Packed lunches sitting in backpacks and school lockers for hours pose a serious food safety risk, especially as the school year begins. The biggest challenge is keeping perishable foods at safe temperatures until lunchtime. Foods like deli meat, yogurt, cut fruit, eggs, and leftovers need to stay at 40 degrees Fahrenheit or below, but many families don't realize how quickly bacteria can multiply when lunch boxes are left unrefrigerated.

Every single year, 1 in 6 Americans experience foodborne illness, according to food safety experts at the University of Minnesota. As National Food Safety Education Month kicks off this September, researchers are emphasizing practical strategies that families can use right now to protect their children.

How Can You Keep Packed Lunches Safe?

• Use Insulated Containers: Pack lunches in an insulated lunch bag with at least two cold sources, such as frozen gel packs or a frozen water bottle along with an ice pack, to maintain proper temperature throughout the day.
• Refrigerate Immediately: If your child's school has a refrigerator, encourage them to place their lunch there as soon as they arrive, rather than leaving it in a locker or backpack.
• Choose Shelf-Stable Options: Select foods that don't require refrigeration, such as whole fruit, crackers, peanut butter, and other shelf-stable items that are naturally safer for packed lunches.
• Use Preheated Containers for Hot Foods: For hot foods like soup or chili, use a preheated insulated container and keep it closed until lunchtime to maintain safe temperatures above 140 degrees Fahrenheit.
• Start with Clean Hands and Containers: Wash your hands thoroughly, clean your lunch box regularly, and use clean containers when packing food to prevent cross-contamination from the start.

"The biggest challenge with packed lunches is temperature. Foods like deli meat, yogurt, cut fruit, eggs and leftovers should stay at 40 degrees Fahrenheit or below until lunchtime," explained Hanyu Chen, Extension specialist and assistant professor in the College of Food, Agricultural and Natural Resource Sciences at the University of Minnesota.

Hanyu Chen, Extension Specialist and Assistant Professor, University of Minnesota College of Food, Agricultural and Natural Resource Sciences

How Do You Know If Food in Your Fridge Is Actually Safe to Eat?

One of the most common misconceptions about food safety is that expiration dates tell you whether food is safe. In reality, labels like "Best if Used By" generally refer to quality, not safety. The exception is infant formula, which does carry a genuine safety deadline.

For leftovers, time and temperature matter far more than appearance or smell. Most cooked leftovers should be refrigerated promptly and used within three to four days, or frozen for later consumption. Relying only on your nose or a small taste test is risky because some harmful microorganisms can be present without obvious signs of spoilage.

"I do not recommend people rely only on smell, appearance or a small taste test to decide whether your food is safe. Some harmful microorganisms can be present without obvious signs of spoilage," noted Chen.

Hanyu Chen, Extension Specialist and Assistant Professor, University of Minnesota College of Food, Agricultural and Natural Resource Sciences

Instead, think about how the food was handled. Was it kept cold? How long has it been in the refrigerator? If you cannot answer those questions confidently, throwing it away is the safer choice.

What About Tailgating and Holiday Gatherings?

As tailgating season and the holidays approach, outdoor food gatherings present their own food safety challenges. The key principles remain simple: keep cold food cold, hot food hot, prevent cross-contamination, and use a food thermometer.

Raw meat requires special handling at outdoor events. Keep raw meat separate from ready-to-eat foods like salads and fruit to prevent juices from dripping onto them. Cold foods should stay at 40 degrees Fahrenheit or below in a well-iced cooler, while hot foods need to stay at 140 degrees Fahrenheit or above. Perishable foods should not sit out for more than two hours at room temperature, or more than one hour when outdoor temperatures exceed 90 degrees Fahrenheit.

When grilling, use a clean plate for cooked food rather than the plate that held raw meat. A food thermometer takes the guesswork out of cooking, especially for burgers and poultry. During busy gatherings, assigning one person to monitor food temperatures and storage can be surprisingly effective at preventing foodborne illness.

Why Do Food Recalls Feel More Frequent Than Ever?

It may feel like food recalls are constantly in the news, but recall activity varies over time. One contaminated ingredient can trigger multiple related product recalls simultaneously, which can make the situation seem worse than it is. The most important question for consumers is not how many recalls are happening overall, but whether a specific recall matches something in their own kitchen.

When checking for recalls, verify the brand, product name, package size, lot number, UPC code, and "use by" or "best by" dates listed in the official recall notice. FoodSafety.gov is a reliable resource that tracks current FDA and USDA recall information. If you have a recalled product, do not eat it. Follow the official notice for returning or disposing of it, and remember to clean any surfaces the product may have contacted.

If you believe a recalled food made you sick, contact a healthcare provider and follow the reporting guidance in the recall notice. This information helps public health officials track outbreaks and prevent further illnesses.

How Is Food Safety Research Improving Local Food Systems?

University of Minnesota researchers are working to connect food safety science with practical solutions that people and food businesses can actually use. This includes guidance for cottage food producers, small processors, and other food entrepreneurs on safe food processing, sanitation, shelf-life management, and microbial control.

Emerging technologies like UV lights and non-toxic organic acids show promise for controlling harmful microorganisms while maintaining food quality and nutrition. By translating university research into tools, training, and practical decisions, experts hope to make local foods safer and support a strong food economy within Minnesota and beyond.