It’s not just milk! The surprising five foods you CAN safely eat past their use by date – after M&S scrapped its milk markings
- Eggs, yoghurt and bread can all last weeks longer than their use by dates
- To prolong the lifespan of chocolate keep it out of the fridge and in the cupboard
- READ MORE: M&S bins ‘use-by’ dates on milk – in favour of the sniff test
You might have heard milk is safe to drink after its use by date.
But are you aware that the same logic applies to eggs, yoghurt and even bread, too?
Best before — rather than use-by dates — already appear on a range of products, like frozen, dried and tinned food.
The Food Standards Agency encourages people to use ‘sensory cues’ to determine if such food are fine to eat. This includes the old-fashioned ‘sniff test’, which M&S now says customers should use for its milk after it ditched use-by labels.
However, this approach does not apply to items with a use-by date, as even if it looks and smells fine, it can contain bugs that cause food poisoning.
But which other foods can you safely eat after their use by date?
M&S isn’t the first retailer to change its milk labelling. Morrisons first introduced the label change in January 2022. But other leading retailers, such as Tesco, Asda and Sainsbury’s are yet to follow suit
Eggs
More than 700million eggs, costing £139million, are thrown away every year due to over-reliance on ‘best before’ dates.
The Food Standards Agency advises eggs are safe to eat for ‘a couple of days after’ the best before date ‘if they are cooked well’.
Another simple way to assess their age is to place them into a bowl of water.
Fresh eggs sink to the bottom, while bad ones float to the top.
If the egg rests on the bottom and tilts upwards, it’s a sign it’s going off and should be eaten as soon as possible.
The older an egg is, the longer air has been entering the shell and making it buoyant.
How to tell if a ‘best before’ product is OK to eat
For foods with a best before date (which concerns food quality), you may choose to use sensory cues to find out if the food is OK to eat.
For example, you could look for visible mould on bread, taste to see if biscuits/crisps are stale, or sniff/smell some dairy products with a best before date to see if they have soured.
For food with a use-by date, the ‘sniff test’ is not an appropriate method for testing if food is safe to eat.
Food can look and smell fine even after the use by date has passed, but the product will not be safe to eat. We can’t see or smell the bugs that can cause food poisoning.
Manufacturers are responsible for deciding whether to apply a use-by date or a best before date on their products.
This will depend on factors such as how the food is made and how risky it is. They will make sure the right label is used on the product.
Source: Food Standards Agency
Bread
The best before date on bread is based on the assumption that you’ll leave it out on the kitchen counter.
If left out, exposed to higher temperatures, mould is more likely to form quickly, within a few days.
But storing your loaf in the fridge can extend its shelf life for up to two weeks, according to the US Department of Agriculture.
It may taste a little harder because as bread starts to cool, water leaves the starch and moves into other parts of the mixture.
This allows starch molecules to return to their crystallized state. It happens even in humid conditions but the fridge can speed up the process.
To extend its shelf life further, toss it in the freezer. This will keep the bread good for consumption for at least three months.
Yoghurt
Yoghurt made under sterile conditions and still in an unopened tub in the fridge should generally still be safe after a fortnight.
But once opened, other micro-organisms such as listeria can quickly colonise it, putting you at risk of food poisoning.
Normally Greek yoghurt must be consumed within seven days once opened.
In April the Co-op followed in the footsteps of Sainsbury’s and Asda by announcing it was removing use-by dates from its own-brand yoghurt in an attempt to address the problem of millions of pots that are still safe to eat being wasted each year.
The supermarket encouraged shoppers instead to ‘use their judgement’, with best before dates replacing use by dates.
At the time, head of food safety at the Co-op Nick Cornwell said: ‘Yoghurt can be safe to eat if stored unopened in a fridge after the date mark shown, so we have made the move to best-before dates to help reduce food waste.
‘The acidity of yoghurt acts as a natural defence. We’d encourage shoppers to use their judgment on the quality of their yoghurt if it is past the best-before date,’ he added.
The Food Standards Agency advises eggs are safe to eat for ‘a couple of days after’ the best before date ‘if they are cooked well’. Another simple way to assess their age is to place them into a bowl of water
In the same month, Tesco also confirmed it would scrap use by dates on 30 of its own-brand dairy products including Greek Style Yogurt, Creamfields Greek Style Yogurt and Creamfields Berry Medley Low Fat Yogurt.
Chocolate
The little water content in chocolate helps it stay fresh beyond its best before date.
But it can often develop a white coating, known as the ‘bloom’, when it’s exposed to the air.
This happens when some of the crystalline fat melts and rises to the top. It’s not mould and it’s fine to eat.
If you want to keep your chocolate fresh for as long as possible, it’s important to store it correctly.
Keeping it at a consistent temperature in a cupboard or pantry away from direct sunlight and properly wrapped in foil will help keep your chocolate tasting great past its best before.
But contrary to popular belief, the fridge isn’t actually the best place for your chocolate.
The extreme temperature changes can cause the sugar and fat blooms.
Biscuits
Like crisps, biscuits are also highly processed and thus can be consumed long after their sell-by date – especially if let unopened.
If they taste soft or soggy simply pop them in the oven to get them crunchy again.
To restore crispness, place them on a paper towel on top of a plate and microwave them for 40 seconds.
This helps evaporate the moisture that’s made them go a little soggy – allow them to cool before you eat.
According to the charity Waste & Resources Action Programme (Wrap), unopened biscuits and cereal can be eaten weeks after the best before date.
So would YOU trust the sniff test? As supermarkets start scrapping use-by dates and advise shoppers to ‘use their noses’, SARAH RAINEY puts the old-fashioned method on trial
How much food have you thrown away this week? Go on, be honest.
A study by Tesco found that the average British family wastes £800 worth of food a year, with half a million people binning perfectly edible produce on a daily basis.
Potatoes are the most wasted food in this country, closely followed by bread and milk.
But what if we could change this, by returning to the old-fashioned way of working out whether food has gone bad: the sniff test?
Today, M&S revealed it would swap use-by dates for best before dates on its own-brand milk. Morrisons did the same thing last January and last June the Co-op scrapped use-by dates on its yoghurts.
The retailers are asking shoppers to use their noses to tell whether food is good to eat — a move they say could save more than £370million in wasted dairy.
A century ago, this was how everyone did it; expiration dates didn’t appear until the 1930s. Dr Laura Brown, senior lecturer in nutrition, food and health sciences at Teesside University, says the sniff test can still work today — but advises caution.
The difference, she explains, is between use-by dates — which concern food safety — and best-before dates, about quality. ‘For foods with a best-before date, you can use sight, taste or smell to see if the products have gone off,’ she says. However, when it comes to use-by dates: ‘We cannot always smell the bugs that can cause food poisoning.’
Here, SARAH RAINEY investigates how long it takes our favourite foods to fail the sniff test after their expiry date.
Sarah Rainey tries out the ‘sniff test’ on a number of popular foods and drinks and documents how long they last until they have gone off
THE EXPERIMENT
I stocked up on everyday essentials, including dairy, meat, fruit and veg. I bought two of each item, both with identical use-by or best-before dates, and unless directed otherwise stored them in the fridge. The day after its expiration date passed, I opened one of each item and sniffed it. My husband, neighbour and (brutally honest) toddler acted as ‘independent sniffers’, to make the test objective.
I repeated the test daily, carefully re-sealing each item in cling film.
When the smell turned bad, I opened the second item, to check if it had lasted longer if the packaging had remained sealed. In every case, by the time the open item had gone off, the sealed one had turned just as bad, too. Here are the rest of the eye-opening results . . .
VANILLA YOGHURT
STORED: In the fridge.
SAFE TO SNIFF? Yes — I’ve selected a Co-op yoghurt, the very product on which use-by dates will be scrapped.
DAY 1 AFTER USE-BY DATE: Looks and smells delicious. ‘Yoghurt usually lasts for at least a few days after its expiration date and up to a week after opening the container if it is sealed tightly,’ says Dr Brown.
DAY 7: There’s a thin, watery layer on top but the yoghurt underneath — I brave a small spoonful — smells of vanilla and tastes creamy.
DAY 9: The sweet smell is fading. I think it’s on the turn but it tastes fine, if a little less sweet.
DAY 10: There’s a tangy, sour smell the moment I lift the lid and the yoghurt looks curdled. ‘Yoghurt should smell fresh and pleasant,’ says Dr Brown. ‘If you detect a smell like sour cream, discard it.’
LASTED: 9 DAYS
BEEF MINCE
STORED: In the fridge.
SAFE TO SNIFF? Yes, says Dr Brown, but with great care. ‘Beef that has gone bad will develop a slimy or sticky texture and will have off or foul odours. Ground beef should be used within one to two days of purchase.’
DAY 1: The mince looks pink and smells normal.
DAY 2: It’s turning greyish-brown but smells fine. Dr Brown says: ‘Beef can sometimes develop a brown colour owing to metmyoglobin, a chemical reaction that occurs when the myoglobin in meat is exposed to oxygen. As long as the change in colour isn’t accompanied by other signs of spoilage, it should be fine.’
DAY 3: There’s a strange, sweet smell and the brown colour is spreading. I wouldn’t want to handle this, let alone eat it — it’s gone off.
LASTED: 2 DAYS
GRANARY LOAF
Granary loaf: Bread is one of the most commonly wasted items, but are known to go mouldy after a few days
SAFE TO SNIFF? Yes. Bread has a best-before — not a use-by — date, so there are no immediate safety issues. I store it in the bread bin. ‘Putting sealed bread in the fridge will make it go stale quicker,’ says Dr Brown.
DAY 1: The bread is as fresh as the day I bought it.
DAY 3: No change. It smells fine and is perfectly good for sandwiches.
DAY 5: The bread still smells sweet and nutty, but the ends are going stale. It has lost its freshness but works well as toast.
DAY 6: The whole loaf is drying out and I spot a few spots of green mould — time to bin it. Dr Brown says she would expect bread to last five to seven days beyond its best-before date. ‘If your bread develops a little blue mould, remove it along with a few centimetres around the mould,’ she adds. ‘Dispose of any that’s developed black mould.’
LASTED: 5 DAYS
TENDERSTEM BROCCOLI
SAFE TO SNIFF? Yes. ‘Broccoli cut into florets — like this one — releases sulforaphane, a compound found in cruciferous vegetables that can give a strong odour,’ says Dr Brown. ‘Any odours that smell especially strong are a sign that the broccoli may be past its best.’
DAY 1: The tenderstem smells fresh and looks bright green.
DAY 3: The stalks are starting to dry out and the colour is fading but it still smells normal. I stir-fry a few stems and they taste delicious.
DAY 5: The remaining broccoli is softening. ‘The stem should be firm as a soft stem is an indicator of spoilage,’ says Dr Brown. You can cut away the ‘bad’ part and use the rest.
DAY 7: The broccoli has almost completely lost its fresh, earthy smell, and the stems look withered and faded. There are some yellowy-brown spots on one floret; a sure sign, says Dr Brown, that it is starting to spoil. While I could technically still cook it, the change in colour tells me it would taste sour and bitter, and the yellow hue is the precursor to white mould, which could cause food poisoning.
LASTED: 6 DAYS
CHICKEN BREASTS
Chicken Breasts: Raw chicken that is past its sell-by date can be a health hazard as not all harmful bacteria will give off a smell
SAFE TO SNIFF? No. ‘Raw chicken can harbour bacteria such as salmonella and campylobacter, which is generally odourless and cannot be seen,’ warns Dr Brown. ‘So there is no way to tell by looking or sniffing that it may be off.’
DAY 1: With no intention of eating the chicken after its use-by date, I’m curious to see what happens to the food once it is out of date. The answer? Not much. The chicken breasts look normal and smell, well, like raw chicken.
DAY 2: Already, there’s a sticky, slimy film developing on the meat and, although the smell hasn’t changed, I don’t want to keep it in my fridge any longer.
LASTED: 0 DAYS
EGGS
Eggs: You are likely to smell very quickly when an egg has gone rotten, but it can take some time
SAFE TO SNIFF? Yes. These have both a ‘display-until’ date — after which they can still be eaten but no longer sold — and a ‘best-before’ date.
‘The Food Standards Agency says eggs can be safely eaten up to two days past the date shown, as long as they are cooked to the point where the yolk and white are solid,’ says Dr Brown. ‘But this is a cautious estimate. The sniff test will soon determine whether an egg has gone off.’
If you don’t want to crack the egg, you can put it into a bowl of water. If it sinks, it’s fresh; if it floats, it’s full of air and probably off.
Eggs can stay fresh for months at room temperature, but I stored mine in the fridge to keep them at a consistent temperature.
DAY 1: I decide to crack open an egg a day to test its freshness.
‘Eggs that have gone off will give off an unmistakable smell, raw or cooked,’ Dr Brown says. There’s no aroma at all.
DAY 5: Still no distinctive smell and both parts of the egg look healthy.
DAY 12: I’m now on to my second box of a dozen eggs — that’s a lot of omelettes. They still look, taste and, crucially, smell fine.
DAY 19: This is getting repetitive . . . will they ever go off?
DAY 23: Finally, there’s a pongy, sulphurous smell from the egg. I try another and it’s the same — they’ve turned.
LASTED: 22 DAYS
POTATOES
SAFE TO SNIFF: Yes. ‘Potatoes can be perfectly edible three weeks after their best-before date,’ says Dr Brown. I stored them in a cool, dark cupboard, not the fridge, because the cold can increase their sugar levels, which leads to higher levels of a harmful chemical called acrylamide when cooked.
DAY 1: There’s a strong, earthy smell coming from the bag of potatoes and they look healthy.
DAY 5: No change.
DAY 10: White and purple sprouts have started appearing, but if I remove them, the spuds are fine to eat, says Dr Brown. ‘You can also cut away any mouldy parts and consume the potato as long as it’s still firm and a normal colour.’
DAY 15: More sprouts, some with black tips, but I cut away the bad bits and boil some for dinner: they taste fine.
DAY 20: The potatoes are soft to the touch, with dark spots on their skins, and there’s an unpleasant, rotting smell. Time to get rid of them.
LASTED: 19 DAYS
COD FILLETS
Cod fillets: Many eat fish raw regularly, but old or rotten fish will put you off for a while
SAFE TO SNIFF? No. As cod comes from cold water, lots of microbes can grow in the fridge environment, leading to food poisoning. You can’t detect these by smelling the fish.
However, Dr Brown says: ‘Raw fish will develop a shiny, milky colour when it is going off and should be disposed of.’
DAY 1: There is already a very pungent, fishy smell coming from the cod.
DAY 2: There’s a slimy layer on the surface of the fish and the smell is becoming too much to bear. The packet goes straight in the bin.
LASTED: 0 DAYS
WHOLE MILK
Whole milk: Likely the most common item to receive the sniff test
SAFE TO SNIFF? No. As cod comes from cold water, lots of microbes can grow in the fridge environment, leading to food poisoning. You can’t detect these by smelling the fish.
However, Dr Brown says: ‘Raw fish will develop a shiny, milky colour when it is going off and should be disposed of.’
DAY 1: There is already a very pungent, fishy smell coming from the cod.
DAY 2: There’s a slimy layer on the surface of the fish and the smell is becoming too much to bear. The packet goes straight in the bin.
LASTED: 0 DAYS
WHOLE MILK
SAFE TO SNIFF? Yes — this was the first product singled out to have use-by dates removed. ‘Because all milk in supermarkets has to be pasteurised — that is, have 99.9 per cent of its bacteria removed — milk that has gone off does not pose an immediate risk to health,’ says Dr Brown.
DAY 1: The milk smells and tastes fresh.
DAY 2: There’s a slightly citrussy smell coming from the milk, but I taste it and it’s still fine.
DAY 3: The smell is much stronger and tangier, and when I pour the milk into my tea it floats to the surface in chunks.
LASTED: 2 DAYS
HUMMUS
Hummus: A popular item often kept in the fridge and dipped back into when needed
SAFE TO SNIFF? Yes. ‘Hummus that has gone off has a distinct sour smell,’ says Dr Brown.
DAY 1: Creamy, smooth and with its usual mouthwatering whiff of garlic and chickpeas, the hummus is perfectly fine to eat.
DAY 3: The smell is still appetising. No change in texture or taste.
DAY 6: It is starting to look a bit bubbly on top but the smell hasn’t altered. ‘Hummus that has gone off changes to a darker colour and gets a yellowish layer on the surface,’ says Dr Brown.
DAY 9: The yellowish layer is much more apparent now and there’s a strong, sour smell of lemon coming from the pot.
‘The hummus is ready to be disposed of,’ Dr Brown says.
LASTED: 8 DAYS
CAMEMBERT CHEESE
Camembert Cheese: Another popular dairy product which will let you know when it’s time to put it in the bin
SAFE TO SNIFF? Yes but because there’s such a strong smell to begin with, it can be tricky to tell when the cheese has gone off.
‘Properly-stored Camembert cheese can last one to two weeks in the fridge,’ says Dr Brown. ‘When it has gone off, it will smell terrible.’
DAY 1: I’m not one for pongy cheeses, so this is tough: the Camembert looks normal and smells, well, like reeky cheese.
DAY 5: The smell has not changed at all — and it is still soft and creamy inside.
DAY 10: It’s getting smellier, but my husband insists it’s not too bad yet. He tries a wedge and declares it delicious.
DAY 14: The stench is now awful, and I spot green spores of mould growing on it. ‘With hard cheeses, you can cut away any visible mould,’ says Dr Brown. ‘With the softer cheeses, you cannot eat them if there is any mould, as this can grow alongside nasty bacteria such as listeria and E.coli.’
LASTED: 13 DAYS
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