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APOE4 & Cognitive Decline
The APOE gene provides instructions for making a protein called apolipoprotein E, which combines with fats in the body to form lipoproteins. The APOE4 variant is the strongest known genetic risk factor for late-onset Alzheimer's disease.
Genotype Risk Multipliers
| Genotype | Population Frequency | Alzheimer's Risk Multiplier |
|---|---|---|
| e3/e3 (Baseline) | ~60% | 1x |
| e3/e4 (Heterozygous) | ~20% | 2-3x |
| e4/e4 (Homozygous) | ~2-3% | 8-12x |
Common Mistakes
- Fatalism: APOE4 is a risk factor, not a diagnosis. Lifestyle factors (sleep, insulin resistance, DHA intake) heavily modulate the expression of this risk.
Frequently Asked Questions
Q: Should I change my diet if I have APOE4?
A: Emerging research suggests APOE4 carriers may have impaired brain glucose metabolism but can effectively utilize ketones. Maintaining high insulin sensitivity is critical.