In a new study, researchers from the Harvard School of Public Health (HSPH) have found that eating a daily serving of processed meat, such as bacon, sausage, hot dogs, or processed deli meats, was associated with a 42% higher risk of heart disease and a 19% higher risk of type 2 diabetes. In contrast, the researchers did not find any higher risk of heart disease or diabetes among individuals eating unprocessed red meat, such as from beef, pork, or lamb.
The processed meats contain four times the sodium and 50% more nitrates than their ( naturally occurring ) unprocessed counterparts. "This suggests that added salt and preservatives - rather than naturally occurring fats - may account for the risks."
Harvard School of Public Health : Heart Disease and Processed Meats
Back away from that bologna sandwich and nobody gets hurt! :-)