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Important Fly Facts!

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Face Flies (Musca autumnalis) cause extreme annoyance to cattle on pasture all summer. They feed on animal secretions such as tears, saliva, nasal mucus, and blood oozing from wounds. They also sometimes serve as vectors of eye diseases and parasites such as pinkeye and eye worms.
Source: U. S. Department Of Agriculture 

More Facts Houseflies can only take in liquid foods. The instant the fly lands on your food it secretes an enzyme called volidrop, along with a portion of his previous meal. This it does right on the area of the food it wants to consume. This potent mixture liquefies the tiny spot almost immediately.

The fly then consumes the liquid food and moves on leaving behind diseases that can get you deathly sick. After they eat they spit it out then suck it back in. They also throw up partially digested matter and eat it again. The flies can walk on vertical planes, and can even hang upside down from ceilings. This is accomplished with the surface tension (a phenomenon at the surface of a liquid caused by intermolecular forces) of liquids secreted by various organs that synthesize substances needed by the body and release it through ducts or directly into the bloodstream via glands near their feet. Lacking eyelids, the flies continually clean their eyes with their forelegs. Most of their taste and smell sensor cells are on hairs on their legs, and that is why they also keep rubbing their legs together.

Source: U. S. Department Of Agriculture  MORE fly facts from the University of Nebraska