[Behavior of electrolytes in the metabolism of hunger]

In 20 patients, undergoing a fasting period of 14 days, electrolyt balances were studied. Ten patients received 80 mval potassium per day. Sodium, potassium, calcium and phosphate in blood did not change; bicarbonate and chloride levels diminished. Balance studies showed a significant loss of potassium in both groups. Product of sodium and potassium was constant; calcium balance was positive, whereas that of phosphate was negative. During addition of 80 mval potassium per day significant change of sodium balance occurred.