Zinc

This volume is the newest release in the authoritative series issued by the National Academy of Sciences on dietary reference intakes (DRIs). This series provides recommended intakes, such as Recommended Dietary Allowances (RDAs), for use in planning nutritionally adequate diets for individuals based on age and gender. In addition, a new reference intake, the Tolerable Upper Intake Level (UL), has also been established to assist an individual in knowing how much is "too much" of a nutrient. Based on the Institute of Medicine's review of the scientific literature regarding dietary micronutrients, recommendations have been formulated regarding vitamins A and K, iron, iodine, chromium, copper, manganese, molybdenum, zinc, and other potentially beneficial trace elements such as boron to determine the roles, if any, they play in health. The book also: Reviews selected components of food that may influence the bioavailability of these compounds. Develops estimates of dietary intake of these compounds that are compatible with good nutrition throughout the life span and that may decrease risk of chronic disease where data indicate they play a role. Determines Tolerable Upper Intake levels for each nutrient reviewed where adequate scientific data are available in specific population subgroups. Identifies research needed to improve knowledge of the role of these micronutrients in human health. This book will be important to professionals in nutrition research and education.

Learn about zinc, its importance, and its characteristics.

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Humankind's use of zinc stretches back to antiquity, and it was a component in some of the earliest known alloy systems. Even though metallic zinc was not "discovered" in Europe until 1746 (by Marggral), zinc ores were used for making brass in biblical times, and an 87% zinc alloy was found in prehistoric ruins in Transylvania. Also, zinc (the metal) was produced in quantity in India as far back as the thirteenth century, well before it was recognized as being a separate element. The uses of zinc are manifold, ranging from galvanizing to die castings to electronics. It is a preferred anode material in high-energy-density batteries (e.g., Ni/Zn, Ag/Zn, ZnJair), so that its electrochemistry, particularly in alkaline media, has been extensively explored. In the passive state, zinc is photoelectrochemically active, with the passive film displaying n-type characteristics. For the same reason that zinc is considered to be an excellent battery anode, it has found extensive use as a sacrificial anode for the protection of ships and pipelines from corrosion. Indeed, aside from zinc's well-known attributes as an alloying element, its widespread use is principally due to its electrochemical properties, which include a well-placed position in the galvanic series for protecting iron and steel in natural aqueous environments and its reversible dissolution behavior in alkaline solutions.

Traumatic brain injury (TBI) accounts for up to one-third of combat-related injuries in Iraq and Afghanistan, according to some estimates. TBI is also a major problem among civilians, especially those who engage in certain sports. At the request of the Department of Defense, the IOM examined the potential role of nutrition in the treatment of and resilience against TBI.

During the 1950s and 1960s, the U.S. Army conducted atmospheric dispersion tests in many American cities using fluorescent particles of zinc cadmium sulfide (ZnCdS) to develop and verify meteorological models to estimate the dispersal of aerosols. Upon learning of the tests, many citizens and some public health officials in the affected cities raised concerns about the health consequences of the tests. This book assesses the public health effects of the Army's tests, including the toxicity of ZnCdS, the toxicity of surrogate cadmium compounds, the environmental fate of ZnCdS, the extent of public exposures from the dispersion tests, and the risks of such exposures.

Anaemia and malaria are two related problems of public health significance in malaria-endemic countries, including Ghana, that continue to impact negatively on pregnancy outcomes, despite interventions being put in place to address them. The reasons for the apparent lack of efficacy of routine iron supplementation in reducing the risks of preterm and other adverse pregnancy outcomes are not clearly established in Ghana. It is not also known whether all pregnant women benefit from iron supplementation and whether there are some other factors that limit the effectiveness of prenatal iron supplementation. This study tested the primary hypothesis that prenatal zinc supplementation in combination with malaria prophylaxis and an iron and folic acid intervention package in a zinc-deficient and malaria-endemic population will increase mean birth weight. A prospective double-blind, randomised controlled trial (RCT) was therefore conducted in Ghana from September 2005 to November 2006. The intervention group received combined 40 mg zinc as zinc gluconate and 40 mg elemental iron as ferrous sulphate supplement. The control group received 40 mg elemental iron as ferrous sulphate. Both groups received also malaria chemoprophylaxis, with sulfadoxine pyrimethamine (SP) and 400 μg folic acid. The effect of iron-zinc supplementation on mean birth weight, geometric mean plasma zinc concentrations, mean Hb change and geometric mean serum ferritin concentrations at 34-36 weeks of gestation was masked by a strong interaction between supplement type and the iron status of participants. Overall, prenatal iron-zinc supplementation resulted in no detectable difference in mean birth weight and length of gestation between iron-zinc supplemented group and the group that received standard routine antenatal services. However, among anaemic women (Hb