Clean Hands, Safe Eats: The Art and Science of Handwashing in Foodservice Operations

Last week, I had the pleasure of joining one of our FoodHandler partners, Martin Bros. Distributing, for a Webinar on handwashing. During the webinar, we got into some of the nuts and bolts, and science, behind washing your hands.

I know this is likely an elementary topic to those of you who live and breathe food safety in the foodservice operations across our country everday, but it really goes beyond a routine task. Handwashing is both an art and a science and plays an extremely important role in preventing foodborne illnesses.

The technique is simple enough. It begins with wetting hands under clean, running water, applying an ample amount of soap, and lathering thoroughly, creating friction by rubbing your hands together, including between fingers and under nails. The soap, doing its job as a surfactant, helps to wash away the dislodged dirt, oils, and microorganisms from your hands. This process should never be just a quick “splash and dash” under running water. It should last for at least 20 seconds and will ensure you are keeping your hands clean and protecting your guests. Last, you should dry your hands with an air dryer, or single-use paper towel, with the single-use towel being my preferred and recommended method to dry your hands.

The art of handwashing, however, extends beyond technique and includes timing. There are those critical points in the food production process where food handlers must wash their hands. These are points I am sure those of you in foodservice could recite in your sleep:

BEFORE:

  • beginning food preparation tasks
  • handling clean dishes and utensils
  • donning a pair of single-use gloves

AFTER:

  • using the restroom
  • smoking, eating, sneezing, or drinking
  • handling raw meat, poultry, or seafood
  • touching any part of your hair, face, or clothing/aprons
  • handling soiled items (such as trash or cleaning tools)
  • handling chemicals
  • touching your cell phone or other mobile devices
  • removing soiled single-use gloves
  • changing tasks

While the art of handwashing focuses on technique and timing, the science behind it delves into microbiology. Our hands are natural reservoirs for bacteria, viruses, and other microorganisms, some of which can cause foodborne illnesses. Proper handwashing disrupts this microbial population, reducing the risk of contamination. Soap and friction are both vital in this process, this is why the recommendation is to scrub your hands for a specified amount of time.

I already mentioned that soap is a surfactant, otherwise known as a surface-active agent. Surfactants are used in a wide range of consumer and industrial products. In short, a surfactant helps to lower the surface tension between two substances and helps to lift dirt and oils from our hands during the washing and rinsing process. Soap also helps to create friction between your hands, which also aids in the removal of these items from the surface of the skin. Thus, I could not emphasize more how important soap is to the handwashing process.

Soap and friction are both vital in this [handwashing] process; this is why the recommendation is to scrub your hands for a specified amount of time.

Is water temperature important? Well, not so much. Friction and soap are key, but the fact is, water temperature isn’t critical. You are unlikely to be able to wash your hands with water hot enough to kill microbes without first scalding your hands. The key is to have a water temperature that is comfortable for employees.

The last step in handwashing is to dry your hands. Now, the food code permits food handlers to dry their hands in one of four ways: (1) individual, disposable towels, (2) a continuous towel system that supplies the user with a clean towel, (3) a heated-air hand drying device, or (4) a hand drying device that employ an air-knife system that delivers a high velocity, pressurized air at ambient temperatures. First, does anyone really use continuous towel systems anymore? But second, of these four methods, the research has continuously noted that the best method to dry hands is by using the individual (single use) disposable towel. Not only is it more effective and efficient in the drying process, it removes more bacteria from the hands (again, the friction is important), and causes less contamination.

Check back later this month for our second blog post for May. I want to expand on our handwashing discussion and discuss why employees don’t wash their hands and some considerations to help improve handwashing compliance. Risk Nothing.

Evaluating Food Safety

One of the suggestions I made in the last blog was to assess the food safety culture in your organization by observing the food handling techniques of workers. Let’s explore that some more. You can do an overall assessment or you can hone in on specific areas of the operation, such as production or cleaning practices. Remember, when the environmental health inspector visits your operation, he/she just gets a snapshot of what is going on in your operation on that particular day at that specific time. You are there nearly every day, so you have a much better understanding on what really happens in your operation.

September is Food Safety Education Month: The Culture of Food Safety

Developing a culture of food safety is important for any foodservice operation. You may be wondering--just what is a culture of food safety? Let’s start talking about it by first defining what is meant by culture. When you look culture up in the dictionary, you will see terms such as shared knowledge, beliefs, values, attitudes, and meanings; a way of life; patterns of behavior; learned behavior of a group of people; and transmitted from generation to generation. I think these descriptors provide good insight into the meaning of a culture of food safety. You can also think about where you grew up, and a vision of culture comes. For example, I grew up in rural Oklahoma, graduating in the 1970’s with a class of 24 students. My culture instilled in me an appreciation for rural life, hard work, and independence. As I grow older, I realize I haven’t changed very much from my early years, even though I have completed a PhD, lived a lot of places, and traveled throughout the world!

Produce Safety: Special Considerations

In our last blog, I talked about general produce safety. Today, I want to talk about some special products—melons, tomatoes, leafy greens, and sprouts. These are all foods that have a history of bacterial contamination leading to foodborne illness. I also want to discuss salad bars because they have some special risks.