The physical, emotional, and intellectual impact of nutrition on children's ability to learn is the subject of this guide for school personnel. The guide is divided into two parts and includes two appendices. Part 1, "What We Know About the Relationship Between Nutrition and Learning," reviews research linking nutrition and academic performance. Children's behavioral development and learning ability are affected by such early nutritional influences as low birthweight and the adequacy of food consumed in day care. Evidence of the impact of hunger and undernutrition on learning is presented. A number of recent studies indicate the positive effects of child nutrition programs on children's nutritional status and learning ability. The problems of obesity and the consumption of sugar and food additives are discussed. Part 2, "Putting Into Action Our Knowledge About the Relationship Between Nutrition and Learning," provides suggestions for solving students' nutritional problems. Steps that school employees can take to ensure that children have access to nutrition programs are enumerated. School action to ensure the provision of healthful food and nutrition education is described. The guide concludes with an outline of a model school nutrition policy. Appendix A describes several national nutrition programs that help children. Appendix B lists 66 references. (AF)