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.

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 an adult with mild obesity, swapping out saturated fats (like butter) for healthier fats from walnuts or vegetable oils for six weeks might lower your blood pressure by about 5 or 6 points — and how your body processes food could affect how much it drops.

Replacing butter with oils like those in walnuts helps lower cholesterol because of the type of fat, not something special in the whole nut.

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 for two months might help lower bad cholesterol and a blood protein linked to heart disease in healthy older white adults.