Long considered a heathy beverage, tea could be coming up on nutritional superstar status. A study in the American Journal of Clinical Nutrition finds that the brew, especially those with caffeine and a high level of catechins like oolong, green, and white, may have a slimming effect. In fact, sipping tea regularly can speed calorie and fat burn—to the tune of an extra 100 calories a day, says Jeffrey Blumberg, Ph.D., director of the Antioxidants Research Laboratory at the Jean Mayer USDA Human Nutrition Research Center on Aging at Tufts University. Meanwhile, other research shows that all types of tea can protect against heart disease and certain cancers, while also improving your bone health. “The evidence suggests that the more you drink, the greater the benefit,” says Blumberg, “so drink…