Yogurt can be a great health food. It is rich in calcium, which helps prevent bone loss and osteoporosis. It also contains healthy bacteria, called probiotics, that keep your digestive tract in tip top shape, lowering risks for everything from diarrhea to colon cancer. But, the flavored or fruited yogurts have the sugar equivalent of a candy bar and the designer yogurts with made-up bacteria names are just expensive hype. Save your money and buy plain, nonfat yogurts that contain the tried-and-true bacteria, such as L. acidophilus. Then flavor it at home with some jam or fresh fruit.