This comprehensive work examines iron deficiency in human nutrition, exploring the metabolism of iron and the various factors that influence iron balance within the body. The author discusses the health consequences of iron deficiency and presents methods for assessing iron status through biological indicators. The book also addresses the epidemiological aspects of iron deficiency worldwide, providing insights into its prevalence and impact on populations. Written by Serge Hercberg, this 203-page volume serves as a detailed resource for understanding the physiological, clinical, and public health dimensions of iron deficiency.