Potassium

Low potassium is associated with a risk of high blood pressure, heart disease, stroke, arthritis, cancer, digestive disorders, and infertility. 

Potassium deficiencies are ideal for people who use certain medicines, such as diuretics, have physically demanding jobs, athletes exercising in hot climates and sweating excessively, have an eating disorder, have health conditions that affect their digestive absorption, such as Crohn's disease, or smoke.