The U.S. Food and Drug Administration (FDA) advises that most adults should limit their caffeine intake to 400 mg per day, ...

This makes people able to drink more coffee without making them hyper or jittery.' Coffee also affects people differently depending on how often they drink it. Regular coffee drinkers tend to be ...

“Caffeine content varies between beans and brew methods, so be mindful of your daily total,” Sullivan said. Exceeding the ...