Guide Note: Bob Greene is a world famous fitness expert, dietician, and author. He is best known for his work with Oprah Winfrey, and his book The Best Life Diet. He and Mehmet Oz often appear as contributors and experts on her television program. He has taken his book and expanded it to a branded "life style" program. He adds his "best life" seal to hundreds of items in the supermarket that he deems worthy of his program.