How to reduce food waste at home: what actually works

Most household food waste is food that wasn't used in time. That is what the UK waste-reduction organization WRAP found when it looked at why edible food gets thrown away: nearly 40% of it sat unused until it turned. That changes what you should do about it. The fix is mostly ordering: use the perishable things first, freeze what you won't reach, and cook amounts people will actually eat.

So every habit that works shortens the distance between buying and eating. Buy for dinners you've planned. Put the delicate food at the front of the week. Freeze on day two or three, not day five. Below are the numbers behind that, a cheat sheet of official storage times, and a way of planning that spends a bunch of parsley twice.

Where the wasted food comes from

The scale first, briefly. The UN Environment Programme estimated that the world wasted 1.05 billion tonnes of food in 2022 across households, food service and retail, as much as 19% of the food that reaches the consumption stage. Households were the largest source by a wide margin: 631 million tonnes, an average of 79 kilograms per person per year. That is uncomfortable, and it is also useful: unlike the waste on a farm or in a warehouse, this is the part you control.

For the United States, EPA counted 66 million tons of wasted food from retail, food service and homes in 2019, and about 60% of it went to landfills. EPA's goal page says 349 pounds of food waste per person left the human food supply chain that year, and it sets a 2030 target of 164 pounds.

The most useful numbers for a kitchen come from WRAP, which measures UK homes in unusual detail. In 2022 households threw away 6.0 million tonnes of food and drink, and 4.4 million tonnes of that (73%) was edible; the rest was shells, bones and peels. WRAP estimates the edible part costs the average four-person household about £1,000 a year. By weight, fresh produce is the most wasted category, followed by meals (homemade and pre-prepared), bakery, and dairy and eggs.

Read those three bars as a to-do list. The first is a timing problem, the second a portioning problem, and the third mostly a matter of storage and preference. The rest of this article takes them in that order.

Fix the timing: buy for a plan, then order the week

Timing starts in the shop. Food you bought without a dinner in mind has no deadline, so it waits, and waiting is how a bag of spinach turns to slime. A list built from planned dinners gives every perishable a night. If you've never run a weekly plan, a simple weekly system is a place to start, and the ten-minute Sunday ritual is a habit that keeps it going.

The cheapest waste to avoid is the food you never bought. Before you add a third bag of anything perishable, ask which night uses it. If you can't name the night, leave it on the shelf. A half-empty fridge is not a failure; it is often the sign of a week that was planned.

Then order the week by how fast things turn. Fish, ground meat, poultry and soft greens go on the first two nights. Sturdy vegetables, cabbage and freezer dinners go late. And where two dinners can share a perishable, let them: the parsley you buy for Monday's fish can finish on Wednesday's rice.

Some ingredients make this easy. In our catalog of 148 recipes, lemons appear in 35, parsley in 29, carrots in 26, ginger in 25, scallions in 21, limes in 20, spinach in 17 and cilantro in 16. Parsley or cilantro shows up in 44 of them. If you're holding half a bunch of something, there is usually a dinner that wants the rest.

Tonight plans with this in mind. It leans toward dishes that use what's about to turn, it nudges nights that can share an ingredient toward each other, and after a shop a receipt scan fills its picture of your pantry so the shopping list only asks for what the week is missing. That is the same idea as cooking from what you have, with the bookkeeping done for you.

Store it so it lasts, and read the label for what it is

Set the refrigerator at or below 40°F (4°C) and the freezer at 0°F (-18°C). The FDA notes that appliance thermometers are the best way to know, and they're cheap. Then keep the ranges below in your head, or on the fridge door.

Bread deserves a mention, since bakery is the third most wasted category in WRAP's data. The Food Keeper gives commercial bread three to five months in the freezer, so slice a loaf and freeze half the day you buy it.

Then there is the label. Except for infant formula, a “use by” date is the manufacturer's estimate of best flavor or quality, and the FDA says plainly that it is not a food safety date. That doesn't make every date meaningless, and it doesn't make everything past a date fine. For meat, fish, eggs and leftovers, follow the chart's times, and remember the FDA's rule that perishable food shouldn't sit out for more than two hours (one hour above 90°F). Anything that has sat out longer isn't worth saving, whatever the date says. If someone in your home is pregnant, elderly or has a weakened immune system, follow the stricter official guidance for them and ask their doctor.

Freeze on day two, not day five

Most people freeze food as a last resort, on the day it is already tired. That's backwards. Freezing is the cheapest storage you have, and the FDA says food kept at 0°F stays safe indefinitely, with the listed times reflecting quality. So move the decision earlier. When you get home from the shop, split the week: what you'll cook in the next two days stays in the fridge, and the other raw meat, poultry and fish goes in the freezer with a date on it.

Freezing suits more dinners than people assume. Of our 148 recipes, 68 (46%) are marked freezer-friendly, and 47 of those are among the 100 free recipes. Freezer-friendly dinners covers which ones hold up and how to pack them.

Cook less of what gets left

A quarter of edible household waste, by WRAP's count, comes from cooking, preparing or serving too much. This one responds to watching more than to rules. For a week, notice what's left in the pot and on the plates: the rice, the pasta, the vegetable nobody loved. Then cook less of it, or plan to use it. Extra rice becomes fried rice. Extra roasted vegetables go into a wrap or a frittata. Extra sauce freezes in a jar.

Deliberate leftovers are a different animal from accidental ones. When you cook a double batch of something that keeps well, you've made a decision in advance, which is the point of any good plan. Cool it, get it into the refrigerator within two hours, and date the freezer portion.

The third bar, food seen as inedible or simply not liked, is mostly a negotiation at the table. Serve small amounts of new things, let people ask for seconds, and see feeding picky eaters for ways to do it that don't turn dinner into a standoff.

Rescue food that is only tired

Limp carrots, wilting greens, bruised fruit and stale bread are all still food. Roast the tired vegetables, or simmer them into a soup. Wilt greens into eggs or rice. Blend overripe fruit into a smoothie, or freeze it for baking. Turn stale bread into breadcrumbs or a bread salad. The rescue works when food is merely past its best. If it has gone slimy or smells wrong, let it go, and don't taste-test meat, fish or leftovers that have been out too long.

It helps to make the rescue routine instead of heroic. One night a week, cook from the eat-me-first shelf without shopping for it, and you'll find that a surprising share of what was headed for the bin makes a decent dinner.

When it's too late for the plate

Some food will still go. Shells, bones and peels are part of every household's waste: WRAP puts inedible parts at 27% of what UK homes throw away, and UNEP's figures include them too. Where you can compost, do: it keeps food out of landfills, and EPA reports that an estimated 58% of the fugitive methane emissions from municipal solid waste landfills come from landfilled food. Its Wasted Food Scale ranks preventing waste as the top priority. In practice that means the order of this article: buy less, use it in time, freeze early.