a narrow opening produced by cleavage or separation of parts. 2. cleavage (def 1). 3. Anatomy. a natural division or groove in an organ, as in the brain. verb (used with object), fissured, fissuring. 4. to make fissures in; cleave; split.
A diet rich in potassium helps to counterbalance some of sodium's harmful effects on blood pressure. Foods that are good sources of potassium are listed in the Food Sources of Potassium table on the next page.
DASH stands for Dietary Approaches to Stop Hypertension. In research studies, people who were on the DASH diet lowered their blood pressure within 2 weeks. Another diet -- DASH-Sodium -- calls for cutting back sodium to 1,500 milligrams a day (about 2/3 teaspoon).