FSN 101 Lecture Notes - Lecture 12: Dental Caries, Goitre, Hemoglobin
8 Dec 2016
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Difficult to study: only trace amounts in the body. Animals sources of mineral are generally better absorbed. Toxicity is an important issue- many of these are heavy metals. 2 types of iron: heme (hemoglobin and myoglobin) Found in small amounts in every cell. Consumption of heme with non-heme enhances non-heme absorption. Determined by body"s need: hepcidin- hormone produced in the liver. Hindered by phytic acid, oxalic acid, high fiber, high calcium, polyphenols. Hemoglobin in red blood cells: transports oxygen and carbon dioxide, high turnover, high demand for iron. Most at risk: children 500k in u. s, chronic blood loss, vegans, women of childbearing years. Signs: paleness, brittle nails, fatigue, poor temperature control, poor growth. Rda is 8 mg/day for adult male. Rda is 18 mg/day for female age 19 to 50. Average intake exceeds rda for men; low for some women. Signs: diarrhea, constipation, nausea, abdominal pain, causes death due to respiratory collapse (shock)
