Learn how caffeine affects brain chemicals and health, sleep, and mood. Understand safe daily limits, hidden sources, and signs you’re getting too much.

Daily caffeine consumption may reduce the risk of liver scarring, but sugar and cream can negate the protective benefits of ...

Could coffee be the liquid key to longevity? A new study reports that the world’s most widely used stimulant can extend lifespan and affect how cells respond to genetic damage — though there’s a ...

A recent review of animal research suggests that caffeine might help ease symptoms of anxiety and depression by reducing inflammation in the brain. The researchers analyzed multiple experiments and ...

Medically reviewed by Kristie Reed, PharmD Key Takeaways Green tea extract and caffeine together can boost focus and mental ...

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 ...

A new study reveals that certain caffeine metabolites in urine are linked to diabetic retinopathy risk in men, offering a promising path toward noninvasive biomarkers for early screening and disease ...