Cheese Consumption Linked to Lower Dementia Risk

A 25-year prospective analysis from the Malmö Diet and Cancer cohort evaluated the associations between high-fat and low-fat dairy intake and incident dementia in 27,670 Swedish adults. Dietary assessment combined a 7-day food diary, a 168-item food frequency questionnaire, and structured interviews, with follow-up through national registry linkage. Over a median of 25 years, 3,208 cases of all-cause dementia were identified, including validated subtypes through 2014.

In fully adjusted Cox proportional hazards models controlling for demographic, lifestyle, cardiometabolic, and dietary quality factors, high-fat cheese intake, defined as greater than 20 percent fat, demonstrated an inverse association with all-cause dementia. Participants consuming at least 50 g/day had a hazard ratio of 0.87 compared with those consuming less than 15 g/day. High-fat cream intake above 20 g/day was associated with a hazard ratio of 0.84 for all-cause dementia in extended follow-up analyses. Dose-response modeling suggested approximately linear inverse relationships for high-fat cheese and cream.

Low-fat cheese, low-fat cream, high-fat and low-fat milk, fermented milk, and butter were not associated with reduced dementia risk. Notably, high butter intake was associated with increased Alzheimer disease risk in subtype analyses. High-fat cheese intake was inversely associated with vascular dementia and, among APOE e4 noncarriers, with Alzheimer disease, with a significant interaction by genotype for AD.

Substitution analyses indicated increased dementia risk when high-fat cheese or cream was replaced with milk, fermented milk, processed meat, or high-fat red meat, suggesting that food source and matrix may be more relevant than absolute fat quantity. Sensitivity analyses excluding early incident cases strengthened the inverse associations, reducing concerns regarding reverse causation. However, restriction to participants reporting stable dietary patterns attenuated some associations.

Mechanistically, potential explanations include the dairy food matrix effect, differences in fermentation-derived metabolites, and the presence of fat-soluble bioactives such as vitamin K2 in aged cheeses. Randomized trials have shown neutral or favorable lipid responses to regular-fat cheese compared with reduced-fat cheese, and Mendelian randomization studies link cheese consumption to lower diabetes and hypertension risk, both established dementia risk factors.

In summary, this large prospective cohort suggests that higher intake of high-fat cheese and cream, but not low-fat dairy, is associated with reduced long-term risk of all-cause dementia, with genotype-specific associations for Alzheimer disease. These findings challenge conventional dietary guidance that categorically discourages full-fat dairy and underscore the importance of considering food matrices and specific food sources in neurodegenerative risk assessment.