What Expiration Dates on Food Mean for Safety
Short answer
Expiration dates on food indicate the manufacturer’s best estimate of how long a product will remain safe or maintain its best quality. These dates are guidelines, not absolute rules, and understanding them helps you reduce food waste and avoid foodborne illness. Recognizing the differences between date labels lets you make informed decisions about consuming or discarding food.
What Do Expiration Dates on Food Actually Mean?
Expiration dates on food packages are intended to guide consumers about freshness, safety, or quality, but the labels vary in meaning. Some common terms include “Sell By,” “Use By,” “Best Before,” and “Expiration Date,” each serving a different purpose. For example, a “Sell By” date is mainly for store inventory management and does not mean the product is unsafe immediately after that date. A “Best Before” or “Best By” date refers to when the food will be at peak flavor and texture, not necessarily when it becomes dangerous. The “Use By” and “Expiration Date” labels are usually the most important for safety, especially on perishable products. These dates are based on controlled testing and assume proper storage conditions. They are not guarantees that food will spoil immediately after the date but serve as useful guidelines to help consumers avoid eating spoiled food. Understanding these distinctions is the first step to making safer, less wasteful choices at home.
How Do Expiration Dates Work? A Detailed Example
Consider a carton of yogurt with a “Use By” date of July 15. This date is the manufacturer’s estimate of when the yogurt will begin to lose safety or quality. If you open it on July 13 and it smells fresh and has a smooth texture, it is likely safe to eat. If you open it on July 20, the yogurt may have started to spoil and could cause stomach upset. However, if the yogurt was stored improperly—say, left out of the fridge for several hours—its safety could be compromised well before that date. For canned foods, a can of beans might have a “Best By” date two years in the future. If stored in a cool, dry place and unopened, the beans may still be safe several years past that date. However, the quality—flavor, texture—may deteriorate. If a can shows bulges, dents, or leaks, it should be discarded immediately regardless of the date because these signs indicate bacterial contamination risk. Medicines work differently: a bottle of pills with an expiration date means the manufacturer guarantees full potency and safety until that date. Taking medicine after expiration can reduce effectiveness or be unsafe, so it’s best not to use expired medication unless advised by a healthcare professional.
Why Do Expiration Dates Matter for Everyone?
Expiration dates matter because they help protect public health and prevent food waste. Eating expired food, especially perishable items like dairy, meat, or prepared meals, can cause foodborne illnesses. For example, consuming expired chicken or seafood can lead to symptoms from mild nausea to severe gastrointestinal distress. For parents, caregivers, or anyone managing food for others, following expiration dates is a practical step to avoid unpleasant or dangerous outcomes. These dates also encourage consumers to use food before it spoils, minimizing waste and saving money. For example, if you buy a loaf of bread with a “Best By” date in five days, planning to consume it within that timeframe helps avoid throwing away moldy bread. Additionally, knowing expiration dates supports better food storage and rotation habits, which keep your pantry and fridge cleaner and more organized.
What Are the Common Terms People Confuse With Expiration Dates?
Knowing the exact meaning of date labels on food can be confusing because manufacturers and stores use several terms. Here’s a clear breakdown to help you:
| Term | Meaning and Use | What You Should Do |
|---|---|---|
| Sell By | Date for stores to sell the product for inventory purposes | Buy before this date but food may still be good days after |
| Best Before/Best By | Date when product is at peak quality, not safety | Food usually safe after but quality may decline |
| Use By | Last date recommended for safety or quality | Do not consume after this date |
| Expiration Date | Last day product should be used for safety | Avoid consuming after this date |
People often confuse “Sell By” and “Use By,” leading to premature disposal of food still safe to eat. For example, milk with a “Sell By” of March 10 may be good until March 15 if kept refrigerated. Always check the product type and date meaning before tossing food. When in doubt, use your senses: smell, look, and texture to assess food safety.
How Long Do Expiration Dates Last on Canned Foods?
Canned foods have some of the longest shelf lives because they are sealed and sterilized, preventing bacteria growth. A can of vegetables or soup might have a “Best By” or “Use By” date printed, often one to five years later than the purchase date. These dates indicate peak quality, not an absolute safety limit. Many canned goods remain safe for years beyond these dates if stored properly in a cool, dry place and the packaging is intact. For example, a can of tomato sauce with a “Best By” date two years ago might still be safe if there’s no rust, bulging, or leaking. However, the flavor and texture may be compromised. It’s important to never use cans that are dented severely, rusted, leaking, or swollen, as these are signs of bacterial contamination, including botulism risk. If you notice these, safely discard the can without opening it. To keep canned goods safe longer, store them in a pantry with stable temperatures away from humidity or direct sunlight.
How Do Expiration Dates Work on Medicine and Why Is It Different?
Medicine expiration dates ensure that the drug will be effective and safe until that date. Unlike food, taking expired medicine can be risky because the active ingredients degrade and may lose potency or even become harmful. For example, an antibiotic past its expiration date might not work effectively to treat an infection, prolonging illness or fostering resistance. Proper storage is critical: most medicines should be kept in cool, dry places away from light. Heat, humidity, and air exposure accelerate degradation. If you find expired medicine, do not use it; instead, check with a pharmacist about proper disposal. Some communities have medicine take-back programs to safely discard unused or expired drugs. If you need medicines and have expired supplies, consult a healthcare provider for replacements rather than risk taking ineffective or unsafe drugs.
What Should You Do to Use Expiration Dates Effectively?
To make the best use of expiration dates and keep your food safe, follow these practical steps:
- Check Dates When Shopping: Choose products with the furthest-out dates to maximize shelf life at home.
- Organize Your Storage: Use the “first in, first out” system by putting newer items behind older ones so you use the oldest products first.
- Store Food Correctly: Refrigerate perishables promptly, keep pantry items in cool, dry places, and seal opened packages tightly.
- Use Your Senses: Inspect appearance, smell, and texture before consuming food past its date. For example, if milk smells sour or yogurt has mold, discard it.
- Understand Date Labels: Don’t throw “Best Before” foods immediately after the date. Use judgment and sensory checks.
- Discard Unsafe Items: Always throw away food with damaged packaging—swollen cans, torn bags, or broken seals—as these increase risk.
- Educate Household Members: Make sure everyone understands the meaning of date labels to avoid confusion and unnecessary waste.
By following these steps, you can reduce food waste, save money, and keep your family safe.
Frequently asked questions
Can I trust expiration dates on all types of food?
Expiration dates vary by food type and are more critical on perishable items like dairy, meat, or prepared meals. Dry goods and canned foods often last beyond their dates if stored properly. Use sensory checks and packaging condition as additional safety indicators.
What should I do if canned food is past its expiration date but looks fine?
If the can is undamaged—no dents, rust, or swelling—and stored properly, it’s usually safe to eat despite the date. However, the quality may decline. When opening, check the smell and appearance before consuming.
How do I properly dispose of expired medicine?
Do not flush medicine down the toilet unless the label or pharmacist advises. Use community medicine take-back programs or follow FDA guidelines for safe disposal. Consult a pharmacist if unsure.
Are “Sell By” and “Use By” dates interchangeable?
No, “Sell By” dates are for store inventory management; food is often safe after this date. “Use By” dates indicate the last safe day for consumption. Always prioritize “Use By” dates for safety.
What if I accidentally eat expired food?
If the food was only slightly past its date and looks and smells normal, you will likely be fine. Watch for symptoms like nausea or stomach pain. If symptoms develop or if the food was very perishable, contact a healthcare provider.
Can freezing extend the life of food past its expiration date?
Yes, freezing can significantly extend the safe consumption period for many foods by slowing bacterial growth. However, freezing does not improve quality already lost and does not reset expiration dates on packaging.