That is a very good point on planning for shopping and cooking. And it can be tricky to estimate depending on how many people you cook for. It could be valuable to see how different countries educate their consumers on food preparation.
This is such an interesting project. Food is an everyday material that we may use mindlessly but so often cooking can be about pride and satisfaction in doing something well. The process of creating with food can encourage mindfulness and also force the consumer to look at choices around food more carefully.