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New research from Britain finds that time really does matter with food that's fallen to the floor.  The study was done on biology students in England, where researchers monitored the transfer of common bacteria like E coli.

It's safer to eat food from the floor if it fell on carpet as opposed to tiled or laminate surfaces.  This is especially true when food was moist and left on the floor for more than five seconds.

Of the 87 percent of men and women who admit to picking up food off the floor and eating it...55 percent of those were women.  Even babies eat food off the floor.