I just read a couple weeks ago that soft drinks were the number one item that people bought with food stamps. It was a large percentage - I can’t remember exactly what it was. That’s when people started to question the benefit of food stamps, but to the public in terms of cost and to the people who use them in terms of their health.
If such a restriction occurred. The lawsuits would fly hot and heavy that you’re stigmatizing the poor. Psychologists specializing in the mental health of the underclass would appear and spring into action. All intoning sonorously on TV news shows and in front of Congress about the damage being done. Learned studies would be instantly published showing the psychological damage would last generations.