Have you accidentally drop your food on the floor or ground? A couple of second after the food fell, you pick it up then you put it in your mouth and still feeling there is no harm in eating it.. Its called the 5 second rule. Once you drop it, if you dont want to waste it, its not a problem to pick it up then eat it. Just dont forget the 5 second rule... Below a simple illustration to demonstrate how it works.... Note: if there is a problem, find a doctor. not me. please and thank you :p. Rules were not meant to follow blindly.