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BEFORE: Janelle Winfield was overweight her whole life before she enlisted in the Knockout Obesity diet. Zandy Mangold

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AFTER: Winfield lost 48 pounds! She KO’d butter and fried food, in favor of bok choy. David Resenzweig

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BEFORE: Restaurant co-owner Dimitri Verteouris Food Network

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AFTER: Verteouris turned his weight loss into a gain for others by developing an intense exercise and diet regimen. David Rosenzweig

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BEFORE: Lorraine Frazier dieted over the years, but never lost much weight. Zandy Mangold

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AFTER: Frazier lost 38 pounds. David Rosenzweig

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BEFORE: Tommy Hondros’s weight yo-yo’d for years. Zandy Mangold

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AFTER: Hondros lost 19 pounds. David Rosenzweig

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BEFORE: Delen Parsley let his weight spiral out of control for years, but as a new dad to an 8-month old son, he knew that it was time to drop the weight. Zandy Mangold

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AFTER: Parsley lost 44 pounds. David Rosenzweig

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BEFORE: Andy Jimenez says he did not eat a green vegetable until he was a teenager. Zandy Mangold

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AFTER: Jimenez lost 54 pounds. David Rosenzweig

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