Eating a small handful of walnuts every day for a month doesn’t seem to make arteries more flexible in healthy young guys, according to this claim.

Eating a small handful of walnuts every day might not be enough to help your heart—you might need to eat a lot more to see any benefit, at least if you're a healthy young guy.

If you're at risk for heart disease, swapping some unhealthy fats in your diet for a handful of walnuts every day for six weeks might lower a key type of blood pressure by a small but meaningful amount — and the nuts themselves may do more good than just their fats alone.

If you're at risk for heart disease, swapping some fatty foods for whole walnuts every day for six weeks might lower an important type of blood pressure by a small but meaningful amount — even if your top blood pressure number doesn't change.

Eating a small handful of walnuts every day for two months might help lower bad cholesterol and a blood protein linked to heart disease in healthy older white adults.

Eating walnuts might help your blood vessels work better, which could lower your risk of heart disease down the line.