💊 Medication
statins
Cholesterol-lowering drugs. Strong evidence they lower LDL and cut cardiovascular events (clearest in secondary prevention; smaller but real in primary prevention), and they modestly raise type-2-diabetes risk. Two popular fears don't hold up in blinded trials: muscle symptoms are mostly a nocebo effect, and cognitive impairment is not supported.
6 well-supported · 3 disputed. This shows how settled each sub-question is, not whether statins is "good." Direction lives in each claim below.
The 9 claims about statins
Each keeps its own verdict — we never average them away.
Do statins lower LDL cholesterol?
Strong support Unambiguously yes — this is a direct, dose-dependent pharmacologic effect quantified across thousands of patients.
Do statins reduce major cardiovascular events in patients with established cardiovascular disease?
Strong support Yes — among the best-supported claims in cardiology: large RCTs and CTT meta-analyses show a consistent ~20-25% relative risk reduction in major vascular events per ~1 mmol/L LDL lowering.
Do statins prevent cardiovascular events in people without established cardiovascular disease?
Strong support Yes, but with smaller absolute benefit: RCTs and meta-analyses show a real ~25-30% relative reduction in first events, though absolute risk reduction is modest in lower-risk populations.
Do statins increase the risk of developing type 2 diabetes?
Strong support Yes, a real but modest effect: meta-analyses show roughly a 9-12% relative increase in new-onset diabetes, dose-dependent, and far outweighed by cardiovascular benefit in indicated patients.
Do statins lower the appetite-and-blood-sugar hormone GLP-1?
Strong support Yes — statins appear to lower this hormone via a gut-bile pathway, though the human evidence rests on one small study.
Does how much a statin lowers LDL predict how much it cuts heart-attack risk across trials?
Leans support At the TRIAL level the size of LDL-lowering is a weak surrogate for benefit (R-squared near 0), yet per-mmol meta-analyses and Mendelian randomization still show LDL is causal — so this is a surrogacy gap, not proof LDL is harmless.
Do statins damage muscle energy machinery (mitochondria/CoQ10) and cause the muscle aches people report?
Leans against Statins measurably lower muscle mitochondrial respiration, but CoQ10 depletion is inconsistent and blinded trials show most reported muscle aches are not actually caused by the drug.
Do statins only help if a coronary calcium or CT scan already shows plaque?
Refuted Contradicted: while imaging cohorts show statin benefit concentrates where coronary calcium is present, primary-prevention RCTs (e.g. JUPITER) and the CTT individual-data meta-analysis show statins cut cardiovascular events even in unscanned, lower-risk people, and the proportional benefit is independent of baseline risk — so gating benefit on pre-existing/imaged coronary disease is not supported.
Do statins cause cognitive impairment?
Refuted The directional claim is not supported: blinded RCTs and meta-analyses are largely null/reassuring, finding no consistent adverse effect on cognition.
Educational only, not medical advice. Hub descriptions are curated for honesty; see the methodology.