Does red and processed meat really increase your risk of colorectal cancer?
Multiple large studies consistently show that high consumption of red meat, and especially processed meat, raises the risk of colorectal cancer. The evidence is strong enough to warrant consciously limiting your intake of processed meat (sausage, bacon, deli meats).
Red meat and processed meat both consistently raise the risk of colorectal cancer. For red meat, the increase is roughly 10 to 22 percent for high intake compared with low intake. For processed meat, such as sausage, bacon and deli meats, the figure is somewhat higher: approximately 18 to 21 percent greater risk. For every additional 50 grams of processed meat per day, the risk rises by around 18 percent.
This is a statistical association, not a proven causal relationship. That may sound like a caveat, but the association has been found across multiple large studies involving hundreds of thousands of participants who were followed for many years. For colorectal cancer, red and processed meat is one of the best-documented diet-related risk factors we know of.
The relationship appears to be dose-dependent. For every additional 100 grams of red meat per day, the risk rises by approximately 14 to 17 percent. That effect continues up to about 140 grams per day, after which it levels off. These are averages across large groups: whether your individual risk rises also depends on other factors such as age, heredity and being overweight.
The elevated risk applies specifically to colon cancer and also to rectal cancer, although the results for rectal cancer are slightly less consistent. There are also indications that high consumption is associated with a greater risk of other cancer types, such as breast and uterine cancer, but the evidence for those is less strong than it is for colorectal cancer.
Practically speaking: people who regularly eat large amounts of processed meat or red meat have a measurably higher statistical risk of colorectal cancer than those who eat little of it. You do not need to avoid it entirely, but reducing the amount, especially of processed meat, is a concrete step with the strongest supporting evidence.
Based on multiple large meta-analyses of prospective cohort studies (PMID 34455534, 40210826, 21674008, 33838606, 25575572) and clinical review articles (PMID 35361331, 35000418, 33518157). This is observational evidence; causality has not been directly proven.
Does eating processed meat such as sausage and ham give me colorectal cancer?
Eating a lot of processed meat measurably raises your risk of colorectal cancer by around 18-21%. Eating less sausage and ham, combined with more fibre, is the most evidence-backed step you can take yourself.
Is red and processed meat really bad for me?
Yes, and this applies above all to processed meat: the association with colorectal cancer and cardiovascular disease is solid enough that eating less of it is a practical step for your health.
Does eating less red meat lower your risk of cancer?
Eating less red and processed meat probably lowers your risk of colorectal cancer, and possibly of several other cancer types as well. This concerns risk reduction, not complete protection.
Does eating heavily heated or charred food increase your risk of cancer?
Heavily heated or charred meat likely increases the risk of certain types of cancer, although the associations in humans are associative. By not charring meat and varying cooking methods, you can substantially reduce your exposure to these substances.
Does eating from plastic packaging increase your risk of cancer?
There is clear evidence that substances that leach from plastic, such as BPA and PCBs, are associated with cancer; for micro- and nanoplastics that evidence in humans is still lacking. Limit your exposure where you can, especially when heating food in plastic containers.
Does eating a high-fibre diet help protect against colorectal cancer?
Eating more fibre is consistently associated with a lower risk of colorectal cancer, with whole grains having the strongest supporting evidence. Try to eat wholegrain bread, oats or legumes every day as a concrete step.