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 ...

Many people say drinking regular coffee makes them feel wired, anxious, or ultra-jittery. But for those of us who love the taste of coffee and the ritual behind it, quitting this addictive beverage ...

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

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 ...

Learn how caffeine affects brain chemicals and health, sleep, and mood. Understand safe daily limits, hidden sources, and signs you’re getting too much.

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

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 ...

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 ...

Medically reviewed by Jonathan Purtell, RDN Key Takeaways Mixing caffeine with alcohol may increase alertness, but your blood alcohol level and impairment stay the same.Combining the two can also ...

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

A cup of coffee or tea in the morning or an afternoon caffeine pick-me-up is usually fine for most adults. But parents might want to take a closer look at caffeine and other ingredients in the drinks ...