Drinking too much caffeine can show up as fatigue, jitters, headaches, heart palpitations, and more. Experts recommend capping your caffeine intake at 400 milligrams a day. If you spot these warning ...

For many Americans, a morning routine is not complete without a cup of joe. The National Coffee Association reports the average American drinks just over three cups daily. And some people opt to get ...

While everyone’s tolerance is different, there is a limit to how much caffeine people can have in their systems. Jittery fingers and a racing heartbeat are common signs that you’re over-caffeinated.

Nick Blackmer is a librarian, fact-checker, and researcher with more than 20 years of experience in consumer-facing health and wellness content. Drinking too much caffeine can show up as fatigue, ...

While everyone’s tolerance is different, there is a limit to how much caffeine people can have in their systems. Jittery fingers and a racing heartbeat are common signs that you’re over-caffeinated.