LDL cholesterol is a well-established risk factor for cardiovascular disease, which in turn affects lifespan. However, the relationship between LDL and longevity is nuanced: very low LDL levels may be linked to increased risk of hemorrhagic stroke or cognitive decline. Genetic variants in genes like APOB, LDLR, or PCSK9 influence LDL levels and cardiovascular risk. The FOXO3 longevity SNP (rs2802292) has only a modest effect; lifestyle factors such as diet, exercise, and fasting have a greater impact. DNA tests claiming to predict 'longevity' are often overhyped – no consumer test can reliably forecast lifespan. A prudent approach is to keep LDL in a moderate range (around 100–130 mg/dL for healthy individuals), monitor inflammatory markers and triglycerides, and consider individual risk factors (family history, hypertension). The evidence for LDL as a risk factor is strong, but for longevity as a whole it is moderate, as many factors interplay.
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