Swapping out bad fats like butter or fried food fats with healthy fats from walnuts can help your liver make less cholesterol and clear more 'bad' cholesterol from your blood.
Evidence from Studies
Supporting (1)
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Effects of walnut consumption on blood lipids and other cardiovascular risk factors: a meta-analysis and systematic review.
The study shows that eating walnuts lowers bad cholesterol, which fits with the idea that walnuts are heart-healthy, but it doesn’t prove exactly how they do it in the body.
Contradicting (2)
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The study found that eating walnuts instead of saturated fats lowered bad cholesterol, but it didn’t look at how the body makes or removes cholesterol, which is what the claim is about.
Replacing Saturated Fats with Unsaturated Fats from Walnuts or Vegetable Oils Lowers Atherogenic Lipoprotein Classes Without Increasing Lipoprotein(a)
The study shows that eating walnuts instead of saturated fats lowers bad cholesterol, but it didn’t test how or why that happens, so we can’t say if it’s due to the specific processes mentioned in the claim.
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.