Evidence check: APOE in the context of Langlebigkeit

The APOE gene variant (especially ε4) is one of the most well-established genetic risk factors for reduced longevity, primarily due to its strong association with Alzheimer's disease and cardiovascular risk. Carriers of one ε4 allele have a 3- to 12-fold increased risk for Alzheimer's, and life expectancy can be shortened by several years. However, APOE is not deterministic: many ε4 carriers live into old age, especially with a healthy lifestyle. Evidence is strong from large meta-analyses and GWAS (e.g., PMID: 29038693, PMID: 30894756). A consumer DNA test like MyBody-X can report APOE status, but it provides a risk estimate, not a clinical diagnosis. The ε2 allele is associated with slightly increased longevity. Caveat: effect sizes vary by ancestry (e.g., weaker in African populations). Overall, APOE testing can be informative but should be interpreted with caution and in context of other risk factors.