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O, The Oprah Magazine's Dr. David L. Katz, MD, talks about the importance of variety in our diet.

Four years ago, when Oprah managed to get down to a trim and fit 160 pounds, she thought she'd hit on a foolproof formula for permanent weight loss. Then life; in the form of a thyroid problem and a killer schedule; intervened.

O's ever-resourceful columnist is exhausted and smart enough to know that sometimes it takes a Kosovar village and an extended Colombian family to raise a 21st century woman.

O, The Oprah Magazine's Dr. David L. Katz, MD, explains how sugar and other sweeteners are different from each other and makes recommendations for eliminating excessive sweet-tasting food in our diet.