Food Hygiene Temperatures

[Colleen Bramham]

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Leaving food out too long at room temperature can cause bacteria (such as Staphylococcus aureus, Salmonella Enteritidis, Escherichia coli O157:H7, and Campylobacter) to grow to dangerous levels that can cause illness. Bacteria grow most rapidly in the range of temperatures between 40 F and 140 F, doubling in number in as little as 20 minutes. This range of temperatures is often called the "Danger Zone."

Cooking

Raw meat and poultry should always be cooked to a safe minimum internal temperature (see graphic). When roasting meat and poultry, use an oven temperature no lower than 325 F.

Storing Leftovers

One of the most common causes of foodborne illness is improper cooling of cooked foods. Bacteria can be reintroduced to food after it is safely cooked. For this reason leftovers must be put in shallow containers for quick cooling and refrigerated at 40 F or below within two hours.

The top priority in a commercial kitchen is understanding and enforcing food safety temperatures. Neglecting them can put customers at serious risk of contracting foodborne illnesses. To ensure food safety, foodservice operators and handlers must understand the temperature danger zone and its impacts. We'll explain the danger zone temperature range, which foods are most at risk, and how to prevent food from lingering at hazardous temperatures.

The danger zone refers to the temperature range that accelerates bacteria growth in food. According to ServSafe recommendations (an authority on foodservice training material), food temperatures between 41 and 135 degrees Fahrenheit represent this danger zone (5 and 57 degrees Celsius). Bacteria thrive and multiply most rapidly between temperatures of 70 and 125 degrees Fahrenheit. The longer food sits in the temperature danger zone, the greater the risk that bacteria will grow.

When foods are allowed to enter the temperature danger zone, bacteria may grow to unhealthy levels and cause the food to spoil. Dangerous bacteria growth like this may occur without any visible signs that the food is unsafe for consumption. Foods may smell and appear normal but could contain harmful amounts of bacteria that will cause foodborne illness.

Time temperature abuse is the act of allowing foods to stay in the temperature danger zone of 41 to 135 degrees Fahrenheit. Along with cross-contamination, time temperature abuse is a common source of foodborne illness, making it a major health code violation. Foods may become time-temperature abused in three ways:

TCS stands for time/temperature control safety. Foods that require strict time and temperature control are considered TCS foods. Pathogens love TCS foods because they present an ideal environment for germs to grow and spread. Preventing TCS foods from entering the danger zone and becoming time-temperature abused is a critical food safety practice. These are the high-risk TCS foods that should be closely monitored at all times:

ServSafe states that 4 hours is the maximum length of time ready-to-eat foods can stay in the temperature danger zone. After the 4-hour limit, foods are considered spoiled and must be thrown away. Within the 4-hour time limit, foods can be consumed, reheated, or chilled to bring them back to food safe temperatures. Checking temps every 2 hours allows for a greater window to perform any necessary corrective actions.

Kitchen thermometers are the key to keeping foods out of the temp danger zone. By monitoring and recording food temperatures regularly, you can prevent foods from becoming time-temperature abused. This is imperative while prepping, cooking, and holding food on your buffet line or salad bar.

Salad bars and refrigerators need to maintain temperatures at 40 degrees Fahrenheit and below to prevent the growth of dangerous bacteria. This is especially important as you house vulnerable TCS foods including cheese, yogurts, meats, salad dressings, and egg products.

If you're preparing food ahead of time and placing it into cold storage for holding, it has to be properly cooled first. Once your menu item has reached its proper internal temperature, it is essential to quickly bring the temperature down through the danger zone. Cool your food to 70 degrees Fahrenheit within 2 hours and then further down to 41 degrees Fahrenheit within 4 hours.

Though it seems like the simplest option, placing hot food directly into your refrigerator or freezer is never recommended because it endangers the food around it by raising the ambient temperature in your fridge or freezer. This creates the possibility of other foods in your refrigerator or freezer entering the temperature danger zone and developing bacteria without you even knowing. Instead, follow these tips for quickly cooling your hot foods.

One of the most common examples of time temperature abuse in a kitchen is defrosting food incorrectly. It can be tempting to leave food out on the counter to thaw or run it under hot water, but these put your foods at risk of entering the danger zone. Use the following methods to defrost food safely:

Along with concerns for the danger zone, you'll also want to make sure your foods have reached safe internal temperatures for at least 15 seconds before they can be served. Below is a temperature guide for some of the most common ingredients.

It's every food service operator's top priority to keep the food they're serving safe for consumption. Following these important tips and getting your staff food handling certified will ensure that they have the knowledge to keep food out of the danger zone, take corrective action, and protect customers from foodborne illnesses.

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Fact: Using color isn't a good way to determine whether meat has been cooked to a safe internal temperature. It's how much heat is in the middle of the meat that matters. The only way to know that meat has been cooked to a safe internal temperature is to use a food thermometer. Be sure to cook meats to the following minimum internal temperatures:

Fact: Hot food can be placed in the refrigerator. Large amounts of food should be divided into small portions and put in shallow containers for quicker cooling in the refrigerator. Perishable foods should be put in a refrigerator that is 40 degrees or below within 2 hours of preparation. If you leave food out to cool and forget about it after 2 hours, throw it away. Bacteria can grow rapidly on food left out at room temperature for more than 2 hours. If food is left out in a room or outdoors where the temperature is 90 degrees F or hotter, food should be refrigerated or discarded within just 1 hour.

Fact: Some bacteria, such as staphylococcus (staph) and Bacillus cereus, produce toxins not destroyed by high cooking temperatures. Refrigerate perishable foods within 2 hours in a refrigerator temperature of 40 degrees or below.

Fact: Bacteria can survive freezing temperatures. Freezing isn't a method for making foods safe to eat. When food is thawed, bacteria can still be present and may begin to multiply. Cooking food to the proper internal temperature is the best way to kill harmful bacteria.

Fact: If raw foods such as meat, poultry, egg products, and seafood have been thawed in the refrigerator, then they may be safely re-frozen for later use. Never thaw raw foods by letting them sit on the counter. If raw foods are thawed outside the refrigerator, for example in the microwave or in cool water, they should be cooked immediately. Never re-freeze raw or not fully cooked foods that have been thawed outside the refrigerator.

Fact: Any type of cutting board can hold harmful bacteria on its surface. Regardless of the type of cutting board you use, it should be washed and sanitized after each use. Solid plastic, tempered glass, sealed granite, and hardwood cutting boards are dishwasher safe. However, wood laminates don't hold up well in the dishwasher. Any type of cutting board should be discarded if it becomes excessively worn or develops hard-to-clean grooves.

Fact: Fruits and vegetables are an important part of a healthy diet, but like other foods they may carry a risk of foodborne illness. You should wash fresh fruits and vegetables under running tap water just before eating, cutting, or cooking. Harmful bacteria could be on the outside of the produce. If you peel or cut it without first washing it, the bacteria could be transferred to the part you eat. Wash delicate produce such as grapes or lettuce under cool running water. Blot dry with a clean cloth towel or paper towel. Rub firm-skin fruits and vegetables under running tap water or scrub with a clean produce brush. Never use detergent or bleach to wash fresh fruits or vegetables.

Fact: While it is important to thoroughly wash most fresh fruits and vegetables, if packaged greens are labeled "ready-to-eat," "washed," or "triple washed" then the product doesn't need to be washed at home. Pre-washed greens have been through a cleaning process immediately before going into the bag. Re-washing and handling the greens creates opportunities for contamination.

Fact: Organic and locally grown foods may have environmental benefits such as using less pesticides, fertilizers, and fossil-fuels. But these foods, like others, can be exposed to harmful bacteria during the growing and harvesting process. It's important for farmers and distributors to use good sanitary practices to minimize food contamination. Consumers should always prepare and cook food properly, no matter where it's from.

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