Abstract
House flies maintained on lactose, wheat flour, milk powder, or 1-arabinose die within 48 hours, as they do if deprived of all food. A utilizable energy source such as sucrose takes precedence over water in fly survival. On sucrose alone, flies live about 50 percent longer than on water alone. Under conditions ranging from partial to complete inanition or dehydration, females prove more hardy and live more than 35% longer than males. Powdered food produces an avoidance reaction in the fly which is counterbalanced by its hunger drive. The fly's position at the edge of the food is a resultant of these two forces.
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