How Expiration Dates Actually Work (Stop Throwing Away Good Food)

Food expiration dates are often misunderstood. Many package dates relate to quality or store inventory rather than a moment when food suddenly becomes unsafe, but rules and label wording vary by country and product. Safe decisions also depend on storage temperature, handling, packaging, recalls and the type of food—not the printed date alone.

How food expiration dates work

First identify the exact wording on the package and the guidance that applies where you live. In the United States, USDA’s food product dating guidance explains that, except for infant formula, federal regulations generally do not require product dates. Other countries and regions may regulate labels differently, so local food-safety authorities and the package instructions remain important.

A date cannot compensate for unsafe storage. Perishable food held too warm, cross-contaminated or left out too long may be unsafe before its package date.

Understand common date-label terms

Best if used by or best before

This wording commonly communicates when the manufacturer expects the product to have its best flavor or quality. It should not be treated as a universal safety guarantee before the date or automatic discard instruction after it.

Sell by

A sell-by date is generally intended to help retailers manage display and stock rotation. Consumers still need to follow storage guidance and product-specific recommendations.

Use by

The meaning of “use by” depends on the product and jurisdiction. Do not assume it has the same legal or safety meaning everywhere. Follow any mandatory local rule and special instructions for high-risk or regulated products.

Freeze by

This can indicate when freezing is recommended to help maintain quality. It does not replace safe freezing, thawing and cooking practices.

Treat infant formula as a special case

Do not use infant formula after its labeled use-by date. The U.S. FDA states that every infant-formula container must carry a use-by date and advises caregivers not to use it afterward. See the FDA’s current infant formula safety guidance. Caregivers outside the United States should follow their national authority and the product label.

Do not rely on a look-smell-taste test for safety

Appearance and odor can reveal obvious spoilage, damaged packaging or mold, but harmful microorganisms may be present without changing how food looks, smells or tastes. Never taste questionable food to decide whether it is safe. When storage history is unknown, a recall applies or official guidance says to discard the item, throw it away.

• Discard leaking, bulging or severely damaged packages.
• Follow recall notices even when the food appears normal.
• Keep raw foods separate from ready-to-eat items.
• Use a thermometer where cooking temperature matters.
• Give extra care to food for pregnant people, young children, older adults and people with weakened immune systems.

Use product-specific storage guidance

Different foods have very different safe storage windows. Avoid universal rules such as “all yogurt is fine for a week” or “all canned food lasts several years.” Preparation, whether a package is open, refrigerator temperature and the specific product can change the recommendation.

FoodSafety.gov’s cold food storage chart provides refrigerator and freezer guidance, while the official FoodKeeper resource covers many individual foods. Readers elsewhere should check equivalent local guidance.

Check the complete storage history

1. Identify whether the food is shelf-stable, refrigerated or frozen.
2. Check whether the package has been opened.
3. Confirm that required temperatures were maintained.
4. Review the package instructions and official product guidance.
5. Check recalls and inspect the packaging for damage.
6. Discard the food when its history is uncertain and safety cannot be established.

Reduce waste before dates become confusing

Good organization prevents many last-minute decisions. Place foods that should be used soon where household members can see them, label opened packages and leftovers with dates, and avoid buying duplicates. A pantry and refrigerator audit before shopping can help.

• Use first-in, first-out rotation where practical.
• Freeze suitable food while it is still in good condition.
• Plan one flexible meal around ingredients needing attention.
• Buy package sizes that match realistic use.
• Keep storage instructions with repackaged food.

Plan meals around food that needs attention

Move safe, correctly stored ingredients into the next meal plan rather than waiting until the last possible day. The Use It Up Challenge offers a flexible refrigerator-first workflow, and these meal-prep rules for reducing produce waste can help smaller households.

Create a household date-label routine

When unpacking groceries, keep the original label visible, note when highly perishable packages are opened and store foods promptly. Once a week, review the refrigerator and freezer before writing the next list. Tracking discarded items alongside your household grocery cost can reveal recurring overbuying.

Use dates as one part of a safe decision

Food expiration dates and related labels are useful only when interpreted with product-specific rules, storage history and official guidance. Do not discard every item automatically at a quality date, but never use a printed date—or a quick smell or taste—as proof of safety. When in doubt about a high-risk food, follow your local food-safety authority or discard it.