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Avoid Waste in UK Kitchens: Use-By vs Best-Before and the 48-Hour Rule

Posted · 3 Oct 2026

Avoid Waste in UK Kitchens: Use-By vs Best-Before and the 48-Hour Rule

Abstract illustration of food date decisions

Use-by dates are safety limits: stop eating the food after that date. Best-before dates are quality markers: the food is often still fine after that date if you’ve stored it properly. The Food Standards Agency and Gov both draw this line clearly, and it’s the one rule worth remembering above all others.

TL;DR:

  • Use-by dates strictly indicate when perishable foods become unsafe, especially for raw meat, fish, and soft cheeses, and must be followed to prevent food poisoning.
  • Best-before dates relate to quality loss in longer-lasting foods like cereals and canned goods, which can often be consumed safely past the date if stored properly and checked visually.
  • Selling food past its use-by date is illegal in the UK, though shops may sell items beyond the best-before date if they remain fit to eat.
  • Relying on smell or taste alone to judge safety is unreliable because bacteria causing illness often do not change a food’s appearance or odor.
  • Proper storage, including freezing a few days before the use-by date and tracking leftovers, is key to reducing waste while maintaining safety.
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Table of Contents

What use by and best before actually mean

A use-by date tells you when food stops being safe, not just tasty. You’ll find it on perishable things like raw meat, fish and ready-to-eat salads, because these foods can grow harmful bacteria even when they still look and smell fine. A best-before date, on the other hand, is about quality: crisps might go a bit stale, tinned tomatoes might lose some flavour, but the food won’t make you ill once that date passes.

Manufacturers choose which label to apply, and it’s not a casual decision. They carry out risk assessments based on processing and storage, weighing up how the food is made and how quickly bacteria could take hold. That choice also shifts legal responsibility onto them for the safety of the product up to that date.

Both types of date only mean what they say if you store the food correctly. Keep your fridge at 5°C or below, follow any “keep refrigerated” instructions on the pack, and the date is reliable. Leave perishable food out on the counter for a few hours and all bets are off, regardless of what the label says.

  • Use-by applies to perishable foods that can turn dangerous before they look or smell off.
  • Best-before applies to longer-life foods where the main risk is loss of quality, not safety.
  • Correct storage is what makes either date meaningful in the first place.

Which foods usually carry each label

Walk round a typical UK kitchen and you’ll spot the pattern quickly.

  • Use-by: raw meat, poultry, fish, ready-to-eat salads, soft cheeses, and most chilled ready meals.
  • Best-before: tinned goods, dried pasta and rice, cereals, biscuits, and many frozen foods.
  • Milk and eggs sometimes carry either label, depending on how they’ve been processed and packaged.

That last point trips people up. A pasteurised milk carton might say use by because it’s chilled and perishable, while a UHT carton says best before because the processing makes it shelf-stable. Always check the packaging rather than assuming based on the food type alone, since storage instructions can change the picture entirely.

How to act on the dates without wasting food

Here’s the part that actually matters when you’re standing in front of the fridge deciding what to do with tonight’s dinner.

  1. You can eat, cook or freeze a use-by item right up until midnight on the date printed on the pack, as confirmed by GOV.UK’s labelling guidance.
  2. Once that date has passed, don’t eat it, cook it or freeze it: the safety window has closed.
  3. If you cook the food on or before the use-by date, eat it within 48 hours or freeze it straight away.
  4. When you freeze cooked food, label it with the new date so you know exactly how long it’s been in there.
  5. For best-before items, trust your senses: look, smell and taste before deciding whether to use something past its date.

Pro Tip: Write the freezing date on masking tape rather than relying on memory. A “frozen on” label saves you from playing freezer roulette three months later.

The 48-hour rule is the one most households forget. Cooking food on the use-by date doesn’t reset the clock to zero; it just gives you a short, fixed window to eat it before the risk climbs again.

Illustrated timeline for cooked food window

What the law says about selling and labelling food

Retailers don’t get to play fast and loose with these dates either. It’s a criminal offence in the UK to sell or display food for sale after its use-by date, full stop. Best-before items are a different story: shops can legally sell them past the date as long as the food remains fit to eat and of reasonable quality, though at that point the retailer is taking on the responsibility for its condition.

  • Selling food past its use-by date is illegal, regardless of how it looks or smells.
  • Best-before items can still be sold after the date if they’re genuinely fit for consumption.
  • Packaging must show the date clearly, usually as a day and month, with longer-life products sometimes shown as month and year.

This is worth knowing next time you spot a reduced shelf near closing time. Those yellow-stickered tins and packets past their best-before date are perfectly legal and often a decent bargain.

Why the sniff test doesn’t always work

Here’s the uncomfortable truth: the bacteria that cause food poisoning often don’t change how food smells, looks or tastes. That’s exactly why the NHS warns against relying on your senses for anything carrying a use-by date. Food can smell completely normal and still make you seriously ill.

Sensory checks do have their place, just not here. For best-before foods, a good look, sniff and taste test is a sensible way to judge whether something’s still worth eating. Watch for mould, an odd texture or a sour smell. Eggs sit in a slightly different category: if you’re eating them a couple of days past their best-before date, cook them thoroughly rather than serving them soft or raw.

Why the sniff test doesn't always work — overview diagram

Extra care for people at higher risk

Pregnant women, older people, young children and anyone with a weakened immune system face a much higher risk from foodborne illnesses like listeria. For these households, strict adherence to use-by dates isn’t optional caution, it’s the baseline. Skip the “it’s probably fine” guesswork entirely.

Simple habits help: store ready-to-eat foods separately from raw meat, label leftovers clearly with the date they were cooked, and adopt a firm discard policy once anything reaches its use-by date. These small routines matter more in households where someone is more vulnerable.

Cutting food waste without cutting corners on safety

Most food waste happens for one simple reason: people lose track of what’s in the fridge until it’s too late. A few habits fix that without any risk to safety.

  • Freeze perishable items a day or two before their use-by date rather than waiting until the last moment.
  • Use FIFO: first in, first out. Put newer shopping behind older stock so nothing gets forgotten at the back.
  • Plan a couple of meals each week specifically around whatever’s closest to its date.
  • Batch-cook and freeze portions when you’ve got several items nearing their use-by date at once.

Pro Tip: Keep a running list of what’s in your freezer, even a scrap of paper on the door. It stops good food turning into a mystery parcel six months later.

This is exactly the gap such meal-planning apps aim to close. By scanning barcodes or adding items manually, these apps track what’s already in your fridge, freezer and cupboards, and they prioritise suggestions for whatever needs eating first. For more ideas on using up stock before it turns, their guide on using food up before it goes off and their tips on freezer-first shopping are worth a look.

A practical consumer’s take on date labels

I’ve thrown out more yoghurt than I’d like to admit, usually because it sat at the back of the fridge rather than because it was actually unsafe. The fix wasn’t willpower, it was simply seeing what I had before shopping again. Treat use-by dates as a hard stop and best-before dates as a nudge to check, and you’ll waste far less without taking any real risk.

— Donkey

Where to find the official guidance

  • Gov sets out the legal definitions and the 48-hour cooking rule.
  • The Food Standards Agency explains manufacturer responsibility and storage advice in more depth.
  • NHS guidance on food poisoning covers symptoms, causes and why sensory checks can’t be trusted for use-by foods.

FAQ

How strict are use-by dates in the UK?

Use-by dates are strict: the food is not considered safe to eat, cook or freeze once the date has passed, according to GOV.UK. There’s no grace period, so treat the date as a firm cut-off rather than a rough guide.

Is it okay to eat food one day after the use-by date?

No. Once the use-by date has passed, GOV.UK advises against eating, cooking or freezing the food, even by a single day, because the safety risk doesn’t follow a visible or predictable pattern.

Is it illegal to sell food after its use-by date?

Yes, selling or displaying food for sale after its use-by date is a criminal offence in the UK. Best-before items can still legally be sold past their date as long as the food remains fit for consumption.

Is there a difference between a best-before date and an expiry date?

“Expiry date” isn’t an official UK labelling term, but people often use it loosely to mean use-by date. A best-before date is different: it’s about quality, not safety, so food can often still be eaten after that date if it’s been stored correctly.

Sources

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