Medically reviewed by Jurairat J. Molina, MD Caffeine is a substance that raises alertness and boosts energy. Most adults can safely consume up to 400 milligrams of caffeine daily, equivalent to about ...

Why your morning coffee is making you more tired and this caffeine trap could be sabotaging your energy levels all day long ...

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Most medical professionals agree that moderate caffeine use isn't necessarily unhealthy. But, like other substances, caffeine ...

The impact of caffeine was especially strong in 20- to 27-year-olds, compared to middle-aged adults between 41 and 58. This difference may be due to changes in adenosine receptors in the brain.

Ants use chemical trails to lead their nest-mates to food. When one ant finds bait and remembers the way quickly, it lays a stronger trail, and more ants follow.

Caffeine blocks a chemical called adenosine, which is what normally makes you feel tired. That’s exactly why your morning Americano gives you that glorious alert-and-focused state of mind.

Increased Dopamine Levels In other cases, caffeine can boost your mental well-being. It boosts the flow of dopamine, a brain chemical that makes you feel happy and engaged with the world around you.

Caffeine blocks adenosine, the brain chemical that makes you feel tired. Less adenosine means more alertness, more focus, and a greater willingness to suffer.

After caffeine goes down your hatch, it heads for your brain. Once there, it blocks the adenosine receptors and— bam —your brain can’t detect the adenosine pinballing around up there.

Caffeine is a naturally occurring chemical known for its stimulating effect on the brain and central nervous system. It’s considered the “ most utilized psychoactive stimulant worldwide.” ...

Caffeine can increase alertness by blocking the effects of adenosine, a brain chemical that makes you feel tired. This also triggers the fight-or-flight hormone adrenaline, which is linked with ...