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How much do you really know about the food you eat? Not as much as you might think.

Tanya Zuckerbrot MS, RD, is a  registered dietitian based in New York and the creator of F-Factor, a proprietary high-fiber nutrition program for weight loss, wellness and for treating various clinical conditions. In her ongoing "Truth About" series, she reveals the facts, myths and misconceptions behind everyday foods we know and love. Whether it’s sushi or salad dressing, milk or peanut butter, Zuckerbrot knows the scoop on the good, the bad and the ugly.

Use this series to help you make healthier, wiser choices in your diet and lifestyle, and for an in-depth examination of your favorite foods.