Should food stamps only be used for healthy foods?

I’ve been mulling over this comment, posted a few days ago: “I am a physician, bone-weary of asking my patients about their diets, only to be told they consume 6 to 12 sodas a day plus chips/candies/cakes which they say they buy with their food stamps. Why can’t we get the food stamps program modified like the WIC program, where it will only pay for certain foods, i.e. fresh veggies, fresh fruits, low-fat dairy products, beans/legumes, fresh poultry or fish, whole grain breads and pasta. No soda, candy, cake, chip, pie?”

This is a difficult issue, one with which food advocates struggle mightily. I’m curious to hear what readers think of this? Weigh in, please.