GMA's Tory Johnson discusses weight battle

NEW YORK

Johnson lost 72 pounds in the last 20 months. She says she had been overweight since second grade; forging notes to get out of Physical Education classes and wearing a blue wedding dress to hide her size. Johnson also avoided the doctor for 10 years.

Johnson revealed her life-changing moment came when her boss suggested a wardrobe makeover. She then decided to make a permanent lifestyle change.

She reveals more keys to her success in her new book, "The Shift: How I Finally Lost Weight and Discovered a Happier Life."

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