obvious signs that you have already become addicted to coffee is not so much the desire for more cups of coffee during the day, but the onset of a headache in the morning if you have forgotten to drink your coffee.
Headache is one of the signs that you are addicted to caffeine. If you miss drinking enough cups of coffee, especially the first morning, and then get a headache, this could be considered a sign of addiction.
Another sign of caffeine addiction is a lack of concentration. If you haven't had your coffee for the day, or you've had an unusually low amount for you, it's very likely that you're having difficulty doing normal daily tasks. Your memory and concentration may be struggling because the stimulant that used to help you is missing.
Your overall mood may be down if you haven't had coffee. Your energy is low, you're nervous, and you need coffee. These are all signs that you are more than a coffee fan.