What Is ApoB?
Apolipoprotein B (ApoB) is a protein found on the surface of every atherogenic lipoprotein particle — LDL, VLDL, IDL, and Lp(a). Unlike standard LDL cholesterol, which measures the amount of cholesterol inside LDL particles, ApoB counts the actual number of particles circulating in your blood.
This distinction matters because cardiovascular risk is driven by particle count, not cholesterol content. Two people with identical LDL-C levels can have very different ApoB levels — and very different risk profiles.
Why ApoB Is Better Than LDL-C
Standard lipid panels report LDL cholesterol (LDL-C), which estimates the mass of cholesterol carried by LDL particles. But LDL particles vary in size. Someone with many small, dense LDL particles may have a "normal" LDL-C but an elevated ApoB — and significantly higher risk.
Major cardiology societies including the European Atherosclerosis Society now recommend ApoB as the primary target for lipid-lowering therapy, ahead of LDL-C.
ApoB is the single best blood test predictor of heart attack and stroke risk. If you're only tracking LDL-C, you're missing the full picture.
Optimal Ranges
- Standard reference: < 90 mg/dL
- Optimal (longevity-focused): < 80 mg/dL
- Low-risk target: < 60 mg/dL (per preventive cardiologists like Peter Attia)
Most lab panels don't include ApoB by default. Function Health includes it in every panel, making it easy to track in GATOR alongside your other biomarkers.
What Elevates ApoB?
- High saturated fat intake
- Insulin resistance and metabolic syndrome
- Familial hypercholesterolemia (genetic)
- Hypothyroidism
- Chronic inflammation
How to Lower It
- Reduce refined carbohydrates — insulin resistance increases VLDL production
- Replace saturated fat with monounsaturated fat — olive oil, avocados, nuts
- Exercise regularly — both aerobic and resistance training improve particle clearance
- Consider pharmacotherapy — statins reduce ApoB by 30-50%; PCSK9 inhibitors by 50-60%
Track ApoB in GATOR
GATOR normalizes ApoB from Function Health, LabCorp, and InsideTracker into a single longitudinal view. See your ApoB trends, calculate the ApoB/ApoA1 ratio (one of GATOR's 17 clinical ratios), and get AI-powered insights on what your trajectory means.