How to Choose Reliable Food Storage Guidance
Where trustworthy food storage advice comes from, what "best by" and "use by" dates really mean, and the common myths worth ignoring.
Start With the Experts
Shelf-life advice online often has no source at all. For food safety, the most reliable information comes from government food safety agencies and university extension services, which base their advice on research:
- FoodSafety.gov and the USDA Food Safety and Inspection Service (FSIS): storage charts, safe cooking temperatures, and handling advice.
- The USDA FoodKeeper app: storage times for hundreds of foods, developed by USDA FSIS with Cornell University and the Food Marketing Institute.
- The FDA: guidance on seafood, produce, and food labels.
- The National Center for Home Food Preservation (University of Georgia): tested methods for canning, freezing, drying, and fermenting.
- Your state's Cooperative Extension service, often run by a public university.
What Package Dates Mean
Except for infant formula, US federal law doesn't require date labels on food, and most dates are about quality, not safety:
- "Best if used by": when the food will taste best. The USDA recommends this wording.
- "Sell by": a guide for the store's stock rotation. You can usually still use the food after this date if it's been stored properly.
- "Use by": the last date recommended for peak quality. On infant formula, it's a safety date.
- Eggs: often fine for 3-5 weeks after you buy them, even if the sell-by date passes.
Temperature Matters Most
Storage times assume your fridge is at 40°F (4°C) or colder and your freezer at 0°F (-18°C). Many fridges run warmer than people think. An inexpensive appliance thermometer on a middle shelf tells you for sure.
Frozen food kept at 0°F stays safe indefinitely, because bacteria can't grow. Freezer times on storage charts are about taste and texture, which slowly decline.
Common Myths
A few beliefs that sound reasonable but aren't reliable:
- "If it smells fine, it's fine." The bacteria that cause illness often don't change the smell or look of food.
- "Cut off the mold and the rest is OK." True for hard cheese and firm vegetables (cut at least 1 inch around the spot). Not for soft foods like bread, soft cheese, yogurt, or leftovers, where mold spreads below the surface.
- "Let food cool before refrigerating." Leaving it out longer is the bigger risk. Refrigerate within 2 hours.
- "Reheating kills everything." Some bacteria make toxins that heat doesn't destroy, so reheating can't rescue food that's been left out too long.
Home Canning Is Its Own Subject
Canning low-acid foods incorrectly can allow Clostridium botulinum to grow, which causes botulism. Only use tested recipes and processing times from sources such as the National Center for Home Food Preservation, the USDA Complete Guide to Home Canning, or Ball. Don't change the amounts of acid, sugar, or vegetables in a tested canning recipe.