Diet plays an essential role in lowering blood pressure and a growing body of evidence recommends certain foods for their blood pressure-lowering properties.

One study, published in the Journal of the American Heart Association, makes a strong case for supplementing a diet low in saturated fats with walnuts to help lower blood pressure.

In a randomised, controlled trial, researchers examined the effects of replacing some of the saturated fats in participants' diets with walnuts.

Saturated fat is the kind of fat found in butter, lard, ghee, fatty meats and cheese. Eating a diet high in saturated fat is associated with raised levels of non-HDL (bad) cholesterol, a waxy substance found in your blood that is tied to cardiovascular complications, explains the British Heart Foundation.

They found that when participants ate whole walnuts daily in combination with lower overall amounts of saturated fat, they had lower central blood pressure.

READ MORE:High blood pressure: The surprising food that could lower your reading

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High blood pressure: Include this snack in your diet to lower your reading - Express