Diet, DASH: An eating plan designed to lower the blood pressure. DASH is an acronym for Dietary Approaches to Stop Hypertension. The DASH 'combination diet' has been shown to decrease the blood pressure, and so helps to prevent and control high blood pressure. The DASH 'combination diet' is rich in fruits, vegetables, and low fat dairy foods. It is low in saturated and total fat and cholesterol, while high in dietary fiber, potassium, calcium, and magnesium, and somewhat high in protein.