For many Americans who live at or below the poverty threshold, access to healthy foods at a reasonable price is a challenge that often places a strain on already limited resources and may compel them to make food choices that are contrary to current nutritional guidance. To help alleviate this problem, the U.S. Department of Agriculture (USDA) administers a number of nutrition assistance programs designed to improve access to healthy foods for low-income individuals and households. The largest of these programs is the Supplemental Nutrition Assistance Program (SNAP), formerly called the Food Stamp Program, which today serves more than 46 million Americans with a program cost in excess of $75 billion annually. The goals of SNAP include raising the level of nutrition among low-income households and maintaining adequate levels of nutrition by increasing the food purchasing power of low-income families. In response to questions about whether there are different ways to define the adequacy of SNAP allotments consistent with the program goals of improving food security and access to a healthy diet, USDA's Food and Nutrition Service (FNS) asked the Institute of Medicine (IOM) to conduct a study to examine the feasibility of defining the adequacy of SNAP allotments, specifically: the feasibility of establishing an objective, evidence-based, science-driven definition of the adequacy of SNAP allotments consistent with the program goals of improving food security and access to a healthy diet, as well as other relevant dimensions of adequacy; and data and analyses needed to support an evidence-based assessment of the adequacy of SNAP allotments. Supplemental Nutrition Assistance Program: Examining the Evidence to Define Benefit Adequacy reviews the current evidence, including the peer-reviewed published literature and peer-reviewed government reports. Although not given equal weight with peer-reviewed publications, some non-peer-reviewed publications from nongovernmental organizations and stakeholder groups also were considered because they provided additional insight into the behavioral aspects of participation in nutrition assistance programs. In addition to its evidence review, the committee held a data gathering workshop that tapped a range of expertise relevant to its task.

This report was prepared in response to a request from the Economic Research Service (ERS) of the U.S. Department of Agriculture (USDA). It summarizes the discussions at a February 1998 workshop convened by the Committee on National Statistics; the Board on Children, Youth, and Families; and the Food and Nutrition Board. The fiscal year 1998 (FY1998) appropriations bill for USDA gave ERS responsibility for all research and evaluation studies on USDA food assistance programs. The bill provided $18 million to fund these studies, an increase from $7 million in FY1997. ERS asked the Committee on National Statistics for assistance in identifying new areas of research and data collection and in further improving the evaluation studies of food assistance programs. By bringing together many who work on evaluation of food assistance programs, policy analysis, survey methods, nutrition, child nutrition and child development, outcome measurement, and state welfare programs, the issues presented and discussed at the workshop provided ERS with information that could be used to develop a framework for their research program.