If you've already had heart problems, keeping your 'bad' cholesterol really low—below 55—might help prevent future heart attacks or strokes compared to aiming for a higher level.
Evidence from Studies
Supporting (3)
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Intensive LDL Cholesterol Targeting in Atherosclerotic Cardiovascular Disease
The study found that aiming for LDL cholesterol below 55 mg/dL led to fewer heart problems over 3 years compared to aiming for below 70 mg/dL in people who already had heart disease.
Effect of More Intensive LDL-C-Lowering Therapy on Long-term Cardiovascular Outcomes in Early-Phase Acute Coronary Syndrome: A Systematic Review and Meta-analysis.
The study looked at whether stronger cholesterol treatment after a heart event helps prevent future problems. It found that lowering cholesterol more dramatically—especially in high-risk patients—leads to fewer heart attacks and strokes, which supports the idea that very low cholesterol targets are beneficial.
Statins and the cholesterol mortality paradox
The study shows that lowering cholesterol very aggressively helps prevent heart attacks and strokes in people with heart disease, even if it doesn’t help them live longer overall.
Contradicting (1)
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The study looked at patients who already had very low LDL cholesterol when they had a heart attack, and found they still had high risks of bad outcomes, suggesting that just having low LDL isn’t enough to prevent heart problems.
Gold Standard Evidence Needed
According to GRADE and EBM methodology, here is what ideal scientific evidence would look like to definitively prove or disprove this specific claim, ordered from strongest to weakest evidence.