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In the United States, food waste is estimated at between 30 and 40 percent of the food supply, according to the USDA. A large part of it happens at home, a few leaves and leftovers at a time, which is good news: it’s the part you can change without anyone else’s help.
The habits below are ordered by how much they help. The first three do most of the work.
1. Plan meals around what’s already open
The most effective habit is also the least glamorous: before you plan the week, look in the fridge. Whatever is open, wilting or nearly out of date is the starting point for the next meal, not an afterthought.
Practically, that means the half bag of spinach becomes Monday’s pasta and the open coconut milk becomes Tuesday’s curry — before you plan anything that needs new shopping. If you’re not sure what those leftovers add up to, ChefBook’s free What Should I Cook wizard takes a list of what you have and ranks real recipes by how well they match. The guide to cooking with the ingredients you have shows how.
2. Shop from a list built from your meals
Impulse buys and “just in case” extras are what spoil. A list written from the week’s actual recipes buys what you’ll cook and nothing else.
The easiest version is a weekly meal plan whose ingredients go straight onto a grocery list. Cross off what you already have before you leave, and the list shrinks to the gaps.
3. Plan one leftovers night
Cooking for four when there are two of you is fine — if the extra portions have a job. Put a leftovers night (or a “pantry night”) in the plan every week, so the containers in the fridge get eaten instead of rediscovered.
The USDA’s food safety guidance is to eat refrigerated leftovers within 3 to 4 days, or freeze them. If you know you won’t get to them in time, freeze them on day one, not day four.
4. Understand date labels
Date labels cause a lot of good food to be thrown away. In the US, the USDA explains that, apart from infant formula, product dates are generally about quality rather than safety:
| Label | What it means |
|---|---|
| Best if used by / Best before | When the food is at its best quality. It’s usually still safe after, if stored properly — check it. |
| Sell by | A date for the shop’s stock control, not for you. |
| Use by | The last date recommended for peak quality. For many chilled foods, treat it as the date to eat or freeze by. |
Rules differ by country — in the UK and EU, “use by” on chilled foods is a safety date — so read labels with your own country’s rules in mind. Whatever the label, if food smells, looks or tastes wrong, don’t eat it.
5. First in, first out
Shops rotate stock so the oldest sells first. Do the same at home:
- New tins and jars go behind the old ones.
- New yogurt goes behind the open one.
- Keep an “eat me first” spot at the front of one fridge shelf for anything open or close to its date.
6. Store food where it lasts longest
A few changes make produce last noticeably longer:
- Keep the fridge at 40 °F (4 °C) or below — check it with a cheap thermometer.
- Wrap herbs in a damp paper towel, or stand parsley and coriander in a glass of water like flowers.
- Keep onions, potatoes and garlic somewhere cool, dark and dry — not in the fridge, and not touching each other.
- Bread lasts far longer in the freezer than on the counter; toast slices straight from frozen.
7. Freeze more than you think you can
Most cooked meals, bread, grated cheese, cooked rice, stock, ripe bananas and herbs chopped into oil all freeze well. Freeze in flat bags or single portions and label them with the date — “mystery soup” is how frozen food ends up wasted too.
8. Cook the scraps
Some of what gets thrown away is perfectly good food:
- Broccoli stalks: peel, slice and stir-fry with the florets.
- Vegetable peelings and onion ends: keep a bag in the freezer and make stock when it’s full.
- Stale bread: breadcrumbs, croutons or bread pudding.
- Overripe bananas: banana bread or smoothies.
- Parmesan rinds: simmer in soups and sauces.
9. Cook the right amount
Over-cooking is a quiet source of waste, especially with rice and pasta. Check the servings before you start and adjust the quantities to the number of people actually eating — see how to scale a recipe for the arithmetic.
Where to start
You don’t need all nine. Pick two: plan around what’s open and shop from a meal-based list. Together they deal with the biggest causes — buying too much and forgetting what you have. Add the rest as habits form.
A well-stocked but small pantry helps too; the pantry staples list covers what’s worth keeping.
Questions people ask
What is the biggest cause of food waste at home?
Buying more than you’ll eat and forgetting what’s already open. Planning meals around what you have, and shopping from a list, tackles both.
Is food safe to eat after the best-before date?
Usually, if it was stored properly — in the US, “best if used by” dates are about quality, not safety (except infant formula). Check it, and if it smells, looks or tastes off, throw it away. In the UK and EU, “use by” dates on chilled food are safety dates; follow them.
How long do leftovers last in the fridge?
The USDA recommends eating refrigerated leftovers within 3 to 4 days, or freezing them.
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