Why Expiration Dates Are Important on Food Products

Everyone · Explainer · Updated October 1, 2026 · LearnLife Editorial

What Are Expiration Dates on Food Products?

Expiration dates are printed labels on food packaging indicating recommended consumption or sale periods. They are developed through testing food stability, spoilage rates, and safety concerns by manufacturers. These dates aim to inform consumers about the freshness and safety of the product. Common terms include “Use By,” which is often the last date considered safe to eat the food; “Best Before” or “Best If Used By,” which highlights peak quality but not necessarily safety; “Sell By,” a date intended for stores to manage stock; and “Expires On,” which advises when the product should no longer be consumed. These labels are guides rather than absolute rules because factors like how the food is stored and handled also affect safety.

For example, a loaf of bread might have a “Best Before” date to indicate when the texture and flavor are optimal, but it may still be safe to eat a few days after that if there are no signs of mold. On the other hand, a package of raw chicken marked with “Use By” should not be eaten beyond that date because bacteria could cause illness.

How Do Expiration Dates Work? A Hypothetical Example

Expiration dates work by estimating how long a product can retain safety and quality under typical storage conditions. Suppose you buy a carton of orange juice labeled “Use By May 10.” This date means the manufacturer guarantees the juice will be safe and taste its best if refrigerated properly by that date. If you drink the juice on May 9, it should taste fresh and be safe. If you consume it on May 12, the juice might have started to ferment or develop harmful bacteria, posing a health risk.

Storage conditions heavily influence this timeline. If that same juice were left unrefrigerated for several hours on a warm day, bacteria could grow quickly, making it unsafe even before May 10. Conversely, freezing the juice might extend its safe use beyond the date but could alter taste and texture.

This example shows expiration dates are based on careful testing combined with assumptions about storage. Consumers need to follow storage instructions closely and use senses (smell, taste, appearance) to judge safety beyond just the printed date.

Why Do Expiration Dates Matter for Everyone?

Expiration dates matter because they help protect people from foodborne illnesses caused by consuming spoiled or contaminated food. Illnesses range from mild digestive upset to severe infections that require hospitalization. Children, older adults, pregnant people, and those with weakened immune systems are especially vulnerable to these risks.

Beyond health, expiration dates help households reduce food waste and save money. For instance, if you notice that a carton of yogurt is nearing its “Use By” date, planning to eat it first prevents it from spoiling in the fridge. Without attention to these dates, consumers might throw away food prematurely or risk eating spoiled items.

Understanding expiration dates also supports proper food storage habits. If you know a product expires soon, you might store it in the coldest part of your fridge or consume it quickly. This awareness fosters safer eating habits and better meal planning.

What Are the Different Terms Used on Food Labels and How Do They Differ?

Expiration-related labels can cause confusion because they sound similar but serve different purposes. Here’s a clear breakdown:

For example, deli meats often have a “Use By” date because they spoil quickly, while dry pasta may have a “Best Before” date, reflecting quality rather than safety. This explanation helps consumers decide when to trust the date strictly and when to rely on other indicators.

Can Expiration Dates Always Be Trusted for Food Safety?

Expiration dates provide important safety guidelines but are not infallible. Their reliability depends on proper storage and handling throughout the product’s life. For example, canned goods can remain safe well beyond expiration if unopened and stored in a cool, dry place. However, if the can is dented, rusted, or bulging, the food inside could be unsafe regardless of the date.

Similarly, fresh produce does not always come with expiration dates, so consumers must use sensory checks and knowledge of spoilage signs. Dairy products like milk or cheese may spoil faster if left out too long, regardless of the date printed.

Consumers should use expiration dates as one of several tools to assess food safety. When in doubt, trust your senses and err on the side of caution. Toss any food with unusual smells, colors, textures, or signs of mold, even if the expiration date hasn’t passed.

What Should You Do to Use Expiration Dates Effectively?

To use expiration dates well, follow these practical steps:

1. Read All Dates Carefully: Check for “Use By,” “Best Before,” or “Sell By” to understand what the date means.
2. Shop Smart: Choose products with later expiration dates when possible to maximize freshness.
3. Store Food Correctly: Refrigerate perishables promptly, keep dry goods in cool, dry places, and follow package instructions.
4. Plan Meals: Organize your fridge and pantry so foods nearing their expiration dates are used first.
5. Inspect Food Before Eating: Smell, look at, and when safe, taste small amounts to detect spoilage.
6. Freeze When Appropriate: Freeze foods before expiration to extend their safe use, but use proper thawing methods.
7. Dispose Responsibly: Discard food showing spoilage signs, damaged packaging, or questionable safety, even if the date isn’t passed.

For example, if you buy yogurt with a “Use By” date in three days, plan to eat it within that time or freeze it for later. If you find canned beans with a “Best Before” date six months ago but the can is intact, inspect carefully before use.

What If You’re Unsure About a Food Product’s Safety After the Expiration Date?

If you encounter food past its expiration date and feel uncertain, follow these guidelines:

• Assess Packaging: Check for dents, leaks, rust, or bulging cans; these indicate contamination risk.
• Use Your Senses: Look for discoloration, mold, off smells, or sliminess. If any are present, discard the food.
• Check Storage History: Consider if the food was stored according to instructions. Improper storage shortens safe use.
• When in Doubt, Throw It Out: The risk of foodborne illness outweighs the cost of replacement.
• Seek Help When Needed: If you experience symptoms of food poisoning, contact a healthcare provider. If you have questions about food safety, local health departments or food safety websites can provide guidance.

For example, if you find a container of leftover pasta with a “Use By” date from five days ago but it smells sour and looks slimy, discard it immediately. If symptoms like nausea or diarrhea develop after eating questionable food, contact a medical professional.

Understanding and respecting expiration dates helps protect your health while minimizing waste. For further reading, explore What Expiration Dates on Food Mean for Safety and Can Expiration Dates Be Trusted for Food Safety?.

Frequently asked questions

Can I eat food after the "Best Before" date if it looks and smells fine?

Yes, “Best Before” dates relate to quality, not safety. If food smells and looks normal, it is generally safe to eat after this date, though taste and texture might be affected.

How can I safely freeze foods to extend their shelf life?

Freeze foods before the expiration date to slow bacterial growth. Use airtight containers or freezer bags to prevent freezer burn. Label frozen items with the date and use them within recommended freezer storage times.

Why do some foods have no expiration dates?

Some foods like fresh fruits, vegetables, or bulk dry goods may not require expiration dates by law. Consumers should use sensory checks and proper storage to determine freshness.

Is it safe to consume canned foods if the expiration date has passed?

If the can is intact with no dents, rust, or swelling, canned food may be safe beyond its expiration date. However, quality may decline, and any damage to the can requires discarding the food.

What should I do if a store sells food past its expiration date?

Retailers are generally expected to remove expired products. If you find expired food for sale, notify store management or your local consumer protection agency to ensure food safety compliance.

How do expiration dates affect meal prepping and leftovers?

Meal preppers should label containers with preparation and expiration dates. Leftovers typically last 3-4 days refrigerated. Use expiration dates on original ingredients as a guide, and consume leftovers promptly to avoid waste and illness.