We all know this person – do not speak to them until they have had a cup of coffee or an energy drink. Hot chocolate just won't do the trick. They will not be nice. They will not be alert. Proceed ...

For instance, sugary coffee drinks can cause a spike in blood sugar followed by a sharp drop, which may leave someone feeling ...

A staggering 94% of Americans use caffeine, 64% of whom do so on a daily basis. It’s the energy enhancer people start their ...

For most people, consuming some caffeine is harmless — but too much can be dangerous. Recent news coverage has raised questions about the amount of caffeine in some popular drinks and what consumers ...

Paraxanthine is the main metabolite of caffeine. Studies suggest it can boost alertness and focus, but the research base is ...

Could coffee help to counteract some of the effects of alcohol on the brain, and potentially limit the risk of addiction? That's what's suggested by a new study of how caffeine interacts with the ...

Were you tossing and turning last night and cursing yourself for the iced caramel macchiato you drank in the late afternoon? Do you worry about the amount of caffeine in a Mountain Dew? Caffeine is ...

Coffee's impact on sleep isn't straightforward habitual drinkers may adapt, showing little disruption, though timing and moderation still matter.

Mixing caffeine and alcohol may make you feel more alert, but it doesn't make you less intoxicated. Here's what to know.

Some claim it gives you energy and focus—without the jitters and crash.

Within 15 to 45 minutes of drinking a cup of coffee, caffeine travels through the bloodstream and reaches the brain. There, it blocks adenosine receptors, the neural “brakes” that help promote calm ...

Pre-workout supplements can support energy, strength, and endurance during exercise, but they also come with several potential side effects.