The Date Stamped on Your Food Was Never About Your Safety

Somewhere in your kitchen right now, there is probably a container of yogurt, a loaf of bread, or a carton of eggs stamped with a date that you have been trained to treat as a deadline. Past that date, most Americans toss it. The date says it is time, so it must be time.

Except the people who put that date there were not thinking about your safety when they did it. They were thinking about something else entirely.

What Those Dates Actually Mean

The labels you see on packaged food in the US fall into a few different categories, and they mean very different things — though the packaging rarely explains which is which.

"Best by" and "best if used by" are the most common. These dates are set by manufacturers to indicate when a product is expected to be at peak quality — meaning flavor, texture, and appearance. They are not expiration dates in any safety-related sense. A box of crackers past its "best by" date might be slightly stale. It is not dangerous.

"Sell by" is a date aimed at retailers, not consumers. It tells stores how long to keep a product on the shelf so that customers have reasonable time to use it after purchase. It has nothing to do with when the food becomes unsafe. Grocery stores pull products at or before this date as a freshness management practice, but eating something a few days past the sell-by date is generally not a health risk.

"Use by" is the closest thing to a genuine safety indicator, and even then it only applies to a narrow category of highly perishable products — things like certain deli meats and infant formula. For most foods, "use by" still refers to quality rather than safety.

The problem is that these distinctions are not printed on the label. You see a date. You assume it means something consistent. It almost never does.

How a Voluntary, Unregulated System Became the Standard

Here is the part most people find genuinely surprising: with the exception of infant formula, the federal government does not require manufacturers to put any date on food packaging at all. The dates you see are largely voluntary, and the criteria for setting them are determined by the manufacturer — not by the FDA, not by the USDA, and not by any standardized national guideline.

This system grew out of a combination of retailer demand and consumer expectation rather than any coordinated food safety policy. Supermarkets in the mid-twentieth century began asking manufacturers to add dates so they could manage inventory rotation. Consumers, seeing dates appear on more and more products, began interpreting them as safety information. Manufacturers, understanding that consumers trust visible date labels, started using them as a tool for communicating freshness — which also happened to drive repurchase when people threw out still-usable food and bought replacements.

The result is a system that looks like regulation, functions like marketing, and gets interpreted as science.

The Scale of the Confusion

The consequences of this misunderstanding are significant. The USDA and the Environmental Protection Agency have both cited date label confusion as a major contributor to food waste in the United States. Estimates suggest that American households discard somewhere between 30 and 40 percent of the food supply — a figure worth hundreds of billions of dollars annually — and studies consistently find that misreading date labels is one of the primary reasons.

A 2019 survey by the Food Marketing Institute found that a majority of American consumers reported throwing food away based on the date on the package, even when the food showed no signs of spoilage. Many of those consumers believed they were making a safety decision. In most cases, they were making a freshness judgment based on a manufacturer's estimate — and throwing away food that was perfectly fine to eat.

What Food Scientists Actually Look At

Food safety researchers and professionals use a different set of signals than printed dates when evaluating whether something is still good. These signals are less convenient to package but considerably more reliable.

Smell is one of the most accurate indicators available. Spoilage bacteria produce compounds that are detectable by the human nose before they reach concentrations that cause illness. If something smells off, that is meaningful information. If it smells fine, a date on the package is not a strong reason to throw it out.

Texture and appearance matter too. Mold is visible. Sliminess is detectable. Color changes in meat and produce often signal bacterial growth. These physical cues, combined with smell, give you more useful information than a number printed weeks ago at a processing facility.

Storage conditions are also a factor the date cannot account for. A carton of milk kept consistently cold will outlast a carton that spent two hours sitting in a warm car. The date was set under assumed storage conditions. Your actual storage conditions may be better or worse.

Why the System Keeps Going

Changing the date label system has been a topic of policy discussion for years. Consumer advocacy groups, food waste researchers, and even some major food companies have pushed for standardized language that would help people distinguish between quality dates and safety dates. Some progress has been made — a handful of large manufacturers have voluntarily shifted toward using "best if used by" more consistently — but the broader system remains fragmented and confusing.

Part of what keeps it in place is that ambiguity serves certain interests. A consumer who throws out food slightly early and buys a replacement is a consumer who buys more product. A retailer who pulls items at the sell-by date maintains a freshness reputation. The confusion is not entirely accidental.

The Takeaway

The date on your food packaging is not a safety deadline handed down by regulators. It is mostly a manufacturer's estimate of peak quality, set without federal standardization and interpreted by most Americans in a way the label was never designed to support. Your senses — smell, sight, texture — are more reliable guides to whether food is still good than a number stamped on a carton. Knowing that will not just save you from unnecessary waste. It might save you a fair amount of money too.