Not eating enough potassium is an obvious cause of nutritional potassium deficiency. However, severe low potassium symptoms do not usually develop from dietary habit alone. Your kidneys have the ability to compensate for varying amounts of potassium intake. If your diet contains foods high in potassium and your body is getting too much potassium, your kidneys excrete the extra potassium in your urine. If your diet does not contain foods high in potassium and your body is getting less potassium, your kidneys conserve potassium by decreasing the concentration of potassium in your urine.