Cholesterol & ApoB, honestly — what actually matters

This is one of the best-established areas in all of medicine — and one of the most targeted by misinformation. The honest core: LDL and ApoB causally cause heart disease, and lowering them lowers risk.

The one thing to know

LDL cholesterol — better measured as ApoB, which counts the actual atherosclerosis-causing particles — is not just a marker but a cause of atherosclerotic heart disease. The evidence spans genetics, epidemiology and trials in over two million people.

Why particle number matters

Why particle number matters — an illustrative chart on this page. Figures use honest, cited or clearly-illustrative data; they are visual aids, not personal measurements.

What the evidence shows

• LDL / ApoB causally cause heart disease — Genetic (Mendelian randomisation) and trial evidence converge: lower lifelong LDL/ApoB means less atherosclerotic cardiovascular disease. This is settled science, not opinion. (established)
• ApoB is the better single number — ApoB counts every atherogenic particle (LDL, VLDL, Lp(a) remnants); it predicts risk better than LDL cholesterol alone, especially in metabolic disease. Ask for it. (established)
• Lifestyle first, then medication if needed — Fibre, plants, weight, exercise and less saturated fat lower ApoB; when that isn’t enough for your risk, statins (and others) are among the best-proven medicines we have. (established)

What’s oversold — and dangerous

• “Cholesterol is a myth / statins are poison” — This is misinformation that gets people hurt. Statins have rare, manageable side-effects and a very large, well-proven benefit for the right people. (hype)
• “Raise your HDL to be safe” — HDL tracks with health but pharmacologically raising it has not reduced events; it is a marker, not a lever to push. (emerging)

What we still don’t know

• Lp(a) A genetic, largely lifestyle-resistant particle that raises risk; targeted drugs are in trials but not yet proven to cut events.
• How low to go for whom The exact optimal ApoB/LDL target varies by individual risk, and personalising it is an active area.

Key terms

• LDL "Low-density lipoprotein" cholesterol — a causal driver of atherosclerotic heart disease.
• HDL "High-density lipoprotein" cholesterol — tracks with health but not a lever you can usefully push with drugs.
• ApoB A protein on every atherosclerosis-causing particle; the single best cholesterol marker of risk.
• Lp(a) A genetic, mostly lifestyle-resistant lipoprotein that raises cardiovascular risk; worth checking once.
• Atherosclerosis The build-up of cholesterol-laden plaque in arteries that drives heart attacks and strokes.
• Statin A well-proven class of drug that lowers LDL/ApoB and reduces cardiovascular events.