Understanding the difference between “best by” and “use by” dates can save you from serious foodborne illness. Best by dates indicate peak quality, but “use by” dates mark genuine safety deadlines set by the USDA and FDA. Some foods become genuinely dangerous when consumed past their use by date, not just less appealing. The CDC reports that approximately 48 million Americans get foodborne illness each year, with 128,000 hospitalizations and roughly 3,000 deaths. Many of these cases trace back to expired foods in home kitchens.
This article focuses on seven categories of food that the USDA and FDA identify as requiring strict adherence to use by dates. Unlike shelf-stable items that deteriorate slowly in quality, these foods can harbor dangerous pathogens like E. coli, Listeria, and Salmonella within days or weeks of their marked dates. Eating them past expiration puts your household at serious risk.
1. Ground Beef and Ground Poultry
Ground beef, ground turkey, and ground chicken are prime candidates for bacterial contamination because grinding increases surface area and mixes bacteria throughout the meat. The USDA specifies that ground meat has a use by date of one to two days after purchase, and this is not negotiable if you want to avoid E. coli, Salmonella, and Campylobacter. When ground meat sits in your refrigerator past this window, pathogenic bacteria multiply rapidly, even at safe refrigerator temperatures.
An individual foodborne illness case from contaminated ground meat sends approximately $600 to $3,500 in emergency room and urgent care charges, not counting lost work days or prescription costs. If hospitalization becomes necessary due to severe E. coli or Salmonella infection, you face bills exceeding $10,000, along with weeks of recovery time. Proper disposal at the use by date prevents these outcomes.
If you purchase ground meat without immediate cooking plans, freeze it the same day. Label the package with the current date so you know when you froze it. Thaw only what you need in the refrigerator before cooking, and use the thawed meat within 24 hours for maximum safety. Connect this practice with other high-risk foods in your refrigerator that breed bacteria quickly.
2. Deli Meats and Lunch Meats
Deli meats carry a disproportionately high risk of Listeria monocytogenes contamination. The Mayo Clinic notes that Listeria is particularly dangerous for pregnant women, newborns, and immunocompromised individuals, with a mortality rate around 20 percent if systemic infection occurs. The CDC has documented multiple outbreaks tied to deli meat consumption, and unopened packages have a use by date that you must respect. Once opened, most deli meats become unsafe within 3 to 5 days regardless of the original package date.
A Listeria infection can result in $600 to $3,500 in emergency medical costs, but severe cases involving hospitalization, sepsis, or meningitis can exceed $15,000. The infection often causes miscarriage in pregnant women or severe complications in newborns. Discarding deli meats at their use by date eliminates this particular pathogen risk from your kitchen.
Store unopened deli meat packages in the coldest part of your refrigerator (typically the back of the bottom shelf). Once opened, place remaining slices in an airtight container and mark the open date. Throw away any opened package after five days. For a safer option, purchase fresh roasted turkey or chicken from the deli counter, use it immediately, and avoid extended storage. See our guide to foods that deteriorate quickly in cold storage for complementary strategies.
3. Raw Poultry and Raw Fish
Raw chicken, turkey, and other poultry can contain Salmonella on the surface and throughout the meat. The USDA mandates a use by date of one to two days for raw poultry. Raw fish and shellfish present additional dangers, including Scombroid poisoning (from improper temperature history) and Vibrio species, which multiply in warm or improperly cooled seafood. Purchase raw fish and poultry from reputable suppliers only, verify the use by date immediately upon purchase, and cook them within the specified window.
Salmonella infection typically results in acute gastroenteritis and emergency room visits costing $600 to $2,000, plus lost work wages of $200 to $800 depending on illness severity and duration. Scombroid poisoning from aged fish causes severe allergic-like reactions requiring emergency care. A single foodborne illness episode from expired raw poultry or fish can cascade into hospitalization, requiring $10,000 to $25,000 in medical costs.
Never thaw poultry or fish on the kitchen counter. Plan ahead and transfer frozen items to the refrigerator 24 hours before cooking. If you thaw meat in cold water, change the water every 30 minutes and cook immediately afterward. These foods deteriorate rapidly even under ideal refrigeration. Check pantry and freezer organization strategies to ensure you rotate stock properly and use older items first.
4. Soft Cheeses and Fresh Dairy
Soft cheeses like Brie, feta, fresh mozzarella, and chèvre can harbor Listeria both before and after purchase. Unlike hard cheeses, which develop protective molds and natural barriers, soft cheeses lack these safeguards and allow bacterial growth. The USDA specifies strict use by dates for all soft cheese products. Additionally, unpasteurized dairy products and raw milk cheeses carry heightened risks and must never be consumed past their use by dates, even if they appear normal or smell acceptable.
A Listeria infection stemming from soft cheese can require hospitalization, resulting in $10,000 to $20,000 in medical charges, especially for pregnant women or those with compromised immunity. Replacement of contaminated soft cheeses from your fridge adds another $30 to $100 depending on the varieties you purchased. The cumulative household cost quickly exceeds $10,000 when hospitalization is factored in.
Purchase soft cheeses close to when you plan to serve them. Store them in the coldest section of your refrigerator and never leave them at room temperature for more than two hours. If you open a container and do not use the entire contents immediately, note the open date and discard after five days. Avoid unpasteurized dairy products unless you are confident in the source and handling. Connect this with refrigerator maintenance practices that ensure consistent cold temperatures.
5. Pre-Cut Produce and Fresh Vegetables
Pre-cut cantaloupe, watermelon, leafy greens, and pre-made salad mixes carry a significant risk of E. coli and Salmonella contamination because cutting exposes internal surfaces to pathogens. The CDC has linked multiple E. coli outbreaks to cut melons sold in stores and consumed within days of the printed date. Pre-cut produce has a shorter safe window than whole produce, typically 3 to 5 days, and must be purchased close to consumption time. If no use by date appears, assume a maximum of 5 days from purchase.
An E. coli infection from contaminated produce can cause bloody diarrhea, hemolytic uremic syndrome, and acute kidney injury, resulting in hospitalization costs exceeding $20,000. Even mild E. coli infections generate $800 to $1,200 in urgent care and antibiotic costs plus lost work time. Replacing spoiled pre-cut produce adds another $40 to $80 per shopping cycle if you purchase frequently.
Buy pre-cut produce only when you intend to consume it within 24 hours. Store it in the coldest part of your refrigerator, separate from raw meats. Whole produce like whole heads of lettuce, intact melons, and unwashed spinach last longer and present lower contamination risk. If you notice slime, odor, or discoloration on any pre-cut item, discard it immediately even if the date suggests it should still be safe. See cross-contamination risks in your kitchen for related hygiene practices.
6. Leftovers Beyond Four Days
The USDA and FDA guidelines state that properly stored cooked leftovers must be consumed or discarded within 4 days of cooking. This applies to all cooked proteins, cooked vegetables, soups, stews, and mixed dishes. Many home cooks believe leftovers are safe as long as they smell normal, but bacterial growth in cooked food does not always produce detectable odors or visual signs. Staphylococcus aureus and Clostridium perfringens can grow silently in stored leftovers, causing severe food poisoning.
Foodborne illness from aged leftovers generates emergency room visits averaging $700 to $2,500, plus additional costs if hospitalization is required. Lost work days from illness typically cost $200 to $400 in foregone wages for a four to seven day recovery period. Replacing spoiled meals that you failed to eat costs an additional $50 to $150 depending on the original ingredients.
Label all leftover containers with the date and time you prepared them. Store leftovers in shallow, airtight containers in the coldest part of your refrigerator. Reheat to 165 degrees Fahrenheit before eating. If you cannot eat leftovers within 4 days, freeze them immediately and use frozen leftovers within 3 to 4 months. Create a system to rotate older containers to the front so you use them first. Reference storage organization best practices to build sustainable leftover management habits.
7. Fresh Eggs Past Three Weeks
Fresh eggs in the shell can contain Salmonella on the shell surface and, rarely, inside the egg itself. The USDA specifies that fresh eggs are safe for about 3 to 5 weeks from the packing date (which may differ from the purchase date printed on cartons). After this window closes, the risk of Salmonella contamination increases. Hard-boiled eggs must be used within 7 days of cooking and discarded afterward. Do not rely on appearance or smell to judge egg safety.
Salmonella from raw or undercooked eggs causes gastroenteritis with potential hospitalization, particularly in young children, elderly individuals, and immunocompromised people. Medical costs from severe Salmonella infection run $800 to $3,000 for outpatient care and $10,000 to $15,000 if hospitalization and IV fluids are necessary. Replacement of contaminated eggs and spoiled dishes prepared with them adds another $20 to $50.
Check the pack date (three-digit number representing the day of year the eggs were packed) on each carton you purchase. Buy eggs close to when you plan to use them. Store eggs in the coldest part of your refrigerator, not on the door where temperatures fluctuate. Cook eggs thoroughly until both whites and yolks are firm, especially for vulnerable populations. Never consume raw cookie dough, homemade mayo, or hollandaise prepared with eggs older than 2 weeks. Explore tools that help with proper food storage and preparation.
What Actually Works: Food Safety as a Kitchen Foundation
The most effective approach to preventing foodborne illness begins with respecting use by dates as absolute deadlines rather than guidelines. Start by organizing your refrigerator so older items sit at eye level and newer purchases go to the back. Implement a simple label system marking the date you open or purchase each item. These low-cost habits prevent the 10,000 to 25,000 dollar medical costs and weeks of illness that follow a serious foodborne infection.
Buy smaller quantities of perishable items and purchase more frequently rather than stocking large quantities intended to last weeks. Maintain your refrigerator temperature at 40 degrees Fahrenheit or below, and verify this monthly with an inexpensive thermometer. When in doubt about an item’s safety status, discard it. The cost of replacing questionable food is minimal compared to hospitalizations tied to Listeria, E. coli, and Salmonella. These concrete practices, guided by USDA, FDA, and CDC standards, protect your household effectively and cost far less than treating preventable illness.
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