On Sunday, Amir cleans his fridge. He finds soft carrots and a bag of salad that he forgot to use. He throws them away. He feels unhappy because he paid for food that nobody ate.
Before his next shopping trip, Amir tries a different plan. First, he checks his fridge and kitchen cupboards. Then he chooses three meals he wants to cook. He writes a shopping list with the things he needs. He does not put rice on the list because there is already a large bag at home.
At the supermarket, Amir sees a special offer on tomatoes. Two large bags cost less than usual. He thinks about his plan. He only needs a few tomatoes, so he buys a smaller amount. The offer is not useful if he cannot eat all the food.
At the end of the week, Amir checks his fridge again. This time, there is less food to throw away. Planning takes a few minutes, but it helps him remember what he has and avoid buying too much.