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.
Therefore, about 60 percent of the population should get no more than 1,500 milligrams of sodium per day to prevent cardiovascular disease. This includes diabetics, patients with kidney disease, African Americans and all adults over the age of 51.