Processed meat — bacon, ham, sausages, hot dogs, and deli slices — has been formally classified as carcinogenic to humans by the World Health Organization’s cancer research arm, based on evidence linking regular consumption to colorectal cancer. Large long-term studies also connect daily intake to significantly higher risks of cardiovascular disease, type 2 diabetes, and, more recently, dementia. The science does not call for elimination, but it does make a clear case for treating these foods as occasional rather than everyday staples.
In brief
- —WHO cancer agency classifies processed meat as carcinogenic to humans
- —Each daily serving linked to 46% higher type 2 diabetes risk
- —Two servings per week associated with 14% higher dementia risk
IARC formally classifies processed meat as a cause of colorectal cancer
The International Agency for Research on Cancer, part of the World Health Organization, reviewed population studies and placed processed meat in its Group 1 category — carcinogenic to humans. The WHO states directly: "In the case of processed meat, this classification is based on sufficient evidence from epidemiological studies that eating processed meat causes colorectal cancer."
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