People with the APOE4 allele who eat more unprocessed meat and fish show a slower decline in cognitive function over time than those who eat less of these foods.
See the scientific wording
Individuals carrying the APOE4 allele who consume diets higher in unprocessed meat and fish exhibit a slower rate of cognitive decline compared to APOE4 carriers with lower consumption of these foods.
Correlational — new studies may shift this
Observational2 good-quality studies link this claim to the outcome, but causation is not established.
What the research says
2 studies reviewedSupporting (2)
Cohort StudyHuman2022
For people with the APOE4 gene, eating more fish and unprocessed meat was linked to better memory and thinking skills over time, according to this study.
Meat Consumption and Cognitive Health by APOE Genotype
Cohort StudyHuman2026
People with a certain gene (APOE4) who ate more meat (like beef or chicken, not processed meats like bacon) had better memory and thinking over time and were less likely to get dementia, compared to those who ate less meat.
Contradicting (0)
No contradicting studies found yet
That doesn't mean it's settled — it just means no study has tested the opposite.
Quality-weighted scoring: we follow the GRADE framework — each study is rated High, Moderate, Low, or Very Low based on study design, methodology rigor, and risk of bias. A single high-quality RCT can outweigh several weaker observational studies.
Scores reflect study quality, not just count.
People with the APOE4 gene absorb more vitamin B12 from meat, which helps their brain cells convert harmful chemicals into harmless ones, protecting nerve connections and keeping memory and thinking skills stronger over time.
Score breakdown, mechanism chain, raw evidence, ideal studies needed & 2 supporting studies
How Fit Body Science checks a claim
- 1
We isolate the claim
Health advice from videos, articles and studies is broken down into single, testable claims.
- 2
We find the research
Each claim is matched against peer-reviewed studies, with every source cited by DOI.
- 3
We grade the evidence
Studies are scored on methodology, statistical rigor, transparency and publication quality.
The fitness and health internet is full of confident claims. We check them against real research.
Every claim on this site is traced back to peer-reviewed studies, scored on methodology and reporting quality, and given a verdict you can audit yourself — sources, DOIs and all.
- Full evidence breakdown and mechanism chains
- Ask our AI anything about a claim or its studies
- Get notified when new research changes a verdict