For decades, health-minded consumers have sought alternatives to natural sugar -- aspartame, marketed under any number of brand names, is one of the most popular artificial sweeteners in the world. Yet it appears this billion-dollar industry may have a dark side: for many years, critics alleged aspartame may be responsible for any number of dangerous side effects. And, just recently, the World Health Organization released a groundbreaking statement alleging this substance may be carcinogenic. So what's going on, exactly? Tune in to learn more.