Caffeine is a naturally occurring stimulant often found in coffee, tea, chocolate and various energy drinks and medications. But how does caffeine impact the body? Let’s take a system- by-system look ...

A new study found that pre-exercise caffeine can enhance sprinting power for at least 3.5 hours. Learn how to time your ...

Cutting back can make you feel worse before it makes you feel better.

This is Part 1 of a series. To read part 2, click here. “To die, to sleep—to sleep, perchance to dream—ay, there’s the rub, for in this sleep of death what dreams may come....” —Shakespeare’s Hamlet ...

"Coffee just doesn't have much effect on me," says 20-year-old Emily, who is leaving a cafe in central London at 18:00 BST. "I'll normally have two cups a day and then maybe an energy drink too. And ...

From espresso to energy drinks to supplements, caffeine comes in many forms, Rula notes. And if you're like most people, you probably enjoy a cup of coffee each morning or a late-afternoon soda to ...

Caffeine can help or worsen headaches depending on individual tolerance and intake patterns. Dehydration from caffeine's ...

Coffee is a common ingredient in many chocolate desserts, including brownies and cake. But how much caffeine remains after ...

Low doses of caffeine as little as 100 mg may impact deep sleep, while consuming caffeine in the morning may also affect sleep quality at night, a review finds.

Caffeine is one of the most widely used performance-enhancing supplements in sports. Despite its established benefits, how ...