Edit: It depends on how the bacon was processed see this post.
That is what the Weston A. Price Foundation says, and I agree with them. Their mission is to share the research of Dr. Weston A. Price, a Dentist who did comparative studies of people eating traditional whole foods diets, with those eating more modern refined diets. He found that people who ate traditional whole foods, and high quality animal foods had fewer cavities, did not need braces and were much healthier. They also had less heart disease, cancer, arthritis, and childbirth problems. The foundation is a fabulous resource for information about the dangers of soy, the benefits of raw milk, fat-soluble vitamins A, D, and K, and finding high quality nutrient dense foods. Please check them out at www.westonaprice.org. They publish a fascinating journal 4 times a year with great research and information. I have copies in my office you are welcome to borrow. If you join the foundation you will receive the journal for free, and from now until the end of the year they have a special bonus of $100 in coupons towards very high quality products for your health with membership.