Caffeine is generally safe to drink up to 400 milligrams a day, according to the Food and Drug Administration (FDA). That's equivalent to about four or five cups of coffee. For the average person, ...

And there are plenty of perks associated with your morning cup—research shows coffee may even slow biological aging. But ...

Few choices feel as critical as the one concerning what beverage to consume at 2 p.m., a time of day when ordering cold brew feels a bit like playing Russian roulette with my sleep schedule, but going ...