Apolipoprotein B (ApoB)
FoundationalTrack in Cellar· every few years
What it measures
A protein found on each cholesterol-carrying particle that can deposit in artery walls, so it effectively counts those particles.
Why it's discussed for longevity
Often discussed in cardiovascular prevention because it counts atherogenic particles directly; some clinicians prefer it to standard cholesterol for tracking.
Source: MedlinePlus (NIH)