Caffeine is the most popular legal stimulant in the world. A 2012 study showed that caffeine can protect your brain by changing it. Drinking coffee makes you more alert by blocking the adenosine neurotransmitters.

Scientists believe that in the long term, blocking adenosine receptors with caffeine can permanently change how these receptors work, and these changes could be the link between caffeine consumption and the cognitive protection it seems to offer.

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