Food Storage, Preservation & Use Engine

Shelf Life is an AI tool for deciding what to do with food already in the kitchen.

Name the food, its current condition, the quantity, how it has been stored and what it may be used for, and Shelf Life determines the best next step: use it now, store it differently, refrigerate or freeze it, preserve it, cook with it, repurpose it or discard it.

The answer follows the food's actual state rather than a storage rule. Shelf Life separates ordinary quality loss from signs of spoilage and identifies practical ways to keep quality or use food before it is wasted.

next-step decision for any food

• Determines what to do with a food right now, given the state it is in: use it, store it differently, chill it, freeze it, preserve it, cook it, repurpose it or discard it.

food storage guide

• Determines how a specific food should be stored: temperature, containers, packaging, light and air.

shelf life lookup

• Determines how long a food keeps in the refrigerator, freezer or pantry in its current form.

date label reader

• Interprets best before, use by and sell by dates, distinguishing a quality date from a safety date, and what each does and does not tell you about the food in front of you.

grocery put-away planner

• Determines where each item from a shop goes, what needs breaking down or repackaging first, and what will not last the week as bought.

leftover and batch-cook storage guide

• Determines how cooked and prepared food should be cooled, portioned, packaged and held, and how long each keeps.

root cellar and no-fridge storage guide

• Determines how food can be stored without refrigeration, covering root cellars, cold pantries, cool dark storage, and the temperature, humidity, light and ventilation each requires.

stored produce checker

• Interprets sprouting, greening, shrivelling and other changes in stored roots, tubers, bulbs and alliums, and determines what remains usable.

pantry stocking and rotation planner

• Determines what stores long term, how it should be packaged, where it should sit, and how stock is rotated so nothing is lost at the back.

freezing guide

• Determines whether a food freezes well.
• Explains how to prepare and package a food for freezing, what quality changes to expect, how to thaw or use the food later, and when refreezing is appropriate.

freezer burn checker

• Identifies freezer burn, ice crystal damage and other frozen-storage quality loss, and determines what the food can still be used for.

preservation method picker

• Weighs how long the food needs to last, what form it is wanted in later, and what the quantity and equipment allow, and determines whether storage, freezing or a preservation method is the right route.
• Selects a suitable preservation method: canning, pickling, fermenting, drying, curing, salting, smoking, sugar preserving, fat preserving or vacuum sealing.

preserving recipe builder

• Explains the selected preservation method, including recipes, quantities, preparation, processing and storage.

canning guide

• Returns the canning method, preparation, quantities, processing and storage for the food being preserved.

pickling and brine guide

• Returns the brine, the proportions, the preparation and the timing for pickled and brined foods.

fermenting guide

• Returns the preparation, quantities, timeline and storage for a ferment, and what to expect at each stage.

drying and dehydrating guide

• Returns the preparation, drying conditions, timing and storage for dried foods.

curing, salting and smoking guide

• Returns the cure, the proportions, the preparation, the timing and the storage for cured, salted and smoked foods.

harvest and glut planner

• Divides a large quantity between immediate use, storage, freezing and preservation, and determines what must be dealt with first while the full range of options is still open.

historical preservation reference

• Explains the methods used before refrigeration — root cellars, larders, ice houses, salting, curing, smoking, drying, potting in fat and storing in oil — and the conditions that made each of them work.

leftover recipe generator

• Finds practical uses for surplus food, leftovers and food losing quality: cooking now, turning the food into another ingredient or dish, freezing portions or preserving for later.

food condition reader

• Interprets wilting, softening, drying, discolouration, separation, freezer burn and other signs of quality loss.
• Determines which uses remain appropriate given the food's condition and storage history.
• Separates ordinary quality loss from spoilage that changes the available options.

cut, cooked and opened food checker

• Determines the remaining life of a food after preparation, and how a whole, cut, cooked or opened food each keep differently.

use-first planner

• Prioritises groceries, leftovers, garden produce or batch-prepared food by identifying what should be used first, what can stay in storage, and what should be frozen or preserved before quality declines.

food waste audit

• Identifies what caused the loss — quantity, storage conditions, placement, packaging or timing — and what to change so it does not recur.

Enter the food and the situation in ordinary language. A food name alone is enough for a simple question.

Add the quantity, the current condition, and whether the food is raw, cooked, cut or opened.

Add how the food has been stored and for how long, along with available refrigerator or freezer space and any preservation equipment on hand.

State how long the food needs to last and what it will eventually be used for, since the intended use changes the method.

store food correctly

questions people ask:

"How should fresh ginger be stored?" · "What keeps basil fresh longest?" · "How should an opened jar of tahini be stored?" · "How long does cooked rice keep in the fridge?" · "Best way to store a cut pumpkin."

read a date on the packet

questions people ask:

"What does best before actually mean?" · "Use by or sell by — which one matters?" · "Yoghurt three days past its date." · "Does the date still apply once it's open?"

put a week's shopping away

questions people ask:

"Just did a big shop — what needs dealing with first?" · "Which of this goes in the freezer straight away?" · "How do I make a week of vegetables last a week?" · "Bought in bulk, no plan — where does it all go?"

store leftovers and batch-cooked meals

questions people ask:

"I batch-cooked five meals on Sunday — how do I store them?" · "How do I cool a big pot of stew safely?" · "How long do cooked lentils keep?" · "What should go in the freezer and what stays in the fridge?"

store food without a fridge

questions people ask:

"How do I store potatoes without a cool cupboard?" · "What can go in a root cellar?" · "Keeping onions and garlic through winter." · "No fridge — what keeps and what doesn't?"

deal with sprouting and greening

questions people ask:

"My potatoes have sprouted — are they still usable?" · "Green patches on potatoes." · "The garlic has gone soft and shot green shoots." · "Onions sprouting in the sack."

stock and rotate a pantry

questions people ask:

"What actually stores long term?" · "How do I keep flour and rice from going off?" · "Rotating a deep pantry so nothing gets lost." · "Vacuum sealing dry goods — worth it?"

freeze and thaw food

questions people ask:

"Does ricotta freeze well?" · "Should green beans be blanched before freezing?" · "Can lamb be refrozen after thawing?" · "How should tomatoes be frozen for sauce?" · "How do I thaw a whole duck safely?"

decide between storing it and preserving it

questions people ask:

"Should apples be frozen, dried or preserved?" · "Is it worth canning tomatoes or should I just freeze them?" · "I want these to last a year, not a month." · "Which method needs the least equipment?"

get a preserving recipe for what you have

questions people ask:

"Six aubergines and no pressure canner — what can I preserve?" · "A pickling recipe for shallots, enough for three jars." · "Turn 4kg of plums into something that keeps." · "Ferment this cabbage — walk me through it." · "A glut of chillies and a dehydrator."

can, pickle, ferment, dry or cure something

questions people ask:

"Water bath or pressure canner for these tomatoes?" · "How long do I dry apple rings and how do I know they're done?" · "Curing a pork belly — what ratio and how long?" · "My kraut has a white film on it." · "Cold smoke or hot smoke for this fish?"

deal with a harvest that has all come at once

questions people ask:

"The whole plum tree ripened this week." · "Twelve kilos of runner beans." · "What do I do first with a full apple crop?" · "Two crates of tomatoes and one free evening."

use food before it is wasted

questions people ask:

"My coriander is wilting — what can I do with it?" · "I have three kilos of pears going soft." · "What can I make with leftover roast pork?" · "I bought too much kale to use this week."

read the condition of food

questions people ask:

"Are soft carrots still useful?" · "Why has yoghurt separated in the tub?" · "What can be done with freezer-burned mince?" · "Cherry tomatoes have gone soft but not mouldy — what now?" · "Has bread gone stale or mouldy?"

plan what to use first

questions people ask:

"Which of this week's groceries should be used first?" · "I batch-cooked five meals on Sunday — what order should they go in?" · "What from the garden harvest needs dealing with today?" · "How do I stop the same vegetables being thrown out every week?"

find out how it was done before refrigeration

questions people ask:

"How did people keep meat through the winter?" · "What went in a root cellar and what didn't?" · "How was butter kept before fridges?" · "What is potting in fat?"

the decision

• which option applies — use it, store it, chill it, freeze it, preserve it, cook it, or let it go;
• why that option rather than the others;

storage conditions and how long it keeps

• the best storage location and conditions;
• preparation before storage;
• suitable containers or packaging;
• expected refrigerator, freezer or pantry life;
• what the printed date does and does not cover;

storing without a fridge

• the temperature, humidity, ventilation and light conditions required;
• what can be stored together and what cannot;
• expected life in cool storage;

freezing and thawing

• whether freezing suits the food;
• freezing, thawing and later-use instructions;

the preservation method

• preservation options for the food and quantity;
• a selected preservation method;
• what the method requires in equipment, time and ingredients;

the preserving recipe

• preservation recipes, ratios and procedures;
• preparation, packing and processing steps;
• what to look for at each stage, and what finished looks like;
• how the preserved food is stored, and how long it holds;

ways to use the food up

• cooking or recipe directions for food that needs using;
• ways to use surplus quantities;
• suitable uses for food that has lost quality;

what to use first

• what should be used first;

warning signs and when to throw it out

• warning signs to watch for;
• when the food should be discarded;

how to stop it happening again

• changes that prevent the same food being wasted again.

why water content and acidity decide most of it

Two properties settle more of this than anything else. Water is what spoilage organisms need, so removing it or binding it up with salt or sugar is what drying, curing and sugar preserving do. Acidity is what they cannot tolerate, and pH 4.6 is the line: below it a boiling water bath is enough, above it the food needs a pressure canner, because botulinum spores survive water at boiling point. Fruit, jams and proper vinegar pickles sit below the line. Vegetables, meat, beans, soups and most tomatoes sit above it, which is why tested tomato recipes add lemon juice or citric acid. The same two properties govern storage — high-water foods spoil fast and freeze badly, while acidic, salty and oily ones keep long after opening.

how each preservation method actually works

Every method takes away one of the things spoilage organisms need. Drying, salting and sugar preserving remove the water or bind it. Pickling adds acid from outside. Fermenting grows bacteria that make the acid themselves. Canning applies heat and then seals against anything getting back in. Fat preserving and vacuum sealing take away the air. Cold storage and freezing slow everything down without changing the food. The same cucumbers become a pickle, a ferment or a dried snack depending which is chosen, and the choice follows the form they are wanted in later.

what separates a ferment from a vinegar pickle

A vinegar pickle is sour on the day it is made and stays as it was, because nothing is growing in it. A ferment starts with salt and time, and the bacteria already on the vegetable produce lactic acid over days. The first is fast and fixed. The second builds flavour and changes texture as it goes, and keeps changing slowly in the fridge afterwards.

what a preserving recipe has to tell you that a ratio does not

A salt percentage is the smallest part of it. The recipe has to say how the food is cut and packed, because a spear ferments differently from a slice and a loosely packed jar floats. It has to say what the first three days look like — cloudy brine and rising bubbles are the ferment working, and batches get thrown away by people who read that as spoilage. It has to name kahm yeast as the white film you skim and mould as the fuzzy growth you don't. It has to say when the thing is finished, which is a taste and a smell rather than a date. The same applies to a cure judged on weight loss rather than days, fruit dried to leathery rather than brittle, and jam taken to a set rather than a time.

why you preserve a glut while it is still firm

Canning, pickling and fermenting all set the condition of the food at the moment it goes into the jar, and nothing improves in there. Softened produce can still be cooked or frozen, but the preservation routes have already closed. Preservation is usually the first option to go, not the last.

why storage method depends on the food

Water content, acidity, structure, preparation and exposure to air all affect how a food changes in storage, so meat, herbs, grains, cooked rice and whole onions each want different conditions. There is no single correct fridge.

which fruit and vegetables should not be stored together

Apples, bananas, tomatoes, avocados, pears and stone fruit give off ethylene as they ripen. Leafy greens, broccoli, cucumbers, carrots and herbs respond by yellowing and going limp, so a bowl of apples beside a bag of salad shortens the salad.

which foods should not go in the fridge

Cold slows respiration, which is why most produce keeps longer in it, but tropical and subtropical foods take chilling injury instead. Bananas blacken, basil goes dark and limp, and potatoes convert starch to sugar, which is why refrigerated potatoes fry dark and taste sweet. Whole tomatoes lose their aroma below about 12°C and do not get it back.

why a root cellar is not just a cold room

Root cellaring runs on four conditions at once: cool but above freezing, high humidity, air movement, and darkness. Take away any one and it fails differently — dry air shrivels carrots, still air rots them, light makes potatoes sprout and green. A cold pantry is the opposite arrangement, kept dry rather than humid, which is why bread, butter and cheese went there and root vegetables did not.

why stored roots and bulbs sprout

A potato, an onion and a garlic bulb are dormant, not dead, and warmth and light end the dormancy. Sprouting draws on the food's own stores, so the flesh softens and shrinks as the shoot grows. Greening on a potato is separate — that is chlorophyll from light exposure, and it travels with solanine, which is why a green potato is treated differently from a merely sprouted one.

why cut food does not keep like whole food

The skin on a whole fruit or vegetable is doing the protective work. Cutting removes it, exposes the interior to air, and introduces whatever was on the knife and the board. A whole pumpkin keeps for months and a cut one for days.

why cooked food needs to cool fast

Cooking kills most of what was living on the food and also destroys the barrier keeping things out, so cooked food picks up contamination easily. The first couple of hours matter more than the days it then spends in the fridge — food left to cool slowly in a deep pot spends that time in the range where bacteria multiply fastest. Divided into shallow containers it is through that range in minutes.

what a date on a packet is actually telling you

Most printed dates are quality marks set by the manufacturer, not safety limits, and they describe the food sealed and stored as intended. A use by date is the exception and is a safety limit. Sell by is aimed at the shop rather than at you. All of them stop applying the moment the seal is broken, after which the food itself governs — acidity, sugar, salt and oil all buy time, which is why mustard and jam last far longer after opening than pesto or passata.

what freezing does and does not do

Freezing stops microorganisms, it does not kill them, so the clock restarts on thawing and thawed food has less life left than fresh food had. Ice crystals rupture cell walls, which is why lettuce, cucumber, whole tomatoes and potatoes collapse when thawed and are only useful cooked. Blanching is about enzymes rather than microbes — the food's own enzymes keep working slowly at freezer temperature and degrade colour, texture and flavour over months. Freezer burn is water leaving the food, so it is dry rather than spoiled.

why frozen food needs labelling

Everything in a freezer looks alike after a month and identical after three. The date matters more than the contents, because freezing holds food safe almost indefinitely while quality falls on a schedule that varies by food — a few months for fatty fish and cooked dishes, closer to a year for lean meat and blanched vegetables.

why wilting reverses and softening does not

Wilting is water loss with the cell walls intact, so limp carrots and tired herbs often come back in cold water. Softening is the cell walls themselves breaking down, and that does not reverse — the food moves to cooking rather than raw use. Separation in yoghurt or a sauce is whey or an emulsion coming apart and stirs back in. Slime, sour smell and mould are microbial and belong to a different category from all three.

what food storage, preservation and use covers

Food storage, preservation and use cover a wide territory:

• storing fresh groceries and ingredients;
• putting away a weekly shop or a bulk buy;
• storing opened packages, jars and containers;
• storing leftovers and cooked food;
• storing batch-prepped meals;
• refrigerator, freezer and pantry life;
• date labels and what they cover;
• containers, packaging, temperature, light and air;
• stocking and rotating a pantry;
• storing food without refrigeration;
• root cellars, larders and cold pantries;
• sprouting, greening and stored-produce changes;
• freezing and thawing food;
• refreezing food;
• freezer burn and frozen-food quality;
• labelling and dating frozen food;
• vacuum sealing;
• choosing between storage, freezing and preservation;
• canning and jarring;
• pickling and fermenting;
• drying and dehydrating;
• curing, salting and smoking;
• sugar and fat preservation;
• preserving recipes, ratios and processing;
• preservation before refrigeration;
• using surplus food and seasonal gluts;
• using produce that is beginning to decline;
• turning food into recipes before the food goes to waste;
• changes caused by cutting, cooking or opening food;
• wilting, softening, drying and discolouration;
• quality loss, spoilage and warning signs;
• preventing recurring food waste.