Processed meats like ham, bacon, and sausage
The World Health Organization says processed meats like hot dogs, ham, bacon, and sausage can cause cancer. That’s because the meat has been treated in some way to preserve or flavor it, such as by salting, curing, fermenting, or smoking. The WHO says it’s possible that any kind of red meat could be linked to an increased risk of colorectal cancer, and there’s some evidence to suggest it also contributes to pancreatic and prostate cancers, though that evidence is not as strong.