Coffee is a staple drink of the morning, particularly for people who are tired and need a boost of energy to get going. Coffee is valued for its stimulating effects, thanks to the high presence of caffeine in the drink. This directly affects brain function, but it does so in a chemical way -- there is no evidence to suggest that caffeine reduces blood flow to your brain.
Caffeine and the Brain
Caffeine is a stimulant. Stimulants have a direct effect on your central nervous system, including the brain. When caffeine is absorbed in the body, it is directed to the brain and runs its course there until being expelled through your urine. Caffeine is effective in boosting your mental focus and concentration, and it can make you more alert when you feel fatigued.
Blood Flow Effects
Medical experts have not identified a relationship between drinking coffee and changes to the blood flow to your brain. Although it is possible that changes to other functions of the body, such as blood pressure, may produce a secondary change in the blood flow your brain is receiving, this is a negligible change and the effects have not been supported by research.
Other Circulatory Effects
When you drink caffeinated coffee, the body's blood pressure experiences a short but steep rise in blood pressure, according to the Mayo Clinic. This is a temporary increase that subsides as the caffeine runs its course and leaves your system, and the long-term effects of caffeine on blood pressure are unknown. Coffee has also been shown to slow blood flow to the heart, but the research supporting this effect is limited, and further studies need to be done to conclusive determine the effects.
Considerations
Blood flow to the brain can be affected in other ways, particularly exercise. Working out increases blood flow to the brain and can improve mental function. Do not take caffeine before talking to your doctor if you have cardiovascular problems or are taking medications. Caffeine can sometimes interact badly with other chemicals. Stop using caffeine if you develop tremors or shortness of breath, and call your doctor to discuss your caffeine use.
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