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Best Answer: Different flies dine on different foods. Flies around the world eat nectar, plant sap, blood, other insects, and decaying matter. Did you know that a mosquito is actually a type of fly? Of the species of flies that eat blood, only the females are the blood eaters.
Since the housefly's mouth parts are designed to sponge and ingest liquefied food, it's just a matter of turning on the suction. The food goes straight into the fly's stomach. Oxford Scientific/Photolibrary/Getty Images. A housefly uses its proboscis to eat a piece of sugar. Solid food is slightly more difficult. Houseflies can't bite or chew -- they simply don't have the proper equipment. So if forced to contend with something more solid, like a grain of sugar or dried blood, houseflies must employ a different tactic. First, the housefly scrubs the dry food substance with the bristles on the end of its proboscis.