Caffeine

It may sound counterintuitive, but people who are supersensitive to coffee's bitter taste actually drink more of it, a new study finds.

Some diet supplements that contain caffeine claim that the compound helps reduce appetite. Does it?

A new report divides coffee lovers into three groups depending on how their bodies respond to caffeine, but does science really support this conclusion?

Caffeine can perk you up, but exactly how much caffeine should you consume – and when should you take it – to achieve "peak" alertness?

Would you gain 25 hours of energy? Or would the consequences be more severe?

Coffee acts on the same system in the body as marijuana does.

Hot tea may do more than warm your insides: Drinking at least one cup of caffeinated tea a day may lower a person's risk for glaucoma, a new study suggests.

A company that claims to make one of the strongest coffees in the world is recalling some of its products because they could pose a risk of serious illness.

What happens when you combine caffeine and marijuana?

People who drink coffee live longer, new studies find.

A teen in South Carolina has died after drinking three caffeinated beverages in a short period of time.

Consuming energy drinks may be particularly risky for people with a certain genetic heart condition, a new study from Australia suggests.

Drinking coffee may reduce the inflammatory processes that naturally come with age, researchers said.

If one cup of coffee keeps you perked up all day, you may be able to thank your genes for that long-lasting caffeine kick, a new study finds.

A previously healthy 28-year-old man wound up in the emergency room with heart problems after drinking two energy drinks a day for months.

Casual exercisers will not benefit from workout supplements, but creatine, caffeine or beta-alanine can benefit intense workouts.

People who don't get enough sleep for several days in a row can't rely on caffeine to give them a mental boost, new research finds.