11 Sep 2017 --- The Supplemental Nutrition Assistance Program (SNAP), formerly known as Food Stamps, only covers 43 to 60 percent of what it costs to consume a diet consistent with the US Department of Agriculture (USDA) MyPlate guidelines for what constitutes a healthy diet. This is according to a new study from North Carolina State University (NC State) and the Union of Concerned Scientists, which lays out in stark terms the challenges lower-income households face in trying to eat a healthy diet.