Few pieces of everyday information are as widely misread as the date printed on a food package. Most people treat it as a safety deadline after which the contents become hazardous, discarding food the moment the date passes. Surveys examining household waste consistently find date confusion among the largest single contributors to edible food being thrown away.
The reality is that most date labels are not safety deadlines at all. They are manufacturer estimates of peak quality, set through a process that is considerably less regulated than most shoppers assume, using different phrases that mean genuinely different things. Understanding who sets these dates, what each phrase actually indicates, and where the real safety boundaries lie clarifies both what the label is telling you and what it is not.
Who Actually Sets the Date
A widespread assumption holds that food dates are determined by government food safety authorities, applying standardised testing to establish when a product becomes unsafe. In most jurisdictions and for most product categories, this is simply not the case. The manufacturer sets the date themselves.
Manufacturers determine dates through internal testing, generally involving storing samples under controlled conditions and assessing at intervals how quality attributes such as texture, flavour, colour, and aroma change over time, then selecting a date by which the product still meets their own quality standards.
Because the standard being applied is the manufacturer's own quality threshold rather than any externally defined safety limit, there is genuine variation between companies producing broadly similar products, and a manufacturer has commercial incentives that do not necessarily push toward the longest defensible date.
What Best Before Actually Means
A best before date, sometimes phrased as best if used by, is explicitly a quality indicator rather than a safety one. It represents the manufacturer's assessment of how long the product will retain its intended flavour, texture, and appearance under proper storage conditions.
Food past its best before date is generally still safe to eat, assuming it has been stored correctly and the packaging remains intact. What changes is quality rather than safety, meaning biscuits may soften, cereals may lose crispness, and flavours may fade, none of which constitutes a hazard.
This is precisely where the largest share of unnecessary waste occurs, since consumers routinely discard perfectly edible products at the best before date under the entirely reasonable but mistaken belief that the label is communicating a safety boundary.
What Use By Genuinely Indicates
A use by date carries meaningfully different weight. It appears on products where microbial growth presents a genuine safety risk that is not readily detectable by smell or appearance, and it does function as a safety-related deadline rather than a quality estimate.
This label typically appears on highly perishable items including fresh meat, poultry, fish, and certain ready-to-eat products, categories where pathogens can multiply to hazardous levels while the food still looks and smells entirely normal.
The critical distinction is that these products can be dangerous without any sensory warning, which is exactly why a date-based rule exists for them. Relying on smell and appearance works reasonably well for spoilage organisms but poorly for the pathogens that cause genuine illness.
Why Sell By Dates Confuse Everyone
Sell by dates are directed at retailers rather than consumers, indicating how long a product should remain on display to allow reasonable remaining shelf life at home after purchase. They are inventory management instructions that were never intended as consumer guidance.
Because these dates appear on packaging that consumers read, they are routinely interpreted as consumption deadlines, causing people to discard products that were specifically dated to still have useful life remaining after the retailer removed them from shelves.
Several jurisdictions have moved to remove or restrict sell by dates on consumer packaging precisely because of this confusion, on the reasoning that a date intended for internal retail logistics should not be printed where shoppers will misread it as a safety instruction.
How Shelf Life Testing Actually Works
Establishing a date typically involves storing product samples under conditions replicating expected distribution and household storage, then testing at intervals for microbiological, chemical, and sensory changes to identify when the product stops meeting specification.
Sensory panels play a substantial role, with trained assessors evaluating samples for changes in taste, smell, texture, and appearance, since many quality failures are perceptual rather than measurable by instrument and consumer acceptance is ultimately what the date is protecting.
Accelerated testing is frequently used to shorten development timelines, storing samples at elevated temperatures to speed degradation and then extrapolating to normal storage conditions, an approach that saves considerable time but which introduces genuine uncertainty since not all degradation processes accelerate proportionally.
Why Storage Conditions Matter More Than the Date
Every printed date assumes the product has been stored as directed throughout its journey from factory to kitchen, which means the date is only meaningful if that assumption actually held, and in practice it frequently does not.
A chilled product left at room temperature for an extended period during transport or shopping may be unsafe well before its printed date, because the microbial growth the date was calculated to prevent has already occurred faster than the model assumed.
Conversely, a product stored consistently colder than required, or frozen before its date, can remain safe and acceptable far beyond the printed date, since the processes the date was estimating have been slowed or effectively halted entirely.
What Actually Makes Food Unsafe
Food safety risk comes primarily from pathogenic microorganisms multiplying to levels capable of causing illness, a process governed by temperature, moisture, acidity, and time rather than by any date printed on packaging.
Crucially, the organisms causing illness are frequently different from those causing visible spoilage. Spoilage organisms produce off smells, slime, and visible mould, giving clear sensory warning, while many pathogens produce no detectable change whatsoever at hazardous concentrations.
This is the core reason sensory judgement alone is insufficient for high-risk foods. The absence of any off smell genuinely does not establish that a food is safe, which is precisely the gap that use by dates exist to cover.
Which Foods Barely Expire at All
Certain foods have such low moisture content or such unfavourable chemistry for microbial growth that they remain safe essentially indefinitely, including dried rice, pasta, sugar, salt, and honey, all of which may carry dates that bear little relation to actual safety.
Honey is a frequently cited example, combining low moisture, high sugar concentration, and natural acidity in a way that makes microbial growth effectively impossible, which is why archaeological finds of honey have been reported as remaining unspoiled after extremely long periods.
Dates on these products generally reflect quality changes such as crystallisation, staling, or gradual flavour loss rather than any safety consideration, and in some cases exist primarily because retail and regulatory conventions expect a date to be present.
How Canning and Preservation Change the Picture
Commercially canned foods undergo heat treatment specifically designed to destroy microorganisms and are then sealed against recontamination, producing a product that remains safe for very extended periods provided the seal stays intact.
Quality does continue declining in canned goods, with texture softening and flavour gradually degrading, and highly acidic contents can slowly react with the container over time, but these are quality rather than safety considerations under normal circumstances.
The genuine safety concern with canned food is not the date but physical damage to the container, since a compromised seal permits recontamination, which is why bulging, severe denting near seams, or leakage are treated as far more meaningful warning signs than an elapsed date.
How Freezing Interacts With Dates
Freezing at sufficiently low temperature effectively halts microbial growth, meaning food frozen before its date does not continue moving toward expiry while frozen, and the remaining shelf life resumes rather than continues once it is thawed.
What freezing does not halt is quality degradation, since moisture migration produces freezer burn, textures change as ice crystals damage cell structures, and fats can gradually oxidise, all of which affect eating quality without creating a safety hazard.
This is why freezer storage guidance is expressed in terms of quality rather than safety, indicating how long food will remain pleasant to eat rather than how long it remains safe, which for properly frozen food is a considerably longer period.
Why Date Confusion Wastes So Much Food
Studies examining household food waste consistently identify date label misunderstanding as a major contributor, with substantial quantities of edible food discarded specifically because a best before date had passed on a product that remained entirely fit to eat.
The waste extends well beyond households into retail and food service, where operational policies frequently mandate discarding stock at dates that reflect quality rather than safety, producing large volumes of avoidable waste in the name of caution.
The economic and environmental scale of this is substantial, since discarded food represents wasted water, land, energy, and transport in addition to the food itself, which is why date labelling reform has become a genuine policy focus in a number of jurisdictions.
How Regulations Differ Between Countries
Date labelling requirements vary considerably between jurisdictions, with some mandating specific phrases and defining their meanings in regulation, while others leave terminology substantially to manufacturer discretion, producing genuine inconsistency in what a shopper encounters.
Some regulatory systems require date labels on nearly all packaged foods, while others exempt categories where dates carry little meaning, an approach intended specifically to avoid printing dates on products where they would mislead rather than inform.
This variation means guidance valid in one country may be misleading in another, and it also means internationally traded products can carry labelling that does not match local conventions, adding further confusion for consumers attempting to interpret them correctly.
What Reform Efforts Are Attempting
Reform proposals generally focus on reducing the number of distinct phrases in circulation, on the reasoning that the proliferation of similar-sounding terms with genuinely different meanings is itself the primary source of confusion.
A common recommendation is standardising on two clear phrases, one explicitly signalling quality and one explicitly signalling safety, so that consumers face a genuine binary distinction rather than attempting to interpret a range of overlapping formulations.
Some proposals additionally recommend removing dates entirely from products where they convey no meaningful information, on the basis that a date printed on salt or dried pasta actively misleads by implying a limit that does not genuinely exist.
How to Judge Food Without Relying on the Date
For products carrying best before dates, sensory assessment is genuinely appropriate. Visible mould, off odours, unusual texture, or fermentation where none is expected are all meaningful indicators, and their absence in a low-risk product is reasonable evidence it remains acceptable.
For products carrying use by dates, sensory assessment is specifically not sufficient, because the relevant hazard produces no reliable sensory signal, which is why the date genuinely should be treated as a deadline for these categories.
Packaging integrity matters across all categories, since damaged seals, swelling, or leakage indicate potential contamination regardless of what the date says, and these physical signs generally carry more meaning than the elapsed time since a printed date.
Why Manufacturers Set Dates Conservatively
Manufacturers face genuinely asymmetric consequences when setting dates. A date that is too long risks consumers encountering a degraded product, generating complaints and reputational damage, while a date that is too short simply means the product is discarded slightly earlier than necessary.
This asymmetry pushes systematically toward conservative dating, since the commercial downside of a disappointing product experience is considerably more visible to a manufacturer than the diffuse societal cost of food being discarded while still perfectly good.
Understanding this incentive structure explains why printed dates frequently sit well inside the genuine limit of a product's usable life, and why treating them as precise thresholds rather than cautious estimates leads to substantial and entirely avoidable waste.
Why Opened Packaging Changes Everything
Every printed date assumes the packaging remains sealed, because the date was calculated for a product protected from oxygen, moisture, and airborne contamination by that seal. Once a package is opened, the conditions the date was based on no longer apply and the original figure becomes substantially less meaningful.
This is why many products carry secondary instructions such as consume within a specified number of days after opening, guidance that frequently overrides the printed date entirely and which is genuinely the more relevant number once a seal has been broken and the contents exposed to the surrounding environment.
Consumers routinely overlook this secondary guidance while treating the primary printed date as authoritative, which produces the genuinely hazardous situation of relying on a distant printed date for a product that was opened weeks earlier and has been degrading under entirely different conditions ever since.
How Home Storage Habits Undermine the Assumptions
The temperature at which a domestic refrigerator actually operates varies considerably between households and even between shelves within the same appliance, and surveys measuring real domestic refrigerators have repeatedly found a substantial proportion running warmer than the temperature manufacturers assume when calculating shelf life.
Door shelves are consistently the warmest location in a refrigerator because they are exposed to ambient air every time the door opens, which makes them a genuinely poor choice for the highly perishable items frequently stored there, including milk and eggs in many households.
These practical realities mean the printed date represents a best case that assumes storage conditions many kitchens do not actually achieve, which argues for treating dates on high-risk products as an outer limit rather than a target to be approached confidently.
What Redistribution Organisations Do With Dated Food
Food redistribution organisations have developed considerable practical expertise in exactly this area, routinely accepting and distributing food that has passed its best before date while applying strict rules excluding anything past a use by date, a distinction they apply precisely because it reflects the genuine difference in risk.
This operational practice, sustained across very large volumes of food over many years, provides meaningful real-world evidence supporting the quality-versus-safety distinction, since these organisations operate under genuine liability and would not maintain such policies without confidence in the underlying reasoning.
Several jurisdictions have introduced legal protections specifically to enable this redistribution, addressing the concern among businesses that donating food approaching or past a quality date might expose them to liability, a barrier that had previously caused substantial quantities of edible food to be discarded rather than donated.
The single most useful thing to understand about the dates printed on food packaging is that the substantial majority of them are not safety information at all. Best before dates are simply manufacturer estimates of peak quality, arrived at through internal testing against the company's own commercial standards rather than against any externally defined safety threshold, and food past them is generally still perfectly safe to eat provided it has been stored properly throughout and the packaging remains fully intact. The genuine exception is the use by date, which appears on products where pathogens can reach hazardous levels without producing any smell, appearance, or texture change that would warn you. For those categories the date is genuinely doing real work, and it is doing that work precisely because your own senses cannot be relied upon to do it for you. Everything else, including the sell by date that was quite genuinely never meant for shoppers to read at all, amounts to quality guidance that is being very widely misread as though it were a safety deadline, at a cost measured in enormous quantities of perfectly edible food thrown away every single year for no reason beyond a misunderstanding about what the label was ever meant to communicate in the first place.
Sources
- Wikipedia β overview of shelf life determination and date labelling
- Food and Agriculture Organization β international guidance on food loss, waste, and labelling
- U.S. Food and Drug Administration β regulatory information on food dating and safety
- World Health Organization β food safety guidance on pathogens and storage
- U.S. Department of Agriculture β guidance on food product dating and storage practices
FAQ
Is food unsafe after its best before date?
Generally no β best before is a quality estimate set by the manufacturer, not a safety deadline. Properly stored food with intact packaging is usually still safe well past it.
What is the difference between use by and best before?
Use by is a genuine safety deadline for products where pathogens can reach dangerous levels without any smell or appearance change. Best before only indicates peak quality.
Who decides what date goes on food packaging?
In most jurisdictions the manufacturer does, based on their own internal shelf life testing against their own quality standards rather than a government-set safety limit.
What is a sell by date for?
It is an instruction to retailers about how long to display a product, not consumer guidance β which is why it causes so much confusion when shoppers read it as a deadline.
Can you rely on smell to tell if food is safe?
Only for low-risk foods. Spoilage organisms produce obvious warning signs, but many dangerous pathogens produce no detectable change at all, which is why use by dates exist.
About the Author
We reference Wikipedia, Food and Agriculture Organization, U.S. Food and Drug Administration, World Health Organization, and U.S. Department of Agriculture to explain the background and current understanding of this topic.
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