Discover how big of a difference caffeine makes.

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 ...

Lindsey DeSoto, RD, is a nutrition writer, medical reviewer, and registered dietitian who helps clients improve their diet for health-related reasons. Her writing covers a variety of topics, including ...

We tested ground coffees purchased from local supermarkets across Connecticut, New Jersey, New York, and online, including blonde to dark roasts, some flavored, three instant, and one espresso-style.