What will cause the body to waste potassium?

Loss of potassium: Your kidney's help maintain normal levels of potassium(k+) under the influence of a hormone of several hormones including aldosterone. If aldosterone is too high, your k+ will be excessively excreted. There are other causes of k+ wasting as well. Diuretics for example are notorious for causing low k+, low magnesium, other drugs, a kidney disease - renal tubular acidoisis, vomiting, diarrhea, .....

Lots of things: There are numerous medications that affect potassium balance as well as modify potassium removal from the body. One of the most common conditions in the U.S. Is a high sodium diet requiring the use of diuretics to avoid fluid overload giving the side effect low potassium. There are rare hormone causes of kidney potassium losses. Also vomiting or diarrhea can cause low potassium. Good luck.