The American Heart AssociationTrusted Source (AHA) note that fiber can help manage cholesterol and prevent related cardiovascular problems. A 142-g cup of unpeeled cucumber also provides 193 mg of potassium and 17 mg of magnesium. The Dietary Guidelines recommend that adults consume 4,700 mg of potassium each day and 310–410 mg of magnesium, depending on sex and age. Reducing sodium intake and increasing potassium intake may help preventTrusted Source high blood pressure.