Remnant cholesterol

Remnant cholesterol is the cholesterol packed inside triglyceride-rich lipoprotein remnants. When you are fasting, those are mainly VLDL and IDL; after meals, chylomicron remnants. You can calculate it simply: total cholesterol minus LDL-C minus HDL-C. (Direct measurement gives somewhat higher numbers.) Here is why it matters. Remnant particles under about 70 nm can cross your artery lining by active transport. They build up in the wall and trigger foam-cell formation and endothelial damage. And each particle carries up to four times the cholesterol of an LDL particle. Genetics nails the cause. In the Copenhagen General Population Study (Varbo et al., 2013; 73,513 people), Mendelian randomization estimated a causal odds ratio of 2.8 (95% CI 1.9 to 4.2) for heart disease. That was per 1 mmol/L higher non-fasting remnant cholesterol, independent of HDL. Variants in TRIB1, GCKR, and APOA5 reinforce that. They help explain the residual heart risk in statin-treated patients whose LDL is well controlled. The optimal fasting level is generally placed below 0.5 mmol/L (about 19 mg/dL). Levels at or above 1.5 mmol/L (about 58 mg/dL) carry roughly a 1.9- to 2.3-fold higher heart-attack hazard in Copenhagen data. Remnant metabolism worsens with insulin resistance and belly fat, which track with faster aging. So high remnant cholesterol may partly explain the excess heart deaths in metabolic-aging phenotypes.

Last reviewed: June 22, 2026

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