Your (the government’s) stated goal is to get food stamp recipients to eat healthier food.
A) Limit the foods that food stamp recipients can purchase to healthier options or perhaps (using the electronic cards) require a certain percentage of food stamp purchases include fruits and vegetables? or
B) Require any store (including convenience stores) that accept food stamps stock at least three types of food in each of the four food groups making no demands on the food stamp recipients themselves?
If you are the federal government, you chose “B” (see the Albuquerque Journal story linked above or the federal comments page). Remember that grocery stores are a relatively low-margin business and that especially in densely-packed urban areas shelf space is at a premium. How many convenience stores clinging to existence will be driven out of business by this ridiculous regulation? Also, is there going to be a new corps of USDA employees checking store shelves to make sure they have adequate offerings in each food group? How much will that cost?
Lastly, while the idea of government micromanaging dietary choices is generally repugnant, if the government is going to regulate anyone, it should be recipients of a government program, not store owners.