Colon cancer used to be a disease of retirement age. Now it's killing men under 50 faster than any other cancer, and women aren't far behind. Researchers at Massachusetts General Brigham spent two decades following female nurses to understand why, and their findings point directly at the contents of America's shopping carts. A study tracking nearly 30,000 female nurses over 24 years found that women who consumed the highest amounts of ultra-processed foods faced a 45 percent