Kidney's are influenced by the element "wind". One of the characteristics of "wind" is movement.Another is cold. Keep your kidney's warm and minimize wind agravation. "Salt" is a potential wind agravator. Potassium Iodide is a "salt". Iodine is a "salt". Sodium Chloride is a "salt". "Salt" is also a taste. The elements (earth water fire wind and space) must be in sync (relative to the individual) in order to maintain _health.