In addition to helping you feel more alert, studies have shown coffee can benefit weight loss, boost workouts, decrease the risk of breast, colorectal and prostate cancer and contribute to a longer lifespan. “We are confident that coffee overall can be considered a healthy beverage, as part of an overall healthy diet,” says Dr. Edward Giovannucci, professor of nutrition and epidemiology at the Harvard School of Public Health. The Mayo Clinic notes that up to 400mg of caffeine a day (or roughly four cups of brewed coffee) is safe for most healthy adults. Just make sure you’re not turning your espresso or brew into a calorie-bomb with added sugars, syrups or creamers.