There is only one shopping list available; the one generated automatically from the diary. It would be convenient if users could generate their own custom lists with the ability to add non-food items as well as food, independently from the diary. Possible use cases:
User plans dinner for guests, needs to do the shopping for all of them, logs their own intake in the diary. The automatic shopping list would include that, but the guests' food would be missing. Host could save the guests' food in a custom list without polluting or abusing their diary.
User needs to get non-food stuff like toilet paper and the like. Without custom lists, they would have to employ other means of organizing that part of the grocery run. Custom lists keep all of it in the same place.
There is only one shopping list available; the one generated automatically from the diary. It would be convenient if users could generate their own custom lists with the ability to add non-food items as well as food, independently from the diary. Possible use cases: