To some, coffee is an essential drug of sorts: a jolting liquid that staves away fatigue, headaches, and lack of motivation. Or perhaps you’re a recovering coffee addict who has now turned to the soothing varieties of tea to get a decent caffeine fix, just without the jitters. Of course, coffee sometimes sounds more like

Nutrition and Exercise Metabolism, found that trained athletes who took in caffeine pre-exercise burned about 15% more calories for three hours post-exercise, compared to those who ingested a placebo. The dose that triggered the effect was 4.5 mg of caffeine per kilogram of body weight. For 150-pound woman, that’s roughly 300 mg of caffeine, the