Dr. Glidden talks about sports nutrition.
Chromium is a mineral that humans require in trace amounts. Chromium enhances the ction of insulin, a hormone that is vital to the metabolism and storage of fat, protein, and carbohydrate in the body. As in the case with all minerals, dietary intakes can not be determined ostensibly, because the content of the mineral is extensively affected by agricultural or finishing applications of the particular foods, or the soil that the food was grown in might be devoid of the mineral chromium.
Reference: Schwarz K, Mertz W. Chromium(III) and the glucose tolerance factor. Arch Biochem Biophys 1959;85:292-5.
Calcium is an essential nutrient, and is the most abundant mineral in the body. Calcium is required for many functions in the body including muscle function, nerve transmission, hormonal secretion, and vascular contraction and vasodilation to name a few. In fact there are over 270 diseases which are caused by a calcium deficiency.
Zinc is an essential nutrient which is involved in numerous functions of cellular etabolism. It acts as a catalyst of approximately 100 enzymatic activities in the body playing a role in immune function, protein synthesis, wound healing and cell division. Zinc also supports and promotes normal growth and development of a fetus during a pregnancy.
Reference: Sandstead HH. Understanding zinc: recent observations and interpretations. J Lab Clin Med 1994;124:322-7. http://www.ncbi.nlm.nih.gov/pubmed/8083574?dopt=Abstract
Selenium is an essential trace mineral and is an important cofactor in the production of antioxidants enzymes recycling glutathione in the body. Selenium disrupts the carcinogenic process early and helps prevent tumors from forming. It inhibits DNA mutations and functions as an antioxidant. In a recent double blind trial, selenium supplementation reduced prostate cancer incidence by 63 percent.
Reference: (Clark LC; Dalkin B; Krongrad A; Combs GF Jr; Turnbull BW; Slate EH; Witherington R; Herlong JH; Janosko E; Carpenter D; et al. Decreased incidence of prostate cancer with selenium supplementation: results of a double-blind cancer prevention trial. British Journal of Urology, 1998 May, 81(5):730-4.)