HNF 260 Study Guide - Midterm Guide: Selenomethionine, Hemorrhoid, Riboflavin
1 Jun 2016
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Iron (fe: foods, heme iron fe2+ (meats) well-absorbed, non-heme iron fe3+ (leafy greens) less bioavailable than heme iron, hemoglobin, myoglobin. Iron is added to fortified grains: rda: menstruating women need more than men. Women"s needs drop to equal men"s needs after menopause: deficiency: iron is the most common trace mineral deficiency. Iron absorption: tightly controlled; only 10% is lost per day, efficiency of absorption depends on the body"s needs for iron, size of iron stores. Mucosal block mechanism that prevents absorption of excess iron. Iron-containing enzymes: energy metabolism, drug and alcohol metabolism, enzyme co-factor, synthesis of neurotransmitters, production of immune cells. 100+ different enzymes require zinc as a cofactor: dna and rna synthesis. Immune function: deficiency, dermatitis, immune dysfunction, phytic acid in wheat, unleavened bread (impaired growth/dwarfism. In variety of foods liver, shellfish, nuts, seeds, lentils: transport protein ceruloplasmin brings cu to cells, toxicity, risk of liver damage, neurological damage.
