“Expired food is always unsafe to eat.”

The widespread belief that food becomes instantly unsafe once its printed date passes is a common misconception, largely stemming from the confusing and unregulated history of food labeling. While consumers today expect dates on nearly all products, widespread food dating only became common in the United States in the 1970s, driven by a growing public interest in processed foods and a desire for freshness information. Early "sell by" dates were primarily introduced by retailers for inventory management and to ensure products were at their peak quality for sale, not necessarily to indicate a food safety cliff. There's even a popular, though unconfirmed, anecdote suggesting Al Capone's family influenced early milk dating in the 1930s after someone fell ill, highlighting the early focus on ensuring perceived freshness.

Scientifically, most date labels like "best by" or "best if used by" are indicators of optimal quality, flavor, or texture, determined by manufacturers. They are not federally regulated safety dates, with the sole exception of infant formula, which does have a federally mandated "use by" date related to nutrient potency. Foods can often be perfectly safe to eat well beyond these quality dates if stored properly. "Use by" dates are generally more critical for highly perishable items like deli meats or dairy, as these foods can harbor harmful bacteria that may not be detectable by sight or smell. However, for many other products, a simple visual inspection and sniff test remain reliable methods for determining edibility.

People commonly adhere strictly to these dates due to a lack of understanding about what the various labels truly signify. The inconsistent terminology across food products and the absence of a unified federal standard in the U.S. contribute significantly to consumer confusion, leading many to mistakenly equate "best by" with "unsafe after." This misunderstanding results in an enormous amount of perfectly edible food being discarded prematurely, impacting both household budgets and contributing to significant food waste. Educating consumers on the distinction between quality and safety dates is crucial for reducing this unnecessary waste.