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Dr. Phil McGraw serves up food for thought on the subject of weight in America in a “town meeting” forum with host Katie Couric, and in taped segments, illustrating issues raised in his book on the subject, “The Ultimate Weight Solution: The 7 Keys to Weight Loss Freedom.” McGraw isn't promoting any particular diet; instead, his message focuses on “how you think about food and the role food plays in your life,” says producer Deborah Trueman. “It's about the survival of the fittest.”