Caffeine can sometimes be too much for your body to handle, causing side effects like jitters and dehydration. Luckily, there ...

Medically reviewed by Elizabeth Barnes, RDN Key Takeaways Too much caffeine can cause unwanted side effects. High intake or ...

Lean into your health goals and personal preferences when deciding between green tea and black coffee for your morning ...

Learn what happens when you drink coffee on an empty stomach and possible side effects experts warn about.

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 ...

In a recent study published in PLoS One, researchers compared the effects of caffeine and aerobic exercise on mental fatigue ...

A cup of coffee can be the perfect pick-me-up, giving you a quick boost of energy on a slow afternoon. But how long does caffeine stay in your system and can it affect you even hours after consumption ...

Separating your magnesium supplement from your morning pick-me-up helps more of the mineral stay in your body and may lower ...

Consumer Reports analyzed caffeine levels in both instant coffees and takeout brews — and found they can vary widely. In some ...