22 December 2006 - The artificial sweetener, aspartame, is the bedrock of the diet industry. Found in everything from fizzy drinks to vitamin pills and marketed under a variety of different names, it is difficult to detect and even harder to avoid. But how safe is it? Does it really cause brain tumours, blindness and other serious illnesses? First part of this shocking documentary which investigates how the FDA came to approve such a potentially dangerous product.