ST. LOUIS, MO. -- Some doctors say sugar may be the number one killer in America right now. That may sound like a stretch, but you can see why they make that claim. Diabetes, heart disease, stroke, and obesity can all be partially attributed to too much sugar. Mike Norton, 51, had been an athlete most of his life. He thought he was doing everything right with diet and exercise, but then he suffered a heart attack just over five years ago.