It's good to air the rooms once in a while :)
Brandon has a point. Clean the whole room, after shaving off your hair, making sure there is no hair pieces left. Actually, another thing you should do is dye your hair with blue color, so you can identify your own hair. Also, neglect hair pieces less than 1 inch long.
Okay, so lets say we actually made this into a controlled experiment. What would happen is the food would be checked for hairs, found to have none, then left in a vacuum container (no air, nothing, just empty space) and sits there for a long period of time. After this time, we take the food out and examine it for dyed hairs, hell, even check the DNA of the hair to find a match to it.
Now what's wrong with this? We've (physicists) done this type of experiment with countless other hypothesis and not once have they ever had a hair (or any other macroscopic object) just suddenly and randomly appear inside the vacuum. Never. Now, I don't know if you guys appreciate evidence as much as me, but saying we've done experiments with vacuum containers since the 20's or earlier and not once have we found some random macroscopic object find its way in and have no plausible answer but that it was "teleported" there, says a lot more than just wild guess work that Aristotle might appreciate.