Long-term findings
A 20-year study has linked nitrites in processed meats to a higher risk of colon cancer in men. Researchers reported the results this week after following a large group of participants for two decades. The findings add to a growing body of evidence about cured and processed foods.
Nitrites are used to preserve processed meats such as bacon, ham, sausage and deli slices. They help prevent bacterial growth and give meat its pink color. When cooked at high temperatures, nitrites can form compounds called N-nitrosamines, which have been linked to cancer in animal studies.
Men at higher risk
The study found the link in men but not in women. Researchers said the difference may come from diet patterns, portion sizes or how the body processes these compounds. Men in the study ate more processed meat on average than women did.
Participants with the highest nitrite intake showed a measurably higher rate of colon cancer than those with the lowest intake. The risk grew with the amount consumed. Even moderate eaters showed a small increase, the researchers said.
What this means for diets
Health groups have long advised limiting processed meat. The World Health Organization classifies processed meat as a probable cause of cancer. The new study gives more weight to that guidance, especially for men who eat cured meats regularly.
Experts say people do not need to cut out processed meat entirely. Instead, they recommend treating it as an occasional food rather than a daily staple. Replacing some processed meat with poultry, fish or plant proteins can reduce exposure to nitrites.
The researchers said the next step is to study whether specific preparation methods change the risk. Frying and grilling produce more N-nitrosamines than gentler cooking, so how meat is cooked may matter as much as how much is eaten. They also plan to look at whether vitamin C and other dietary factors can offset some of the harm. For now, the message to men who eat cured meats regularly is simple: moderation matters, and the evidence against daily processed meat keeps getting stronger.