FAO and WHO express their gratitude for the contributions of the experts who participated in this consultation. A number of the participating experts prepared draft papers which, after discussion and amendment, formed the basis for the text of the chapters of this report. FAO and WHO also wish to thank the many other experts who contributed papers, and reviewed and modified the draft papers prior to the consultation. Special appreciation is offered to Dr Mark Hegsted, who served as Chairman of the Expert Consultation and provided guidance in the preparation of the report. The efforts of Dr Joyce Beare-Rogers, who undertook the large task of assisting the two organizations in preparing for the consultation, compiling and reviewing draft papers, and developing the final report are gratefully acknowledged.