Planning the weekly shop takes about fifteen minutes and cuts food waste roughly in half. In Italy each person throws away around half a kilo of food a week, and most of it is not bought badly, it is bought without a plan: two people buy the same thing, a vegetable is bought with no dish in mind, and half of it ends up in the bin on Sunday.
Why does food get thrown away?
Three reasons, in order of size. Buying without a plan, which produces ingredients nobody has a use for. Buying twice, because two people in the same house do not know what the other bought. Storing badly, which shortens the life of fresh produce by days. The first two are solved on paper, the third in the fridge.
What does a fifteen minute plan look like?
Start from the calendar, not from recipes. Count how many dinners you will actually eat at home this week: if two of them are out, you need five, not seven. Then check what is already in the house, fridge and freezer included, and write down what has to be used first. Only then choose the meals, and only then write the list.
Choosing three fixed meals and leaving the rest flexible works better than planning seven. A week with a couple of open slots survives a change of plans without waste.
How do you write a list that actually works?
Write it in the order of the shop, not in the order you thought of things: fruit and vegetables, then fridge, then shelves, then frozen. You walk the shop once instead of three times, and you skip the aisles you do not need, which is also where the unplanned purchases live.
Write quantities, not just names. "Tomatoes" becomes "tomatoes 500 g". Without a number you buy what looks right, which is usually more than you need.
Why is a shared list better than a note on the fridge?
Because the person who notices something is missing is rarely the person who goes shopping. A note on the fridge only works if you are at the fridge. A list on everyone's phone is updated the moment the milk runs out, and whoever passes the supermarket first sees it. That single change removes most of the double purchases.
What do you do with what is left on Sunday?
Keep one evening a week with no plan and cook what is left: a frittata, a soup, a pasta with whatever vegetable survived. It costs nothing, it empties the fridge before the new shop, and it is the difference between throwing away half a kilo and throwing away nothing. Paniere's purchase history helps here too: it shows what you actually buy and how often, so next week you buy the right amount.