A good wedge of cheese, a proper sourdough loaf and a bag of walnuts have something in common: they respond badly to casual treatment. Leave them in the wrong wrapper or the wrong corner of the kitchen and the decline is quick — a sweaty, tacky surface on the cheddar, a loaf that turns to leather by Wednesday, that bitter, old-oil edge in the nuts.

Three things cause most of the damage: air, moisture and warmth. The trick is knowing which one each ingredient minds most. Cheese cares about moisture, bread cares about temperature, and nuts care about air. Get those three right and a fortnight's worth of good ingredients stays good.

Cheese: wrap it so it can breathe

Cheese keeps ripening in your fridge. It needs a little air exchange and steady humidity, which is why the tightest option — cling film pressed hard against the paste — is usually the wrong one. Trapped moisture makes the surface sweat and turn tacky, and the ammonia smell of an over-ripened cheese concentrates against the plastic.

A better default: wrap the cheese in parchment or wax paper, then slide that bundle into a paper bag or a zip-lock bag left part-open. The paper breathes; the outer layer stops the fridge air drying the cheese into a brick. Keep everything away from the back wall, where things freeze.

Hard and semi-hard cheeses

Cheddar, Comté, Pecorino, Gouda and their relatives do best in the vegetable drawer, which is generally the most humid and least cold part of a fridge. If you have a genuinely cool larder, that is better still. Re-wrap every few days: if the paper feels damp, swap it for fresh. And keep cheese away from onions, smoked fish and anything strongly scented, because it will take on those smells within a day.

Soft, blue and fresh cheeses

Soft-ripened cheeses such as Brie and Camembert are happy in their original box with the lid slightly ajar, or in a lidded container with the paper left on. Blue cheese should be wrapped in foil or parchment and given its own container — the spores travel, and a loose wedge will inoculate everything else in the drawer. Fresh cheeses (mozzarella, ricotta, feta, chèvre) are the exception to the breathing rule: they are wet, perishable and want an airtight container, ideally with their brine, and should be eaten within a few days.

If a hard cheese grows a spot of mould, cut a generous centimetre around and beneath it and carry on. Soft and fresh cheeses are different: mould on a Brie or in a tub of ricotta means the whole thing goes. That is standard food-safety guidance, and not a judgement call worth making at home.

Bread: the fridge is the enemy

Cold speeds up the process that makes bread firm, which is why a loaf kept in the fridge often feels stiffer after a day than one left on the counter. A crusty loaf also loses its crust to the fridge's dry air. So keep bread out, and use the freezer for anything you won't eat within a couple of days.

• Day one: stand a cut loaf cut-side down on a board, or keep it in a paper bag.
• Days two and three: a bread box, or a paper bag inside a cloth. A linen bag works well for a round sourdough.
• Beyond that: slice it, wrap it tightly and freeze it. Toast straight from frozen — no thawing needed.
• Stale but not mouldy: run a crusty loaf quickly under the tap, shake off the excess, then bake at 200°C (400°F) for eight to ten minutes. It comes back for an hour or so, which is plenty for soup.
• Mouldy: bin it. Bread mould has threads you cannot see, so cutting off the visible patch is not enough.

One exception: a soft, sliced sandwich loaf actually does fine in the fridge if you keep it sealed, because it has already been engineered for pliability. Plastic bags suit soft bread and ruin crusty bread, so use them accordingly.

Nuts: buy small, store cold

Nuts are mostly fat, and fat turns rancid with heat, light and air. A bag of walnuts left open near a sunny window will taste bitter within weeks. The same nuts in a sealed jar in a cool, dark cupboard will hold for a couple of months, and in the fridge or freezer for considerably longer.

Buy amounts you will use in a month or two if you are keeping them in the cupboard, and decant into small jars with tight lids rather than repeatedly opening one big bag. Whole nuts keep better than chopped. If you buy ready-chopped nuts, or you use pine nuts, keep them in the freezer and take out what you need — they thaw in seconds in a warm pan.

Toast nuts in a dry pan for flavour, but let them cool completely before they go in a jar. Sealing warm nuts traps steam and leaves them soft and dull. The same rules apply to seeds, which turn just as quickly.

Freezer rules that actually work

Most disappointment with frozen food comes from air and ice rather than from freezing itself. A few habits make the difference:

1. Portion small. Freeze what you will use in one sitting, so you never thaw more than you need.
2. Wrap twice. Parchment or cling film first, then a freezer bag with the air pressed out, or a vacuum seal if you have one.
3. Label and date. A marker and a roll of tape cost almost nothing and save a lot of guesswork.
4. Grate hard cheese before freezing. Frozen cheddar turns crumbly and is awkward to slice, but it grates and melts beautifully — so do the grating first and freeze the shreds in a bag.
5. Skip the freezer for soft and fresh cheeses. Brie, ricotta and mozzarella lose their texture and go grainy. Eat them fresh instead.
6. Thaw cheese in the fridge, not on the counter, and let it come to room temperature for half an hour before serving so the flavour opens up.

A five-minute weekly reset

Storage works best as a small routine rather than a set of rules to remember. Once a week, open the cheese drawer, unwrap anything that looks damp and re-wrap it in fresh paper. Move the tail end of the loaf into the freezer, sliced. Sniff the nut jar — rancid nuts smell like old paint or stale oil, and the taste is bitter and lingering. Wipe out the bread box and let it dry properly before the next loaf goes in.

Keep your fridge at 0–4°C (32–40°F) and check it with a cheap thermometer rather than trusting the dial. Then buy less, more often, and eat it at its best. That is the whole trick: not preserving food for months, but giving good ingredients the few extra days they need to reach the table in the condition you paid for.

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