Eating walnuts might help lower body-wide inflammation and make your blood vessels work better by relaxing more easily.
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 walnuts may help reduce inflammation, which supports part of the claim, but it didn’t measure the exact signs of blood vessel health mentioned.
Contradicting (2)
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Benefits of Short-Term (4-Week) Daily Walnut Consumption in Middle-Aged Adults at Risk for Metabolic Syndrome: Outcomes of a Randomized Controlled Trial
The study looked at whether eating walnuts helps with inflammation and blood vessel health, but it didn’t find evidence that walnuts lowered the inflammation marker or improved blood vessel function like the claim says.
Effect of walnut consumption on markers of endothelial function in adults: A systematic review and meta‐analysis of randomized controlled trials
The study shows walnuts may help blood vessels work better, but it doesn’t find proof they reduce a key marker of inflammation called VCAM-1.
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.