What role does LDL play in longevity?

LDL cholesterol is often simplistically labeled as 'bad,' but its role in longevity is nuanced. On one hand, elevated LDL is a well-established risk factor for atherosclerosis and cardiovascular disease, which can shorten lifespan. On the other hand, LDL is essential for transporting fat-soluble vitamins and hormone precursors. Extremely low LDL levels (below 50 mg/dL) have been associated in research with increased risks of hemorrhagic stroke, mood disturbances, and possibly infections. The overall evidence is strong (large epidemiological studies, randomized statin trials), but individual significance depends on factors like LDL particle size, oxidative stress, inflammation status, and genetic predisposition (e.g., PCSK9 variants). For longevity, a moderate LDL level (around 100–130 mg/dL) combined with good cardiovascular health is likely optimal. Focusing solely on LDL ignores the complex lipid profile and lifestyle. Caveat: Not medical advice; individual risk assessment by a professional is necessary.