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.
This increases the volume of your blood and the pressure in your blood vessels. Most healthy people should limit their sodium intake to 2,300 milligrams (mg) or less per day. If you have high blood pressure, diabetes, or chronic kidney disease, you should eat no more than 1,500 mg of sodium per day. You should also limit your sodium intake to 1,500 mg daily if youâre African-American or over 50 years old.