From a Bloomberg View editorial arguing that state and local governments should be allowed to prevent food stamp recipients from spending their benefits on soda, potato chips, and other "junk food":
When the Food Stamp Act was adopted in 1964, hunger was a deep problem. Today, the far bigger public health threat is obesity and overconsumption of foods linked to chronic diseases -- such as diabetes -- that contribute to escalating medical costs. In low-income families, overweight children outnumber those considered underweight by 7-to-1.
Earlier coverage of this issue here.