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."