Most food waste is a storage problem, not a cooking one

What follows is the working version of reducing food waste: the decisions in the order you actually meet them, with the reasoning attached.

The dates mean different things

A use-by date is about safety and should be respected, particularly on meat, fish and ready meals. A best-before date is about quality, and food is generally perfectly edible well past it.

Confusing the two accounts for an enormous quantity of discarded food, and the labelling has been criticised for exactly that reason. Sensory judgement — looking, smelling, tasting a little — remains valid for best-before items and not for use-by ones.

Storage decides shelf life

Herbs stored upright in water in the fridge last weeks rather than days; the same herbs in the bag they came in last three days. Onions and potatoes stored together make each other spoil faster, and both dislike the fridge.

Bread staling is a moisture migration process that the fridge accelerates, which is why the fridge is the worst place for it and the freezer is the best. Ethylene is the mechanism behind several of these pairings: apples, bananas and tomatoes release it as they ripen, and it ripens then spoils whatever is stored in the same bowl or drawer.

A fridge is not one temperature

The door is the warmest part and swings several degrees every time it is opened, which makes it the worst place for milk and the traditional place to keep it. The coldest shelf in most designs is the bottom one, which is also where raw meat belongs so that nothing can drip onto anything below it.

The part that matters: a fridge packed solid stops air circulating and develops warm pockets, while a nearly empty one loses its cold every time the door swings. Your national food safety guidance publishes a recommended fridge temperature, and setting yours with a cheap fridge thermometer is worth doing once, because the numbers on most dials are settings rather than degrees.

Buy for the week you will actually have

Shopping for an ambitious week and living an ordinary one is the mechanism by which fresh produce is thrown away. A smaller planned shop plus one top-up produces less waste than a single large one, at the cost of an extra trip. The freezer absorbs the difference and is underused for almost everything except the things people already freeze.

Multibuy offers are the specific trap, since the saving only exists if the second one gets eaten and the price was set in full knowledge of how often it is not.

Freeze more things than you think

Milk, cheese, bread, herbs in oil, cooked grains, stock, wine for cooking and most vegetables all freeze acceptably. Freezing in portions you would actually use is what determines whether it gets eaten or excavated in a year. Labelling with contents and date is the difference between a freezer and an archive.

What people notice on thawing is texture rather than anything else: milk separates and needs shaking, hard cheese crumbles and is better cooked than sliced, and neither of those is a sign something has gone wrong.

Substitute freely; the method matters more than the shopping list.

Cook from what is oldest

A single habit — checking the fridge before deciding what to cook, rather than after — prevents most household waste. Dishes that absorb odds and ends — soups, frittatas, fried rice, tray bakes — are worth having in the repertoire for this reason alone.

In practice, treating leftovers as an ingredient rather than as a repeat meal is what makes them get eaten. Where you are genuinely unsure whether something has gone too far, your national food safety guidance is the place to check rather than a rule of thumb, and it is markedly stricter for rice, shellfish, eggs and anything already cooked and cooled.

The takeaway

Look in the fridge before you decide what to cook. That is most of it.

The good version is the one you can make on a Wednesday.