Question 28 of 433
What is ApoB, and why do longevity doctors talk about it so much?
The short answer
ApoB counts the number of harmful cholesterol particles in your blood. It is often a better predictor of risk than the standard LDL number.
Think of your bloodstream as a highway. LDL cholesterol measures the cargo. ApoB counts the trucks. It is the trucks that crash into the artery wall. Most of the time cargo and trucks rise together. But in people with diabetes, prediabetes, belly fat, or high triglycerides, there can be many small trucks carrying little cargo each. Their LDL looks fine and their ApoB is high.
The 2026 American cholesterol guideline recommends measuring ApoB in people like these, especially those with diabetes, high triglycerides, or metabolic syndrome. It is an inexpensive blood test. Ask for it.
“This book is for education. It is not medical advice, and reading it does not make you my patient or create a doctor-patient relationship.” From the book’s medical disclaimer. Full disclaimer
ROBUST RISK EVIDENCE / GUIDELINE — Selected adults: ApoB refines atherogenic-particle assessment; a measurement alone is not treatment.Evidence grade (draft mapping)CObservationalPart 3, Q28 · Sources: R4
Sources cited
- R4 Blumenthal RS et al. 2026 ACC/AHA multisociety Guideline on the Management of Dyslipidemia. Journal of the American College of Cardiology. 2026. doi:10.1016/j.jacc.2025.11.016. Link pending verification
From Longevity Unmasked by Afshine Ash Emrani, MD, FACC. Medical disclaimer. This book is for education. It is not medical advice, and reading it does not make you my patient or create a doctor-patient relationship. Nothing here is meant to diagnose, treat, cure, or prevent any disease. Medicine is personal: a test, drug, supplement, or exercise plan that helps one person can harm another. Do not start, stop, or change any medication or treatment because of something you read in these pages. Talk with a licensed clinician who knows your history first. If you think you are having a medical emergency, call 911. The author disclaims responsibility for any loss or harm arising from use of the information in this book.