An eating disorder resulting from a desire for improper food which results in a higher than normal concentrations of potassium (K+) ions in the circulating blood: Because hyperkalemia can cause lethal cardiac arrhythmia, it is one of the most serious electrolyte disturbances.

The reference to "electrolyte" involves various ions, such as sodium, potassium, or chloride, which are required by cells in the body to regulate the electric charges and flows of water molecules across the cell membranes.