A lot of people with heart problems don't actually have high LDL cholesterol — about half of them have normal or even low levels — so maybe LDL isn't the main cause of heart disease after all.
Evidence from Studies
Supporting (1)
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The study finds that low LDL doesn’t always mean low heart disease risk, and lowering LDL doesn’t always prevent heart problems, which supports the idea that LDL may not be the main cause of heart disease.
Contradicting (2)
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The study shows that in people who already have heart artery plaque, higher LDL cholesterol leads to more heart problems, which goes against the idea that LDL doesn’t matter for heart disease.
The LDL cumulative exposure hypothesis: evidence and practical applications
Just because some heart patients have normal cholesterol doesn’t mean cholesterol isn’t the cause—this study shows that long-term exposure to even moderate levels can lead to heart disease over time.
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.