Fact checked by Nick Blackmer Caffeine stays in your system for up to 10 hours, with peak levels between 15 minutes and two ...

Enjoying decaf coffee could be good for your health—it could help protect against type 2 diabetes, liver disease, and heart ...

Chai and coffee both contain caffeine and energy-boosting compounds. However, they can affect your energy levels in different ...

Tea and coffee contain caffeine, antioxidants, and other beneficial nutrients. Both beverages offer potential health benefits ...

Add Yahoo as a preferred source to see more of our stories on Google. What a new study says about caffeine. (Getty Creative) (pixelfit via Getty Images) You may wake up in the morning desperate for a ...

If you're feeling anxious and having trouble sleeping, you may be taking in too much caffeine, or you may be a slow metabolizer.

Coffee can worsen the side effects of certain cold and flu medications. Learn more about these interactions here.

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 ...

Join Morgan on a two-day caffeine experiment that compares the effects of low-caffeine vs. high-caffeine coffee on daily ...

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 ...