Apolipoprotein E (APOE) Genotype Effects on Triglycerides and Blood Flow in the Human Brain

This research study explores how a gene variant called APOE E4 — a known risk factor for Alzheimer's disease — affects blood fat (triglyceride) levels and blood flow in the brain. Researchers hope this will help understand why APOE E4 raises dementia risk. **You may be eligible if...** - You are 55 years old or older - You are able to undergo an MRI scan - You are able to consume dairy products - You can read, understand, and communicate in English - You are post-menopausal (if a woman) **You may NOT be eligible if...** - You have diabetes requiring medication (insulin or oral medication) - You take medication for high blood pressure - You have certain heart conditions or take specific medications that could interfere with results - You have claustrophobia or a metal implant preventing MRI Talk to your doctor to see if this trial is right for you.