What they should do is Categorize what the funds are drawn from on the card.
i.e....if you have $100 on the card, $30 can be used to purchase Meat, $25 for fruits and vegetables, $25 for Dairy, $20 for Grains. Once you spend your allotment on meat, you can't purchase any more. It would make people eat a more balance meal and stop rolling through with that same $100 on just Lobsters and Steaks
I know this is simplistic but you get my point,
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