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RIDGEWOOD, NJ - JANUARY 19: Kym Johnson signs copies of her new book "The 5678 Diet" at Bookends Bookstore on January 19, 2016 in Ridgewood, New Jersey. (Photo by Dave Kotinsky/Getty Images)

RIDGEWOOD, NJ - JANUARY 19:  Kym Johnson signs copies of her new book "The 5678 Diet" at Bookends Bookstore on January 19, 2016 in Ridgewood, New Jersey.  (Photo by Dave Kotinsky/Getty Images)