People have tried. Any time the government tries to do anything a substantial portion of the electorate throws a childish hissy fit and tries to make out that the Bolsheviks are coming to make their fries less tasty for no good reason.
I think the former makes much more sense than the latter, since it is literally being funded by the govt. That's a reasonable first step, or possibly only step, especially considering that most people on food stamps are also on govt-funded/subsidized healthcare (meaning taxpayers will end up footing the bill when they require expensive treatments resulting in part from an unhealthy diet).
I am sincerely curious to know your opinion.