Dr. Richard Johnson has been a practicing physician and clinical research scientist for more than twenty-five  years. He  has published hundreds of  papers and lectured in over forty-five  countries. He is the author of three books, including  The Sugar Fix,   The Fat Switch, and  Nature Wants Us to Be Fat.  
Timothy Gower  is a freelance writer whose work has appeared in many publications, including  Prevention, Reader' s Digest, Esquire, Fortune, Health, Men' s Health, Better Homes and Gardens,   The  New York Times, and  Los Angeles Times. He is also the author of five books. He resides in Massachusetts.