By Arun AgrahriLast reviewed
Short answer
The evidence is too thin to pick keto or Mediterranean for APOE4 carriers. The one counted source, a ketogenic-diet researcher, lands between them: a moderate, Mediterranean-like low-carb diet built on monounsaturated fats instead of heavy saturated fat. He calls extremely high fat probably not ideal for carriers.
Lifestyle changes offset the higher Alzheimer's risk that comes with APOE4.
The verdict on APOE4 overall. 3 sources: 2 positive, 1 partly
positive partly neutral negative Each researcher and each study counts once per claim, however often they come up.
APOE4 carriers do better favoring monounsaturated and polyunsaturated fats over coconut oil and MCT oil.
1 source: 1 partly. Fewer than 3 sources so far.
Researchers say
1 partly
Dr. Dominic D'Agostino, on FoundMyFitness, at 26:55
Partly Video · Opinion
Open the tape at 26:55 →“monounsaturated fatty acids as opposed to a long chain like saturated fats.”
Studies show
No study counted yet.
Dr. Dominic D'Agostino, on FoundMyFitness, at 26:55 Video · partly · Opinion
“monounsaturated fatty acids as opposed to a long chain like saturated fats.”
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People who carry the APOE4 gene variant, a genetic risk for Alzheimer's, often ask which diet to follow. One credited source counts toward this claim. Precis has not read any studies on it yet, so there is no verdict.
Dominic D'Agostino, a guest on Rhonda Patrick's show (25:22 to 29:13), takes the question directly. For carriers he would cut carbohydrates, eat plenty of fiber and keep fat moderate. He favors monounsaturated fats over long-chain saturated fats.
He calls his pick a Mediterranean-like low-carb or ketogenic diet, and says he is a professor, not a medical doctor.
The claim says carriers do better on mono- and polyunsaturated fats than on coconut oil and MCT oil. D'Agostino agrees on the fats but not on MCT. He calls medium-chain triglycerides probably helpful and lists MCT oils and omega-3s as add-ons. That is why his mention counts as only partly supporting the claim.
A second interview on Alzheimer's prevention goes further. There, carriers are told to avoid coconut oil and MCT oil and to use ketone salts or esters instead. The same passage adds that some carriers eat saturated fat and keep good lipid profiles, so they should check their own blood work.
It is not counted, because the speaker at that moment is not confirmed.
No counted source cites a trial of keto against Mediterranean in carriers. D'Agostino describes one trial of an MCT product for mild memory decline. Improvement tracked ketone levels, but that link did not show up in people with APOE4. He thinks a larger study might have found a difference.
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Full APOE4 evidence report
The verdict on every claim, and where the sources disagree