Can Expiration Dates Be Trusted for Food Safety?

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

What Are Expiration Dates on Food?

Expiration dates on food are labels provided by manufacturers to signal the period during which the product is expected to maintain its best quality or be safe to eat. Common terms seen on packaging include "Use By," "Best Before," "Sell By," and "Expires On." These dates are meant to guide consumers on freshness and safety but do not always mean the food is unsafe immediately after that date. Instead, they reflect when the food might start to lose flavor, texture, or nutritional value.

For example, "Best Before" usually refers to quality rather than safety, while "Use By" is often found on perishable items like dairy or meat and is more closely tied to safety. These labels are not uniformly regulated by the federal government in the U.S., except for infant formula, which has strict date labeling rules.

How Do Expiration Dates Work for Food Safety?

Expiration dates combine scientific testing and manufacturer guidelines to estimate when a product might spoil or lose quality. For instance, a dairy producer might test milk to find the day it starts to sour under typical refrigeration. That date becomes the "Use By" date on the carton.

Here’s a hypothetical example: if a yogurt has a "Use By" date of April 10, and you buy it on April 5, it should be fresh and safe through April 10 if stored properly. However, if you open it on April 12 and it smells sour or shows mold, it’s best to discard it, even if it looks otherwise fine. The date is a helpful guideline, but sensory checks like smell, appearance, and texture are critical safety tools.

Why Do Expiration Dates Matter to You?

Expiration dates help consumers avoid eating spoiled or unsafe foods that could cause foodborne illness. They also assist in managing household food inventories to reduce waste. Knowing these dates helps with meal planning and grocery shopping, ensuring food is consumed while still fresh and safe.

However, treating expiration dates as inflexible rules can lead to unnecessary food waste. For example, shelf-stable foods like canned vegetables often remain safe long after "Best Before" dates if cans are intact and stored properly. Being informed helps balance safety with minimizing discarded food.

What Are the Different Terms Used on Food Labels, and How Are They Confused?

Many people confuse "Sell By," "Use By," "Best Before," and "Expiration Date," though they have different meanings:

• Sell By: A date for retailers indicating how long the product should be displayed for sale. It’s not a safety date.
• Best Before: Indicates peak quality but not safety; food may still be safe to consume after this date.
• Use By: The last date recommended for using the product at peak quality and safety, especially for perishable items.
• Expiration Date: The date after which product safety cannot be guaranteed, commonly used on medicines or infant formula but less consistently on regular food products.

Understanding these differences helps reduce confusion and food waste.

How Important Are Expiration Dates for Different Types of Food?

Expiration date importance varies by food type:

• Highly perishable foods (like dairy, meat, and seafood) require strict attention to expiration dates due to higher risk of spoilage and pathogens.
• Shelf-stable foods (like canned goods, dry pasta, or rice) often remain safe well past expiration if packaging is intact and storage conditions are good.
• Frozen foods can maintain safety past date if continuously frozen but may lose quality.
• Fresh produce usually does not have expiration dates but should be consumed based on appearance and texture.

Always combine expiration date information with sensory checks and proper storage to determine safety.

What Should You Do if You Find Food Past Its Expiration Date?

If food is past its expiration date, consider these steps before discarding:

1. Inspect the food: Look for signs of spoilage such as mold, discoloration, or off odors.
2. Check packaging: If packaging is damaged, bulging, or leaking, discard immediately.
3. Consider storage: Was the food stored according to instructions (e.g., refrigerated, kept dry)?
4. Taste cautiously: For non-risky foods, a small taste test can help determine quality (do not taste if mold or spoilage is visible).
5. When in doubt, throw it out: Safety first if you are uncertain.

These steps help you avoid unnecessary waste while protecting your health.

What Can You Do Next to Use Expiration Dates Wisely?

To make the best use of expiration dates for food safety and reduce waste:

• Organize your pantry and fridge so older items are in front and used first.
• Label leftovers and opened packages with dates to track freshness.
• Understand label terminology to know when food is safe versus when it’s just a quality issue.
• Use sensory checks as a reliable tool alongside dates.
• Learn about proper food storage to extend shelf life and maintain safety.
• Consider apps or tools that help track expiration dates.

These habits can help you make informed decisions about food safety and reduce waste at home.

For more detailed insights on expiration dates and food safety, see articles like Why Expiration Dates Are Important on Food Products, What Expiration Date or Expired Date Means for Food Safety, and Expiration Date Rules for Food Safety and Storage.

Frequently asked questions

Do expiration dates mean food is unsafe after that date?

Not always. Expiration dates often indicate peak quality, not safety. Some foods remain safe after the date, but perishable items should be handled with caution. Always check for spoilage signs and proper storage.

What’s the difference between "Use By" and "Best Before" dates?

"Use By" dates are about safety and should be strictly followed, especially for perishable items. "Best Before" indicates when the product is at its best quality but can still be safe afterward.

Can canned or dry foods be eaten after the expiration date?

Often yes, if the packaging is undamaged and stored properly. Quality may decline, but safety risks are generally low unless the can is bulging or leaking.

How should leftovers be dated and stored?

Label leftovers with the date made and consume within 3-4 days, keeping them refrigerated at or below 40°F. When in doubt, smell and look for spoilage.

What should I do if I’m unsure about food safety after the expiration date?

Use your senses—look, smell, and avoid tasting if you notice mold or bad odors. When uncertain, it’s safest to discard the food.