It can be habit-forming, and it is possible to become dependent on it. When caffeine binds to these receptors, the brain doesn’t receive the signal that it’s time to rest. Caffeine also affects the brain, where it blocks the adenosine receptors that make us feel sleepy. This ultimately leads to an increase in the speed of your heart rate, the strength of your heart contractions, and the amount of oxygen and glucose in your blood. It stimulates the central nervous system and increases the production of certain hormones. Caffeine acts as a stimulant in the human body. It can also be found in some common medications and supplements. Image Credit: sulit.photos, Shutterstock How Does Caffeine Work?Ĭaffeine can be consumed in a variety of ways – including in coffee, tea, soft drinks, chocolate, ice cream, and energy drinks. Some researchers believe that caffeine could block a hormone. The blood pressure response to caffeine differs from person to person. It's unclear what causes this spike in blood pressure. Caffeine may cause a short, but dramatic increase in your blood pressure, even if you don't have high blood pressure. Around this same time, scientists discovered that caffeine is the chemical that produces the effects in the human body that we associate with drinking coffee. Answer From Francisco Lopez-Jimenez, M.D. Caffeine receptors were discovered in the human body in the 1950s.
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