Even if you feel fine, your arteries might start building up plaque when your 'bad' cholesterol (LDL) hits around 50 to 60 mg/dL, and the more LDL you have, the more plaque builds up — steadily and predictably.
Evidence from Studies
Supporting (3)
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Normal LDL-Cholesterol Levels Are Associated With Subclinical Atherosclerosis in the Absence of Risk Factors.
The study found that even people with normal cholesterol levels can have early signs of artery plaque, and higher LDL cholesterol increases that risk — which supports the idea that plaque can start building up even when cholesterol isn't high.
Normal LDL-Cholesterol Levels Are Associated With Subclinical Atherosclerosis in the Absence of Risk Factors.
The study found that even people with normal cholesterol levels and no other heart risks often have early signs of artery plaque, and higher LDL cholesterol—even within the normal range—was linked to more plaque.
Non-HDL and LDL cholesterol, but not calculated remnant cholesterol, are associated with subclinical atherosclerosis.
The study shows that higher 'bad' cholesterol (LDL) is linked to early signs of artery damage, even in healthy people, which supports the idea that plaque can start building up at relatively low cholesterol levels.
Contradicting (1)
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Prevalence of carotid atherosclerosis in 3-92-year-old Finns. The 3-generational cardiovascular risk in young Finns study.
The study found that high cholesterol is linked to artery plaques, but it looked at much higher cholesterol levels than the claim talks about, so it doesn’t prove plaques start at very low levels.
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.