Should you eat food that's been dropped on the floor even if it only touched the ground for less than 5 seconds. Our medical expert Dr. Jennifer McKay with Avera McKennan says no you shouldn't. All different types of flooring can contain a number of bacteria that can transfer to food in as little as 5 seconds. Not everyone will get sick, but that doesn't mean you won't after eating food that's fallen onto unsanitary surfaces.