Put some frozen or tinned fruit and veg into your trolley for when you run out of fresh – frozen can be more nutritious than fresh because it’s frozen so soon after picking. Tinned fruit and ...

Tinned fruit, on the other hand, is picked at peak ripeness and then canned in a matter of hours. “They are more ripe, which will have some benefits,” notes Prof Kuhnle.

These are foods made of unprocessed or minimally processed foods and processed ingredients, such as jam, tinned fruit and vegetables, homemade bread, cheeses and pickles. These foods have ...