The experiment described in this report was undertaken to explore practicable measures that might minimize dehydration and other metabolic derangements in a fasting, arctic survival situation. Twenty- eight men, divided into four groups, were fed a standard diet of USAF IF#10 rations in barracks for two days, then subjected to a three-day simulated survival situation, followed by two days of standard diet in barracks. Group A received no supplements, Group B received an electrolyte supplement administered as 150 mEq NaCl the first day and 150 mEq NaHCO3 the next two days, Group C 500 kcal as sucrose, and Group D 500 kcal as sucrose plus electrolyte as in B. Results suggest that a survival ration could, with benefit, comprise 500 kcal/day of carbohydrate supplemented with a sodium salt, as this combination ameliorates dehydration, hypoglycemia and ketonuria ordinarily associated with a survival situation. Provision of sodium as bicarbonate did not appear to be of any advantage.