New research that looked at more than 135,000 people over the course of 22 years has indicated that people who eat bacon five times a week or more are almost 60 percent more likely to develop bladder cancer. The study also showed that those who ate skinless chicken with a similar frequency had a 52 percent greater risk of developing the illness.
Nitrosamines, which are present in some meats, including bacon, are known to cause bladder cancer. But most studies on the subject before this one did not attempt to determine the effects of different kinds of meat.
Heterocyclic amines, which are carcinogenic chemicals formed when meat is cooked at high temperatures, are also a likely causative factor. Cooked chicken with skin is known to contain a smaller amount of heterocyclic amines than skinless chicken.
People who frequently indulged in bacon and other processed meats were also more likely to smoke and less likely to exercise.