Sugar
Some brands load their yogurt with sugar. Yogurt naturally contains about 11 grams of sugar per 1-cup serving, but many of the flavored varieties in the grocery store contain twice that amount. Often fruit-flavored yogurt is enhanced not with actual fruit but sugar-laden syrups or concentrates. Not only do these pack on extra calories, but a diet high in sugar also can increase your triglyceride levels. Check labels to be sure, but generally, "light" varieties of yogurt use artificial sweeteners and will have a lower sugar content. Better yet, you can buy plain yogurt and sweeten it yourself with fresh fruit or a small amount of honey or table sugar.