Bill Clinton, at 65, has become the Blurber-in-Chief, an activist health convert who has enthusiastically endorsed three diet books: Eddie Shapes Up by Ed Koch, Think and Grow Thin by weight-loss coach Charles D’Angelo, and The Blood Sugar Solution: The UltraHealthy Program for Losing Weight, Preventing Disease, and Feeling Great Now, a new book by Dr. Mark Hyman. No more “Fat Elvis” jokes for Bill.