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Many Americans would do practically anything to get rid of their body fat. Yet fat is necessary for the body to function. On today's edition of Please Explain, a look at the good, the bad, and yes…the ugly...of fat. We'll talk to Dr. Sharon Akabas, PhD, Associate Research Scholar and director of M.S. in Nutrition for Health Professionals at Columbia University's Institute of Human Nutrition, and Dr. David Katz, MD, MPH, FACPM, FACP, an obesity researcher and Associate Professor of Public Health, and formerly the Director of Medical Studies in Public Health, at the Yale University School of Medicine.