Each additional 25 grams of processed meat consumed daily — roughly the weight of two slices of deli turkey — corresponded with a 44% to 52% increase in the risk of all-cause dementia and Alzheimer’s disease, according to a scientific review published in Annual Review of Nutrition. The review, authored by 26 researchers from institutions worldwide, synthesizes decades of research on ultra-processed foods and brain aging.
The underlying human data came largely from a UK study of nearly 500,000 people, according to the review. Lead author Owen T. Carmichael is based at the Pennington Biomedical Research Center in Baton Rouge, Louisiana. The authors state plainly that all human evidence on the topic is observational, meaning it can show associations but cannot prove that processed meat causes dementia.
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