Frozen, tinned or fresh: Which foods are better for you?
At a glance
For nutrients: Frozen fruit and veg can retain nutrients particularly well – although fresh, tinned and frozen all count towards your five-a-day
For texture: Fresh often has the advantage if you're after a crisp texture
For convenience: Tinned and frozen have long shelf lives
For buying on a budget: Frozen and tinned can help prevent waste and work out cheaper
- Published
Is frozen fruit and veg as nutritious as fresh?
Many people assume fresh automatically means best – but it's not that simple.
Prof Keshavan Niranjan from the University of Reading explains that by the time fresh produce reaches the supermarket, it may already be less nutritious than when it was harvested.
That's because fruit and vegetables can start to lose some of their nutrients as soon as they're picked, especially vitamins C and B, which are sensitive to heat, light and oxygen.
Research, external suggests some fruit and veg retains more nutrients when frozen. For instance, one study found spinach loses 100% of its vitamin C, external in a week at room temperature, 75% if refrigerated but only 30% when frozen.
Green peas, broccoli and beans lose about half of their vitamin C within the first two days of harvest unless frozen, says Niranjan.
"I would say frozen food is fresher in many cases than so-called 'fresh' food," he adds.
Is tinned fruit and veg healthy?
Fruit and veg is usually canned within hours of picking, external. Then, once sealed, the tins are heat-treated to make them safe and shelf-stable. Heat can reduce some nutrients (heat-sensitive vitamins B and C, external for instance) although its effects vary between foods.
On the plus side, the canning process might help boost or retain other nutrients. For example, tinned tomatoes could be higher in magnesium and lycopene, external (an antioxidant) than fresh, depending on the processing method.
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Two of the five ingredients in this dish are tinned
Which is cheapest?
This can depend on the ingredient. A bag of frozen spinach might cost around the same as fresh, but it will have a lot more actual spinach in it, while a budget tin of tomatoes is likely going to be cheaper than the same weight of fresh.
Tinned and frozen fruit and veg also store for much longer than fresh, which helps eliminate waste and save money in the long term.
But fresh veg is often sold at discounted prices in supermarkets when it's near its best before date, so it's definitely possible to pick up a bargain.
Which gives the best texture?
Fresh can have the advantage here when you're after crisp or firm textures.
Canning makes things mushier – especially veg – and freezing can cause ice crystals that damage the food structure.
Best ways to cook frozen and tinned food
Plant-based
Frozen veg works a lot like fresh to cook with, it just may need a longer or shorter cooking time, depending on the vegetable.
Chef Theo Michaels, author of Canned, swears by tinned tomatoes, lentils and beans. He suggests:
Swapping half your beef mince for tinned lentils in a bolognese
Simmering tinned white beans, tomatoes and spices to make a base for roast fish, meat or veg
Use tinned peaches, apricots or pears for crumbles and compotes
Tinned and frozen seafood
There's more to tinned fish than tuna. Anchovies make an ideal addition to pasta dishes for salty and umami flavour and mackerel is really versatile – it's even great in dals.
Want to really push the boat out? Michaels suggests making a pasta sauce by simmering together tins of tomatoes, smoked mussels and octopus.
As for frozen bags of seafood, fish and prawns work really well in stews, curries, pies and fish cakes.
Frozen meat
The texture can differ from fresh but frozen meat is still full of flavour and affordable. Frozen diced beef and lamb are ideal for slow cooking in stews and curries.
Registered nutritionist Aliya Porter shares her tips on getting the most from tinned and frozen ingredients:
Mix varieties: Add a tin of mixed beans to your baked beans for more variety
Check the fibre: If the skin's removed from tinned fruit it will contain less fibre, so mix it up with fresh and frozen
Read the label: The NHS recommends fruit that's in juice instead of syrup, external, while veg in plain water without added salt is best
Don't overcook: Frozen veg is already blanched, so doesn't take as long to heat (overcooking can diminish some nutrients)
So which should I buy?
Tinned, frozen and fresh ingredients all earn their place in a healthy, balanced diet. Each have their own merits, and nutrient content can depend on the ingredient itself, among other factors like processing and storage.
Originally published April 2024. Last updated October 2026.
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