Is sugar a toxin that's fueling the global obesity epidemic? That's the argument UCSF's Dr. Robert Lustig made in Sugar: The Bitter Truth, a 2009 UCTV video that's since gone viral and sparked a national dialogue. In The Skinny on Obesity, a 7-part series from UCTV Prime, Dr. Lustig and two of his UCSF colleagues tease out the science behind this alarming claim and the dire thr...