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

We tested the levels of caffeine and contaminants in brews from Dunkin', Folgers, Starbucks, and more. Some will wake you up—or keep you up—more than others. By Janet Lee Whether you drink coffee to ...

Drinking coffee too late can disrupt sleep. The best time to drink coffee varies based on genetics and caffeine sensitivity.

Whether you drink coffee to jump-start your day or just because you enjoy it, the habit has some real health benefits, including for your heart and brain. But too much caffeine—more than 400 mg per ...