The single most important personal hygiene rule in terms of food preparation is to wash your hands. Keep germs and bacteria from getting into the food you're preparing by washing your hands before you start working, and as frequently as needed throughout the food-preparation process. Wash your hands each time you handle raw meat, poultry or eggs, as well as after using the restroom. And remember, "wash" doesn't mean a quick pass under the tap. Rub your hands together under warm running water, use soap, and be sure you clean all the surfaces of your hands and under the nails, then dry off thoroughly.

You don't have to wear a face mask if you have a cold when cooking, but do at least follow your mom's instruction from childhood to cover your mouth when you cough or sneeze. At a minimum, turn your face away from the work surface and your ingredients if you feel a sneeze coming on. Better yet, try to cough into your shoulder or inner arm. If you use your hand to cover a sneeze or cough, wash your hands again before returning to work to avoid transferring germs to the food or utensils you're using.

Think back to a time when you found a hair in your food and you'll understand why it's so important to keep your hair back from your face and away from the food you're preparing. You don't have to wear a lunch lady hair net in your own kitchen, but it doesn't hurt to pull long hair back into a ponytail to keep it out of the way. Make sure you don't have loose hairs on your clothes, because you don't want a stray hair to end up in your food. Don't run your hands through your hair while cooking, either. If you do by mistake, return to step one -- wash your hands.

There are a few additional personal hygiene steps you can take to prevent food contaminating. Don't stick your fingers into what you are preparing, whether to mix it or take a quick taste. In fact, handle the food you're preparing as little as possible; use tongs or utensils in place of hands whenever you can. Keep wounds bandaged, and wear gloves if you have cuts or sores on your hands. Wear clean clothes or an apron to prevent bacteria from dirty clothing getting into your food. And if you're sick, let someone else do the cooking.