You realize you can't buy cigarettes with food stamps don't you? foods classified as "Ice cream" is possible, but even then you can have those as recommended for certain circumstances, for example, after having having a tonsillectomy, physicians suggest it to help reduce the swelling. Pediapops are also used to help counter dehydration and are recommended to those with diarrhea and stomach flu. Popsicles, ice cream and sherbet are also recommended to help reduce fever, even in a hospital setting. Hell now they even have " diet ice cream" recommended for diabetics so it isn't like this is like it used to be.
The problem is when you start trying to pick and choose for others what they allowed and not allowed to have you run into counteracting physicians orders and causing unforeseen conflicts. For example, Blanket rules such as no sugary products could cause a someone with hypoglycemia to die within minutes. Even diabetics who have had too much insulin can die very quickly if their blood sugar drops too low as a result and they are recommended to keep a few pieces of candy in their purse or pocket in case of emergency at al times. People can develop conditions at any point in time thus would not have time to get everything pre approved before an event takes place. The amount of time it takes for someone to get what they need can be a matter of life and death.
Much of the problem is that people do not have equal access to the same foods. Sometimes the only store within access to their home does not have fresh food forcing them into poor diets more on that issue here:
Environmental justice is concerned with an equitable distribution of environmental burdens. These burdens comprise immediate health hazards as well as subtle inequities, such as limited access to healthy foods.We reviewed the literature on neighborhood ...
www.ncbi.nlm.nih.gov
This is especially difficult for those with low income, or disabled as the only store that they can access form their home with their wheelchair or have memorized the route for if they are blind, or have other difficulties because they can only buy what the store sells. If you limit what they can buy with their foods stamps and the store doesn't sell anything of their list of approved items, they will just starve instead. Many of the elderly and disabled cannot even cook from themselves. TBH they really should extend food stamps to precooked food as well that way the disabled, elderly and homeless have options to be able to eat as well.
( Also that has Zero Impact to Trump's policy changes here.)