Robert Lufkin, MD, has served as full professor at both the UCLA and the University of South California Schools of Medicine. In addition to being a practicing physician, he is author of over 200 peer reviewed scientific papers. Among his many inventions including several patents in artificial intelligence, he developed an MR-compatible biopsy needle which is used worldwide today as the ""Lufkin Needle."" Dr. Jason Fung, M.D., is a physician, author, and researcher. His science-based books about diabetes and obesity, The Diabetes Code, The Obesity Code and The Complete Guide to Fasting have sold hundreds of thousands of copies and challenged the conventional wisdom that diabetics should be treated with insulin. He is also the co-founder of the Intensive Dietary Management Program, North America's leading clinic to help people lose weight and reverse Type 2 Diabetes naturally with fasting. His work on fasting has been cited by CNN, TIME, the Atlantic, Forbes, The Toronto Star and many other media outlets.