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.
Reducing Sodium in Childrenâs Diets. Nearly 9 in 10 US children eat more sodium than recommended, and about 1 in 9 children has raised blood pressure, which is a major risk factor for heart disease and stroke. Lowering sodium in childrenâs diets today can help prevent heart disease tomorrow.