In “Nutrition, Food Security, and Obesity,” Harold S. Beebout, a senior fellow at Mathematica Policy Research, Inc., and chief information officer at the Child and Family Services Agency, District of Columbia, reviews what is known about nutrition, food security, and obesity. He relies on the following data sources: the Continuing Survey of Food Intake for Individuals (CSFII), the CPS, the National Health and Nutritional Examination Survey (NHANES), and state administrative data reported to the U.S. Department of Agriculture. Beebout first examines the forces behind the dramatic decline in food stamp rolls, which dropped by 9.1 million (35 percent) between August 1995 and July 2000. He describes how the welfare reform law (PRWORA) restricted eligibility, particularly for able-bodied adults who have no children and who work less than twenty hours per week. He adds that many legal immigrants were disqualified under the legislation as well. But, he notes, these changes explain only about 20 percent of the food stamp decline. Most of the decline occurred among households with children, many of which still appear to be eligible for benefits.