HNF 150 Lecture Notes - Lecture 21: Molybdenum, Manganese, Fluoride

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Minerals: trace minerals (intake < 100 mg/day, iodine, iron, zinc, selenium, fluoride, chromium, copper, manganese, molybdenum. 2019: major minerals (intake >100 mg/day, calcium, chloride, magnesium, phosphorus, potassium, sodium, sulfur, trace minerals. Lecture notes: bioavailability and absorption of minerals. Bioavailability: the degree to which the amount of an ingested nutrient is absorbed and is available in the body. Food components affect digestion and absorption: some nutrients and food components increase bioavailability, minerals are bound to other molecules in food and must be released and absorbed to act in the body, some minerals compete for absorption. Mineral absorption is increased when increased need: deficiency, pregnancy, etc. Gastric acidity: hcl makes minerals more bioavailable by converting to a form more easily absorbed. Vitamins can enhance bioavailability of some minerals: vitamin c enhances iron absorption, vitamin d enhances calcium, phosphorus and magnesium absorption. Some minerals have specific binding proteins to carry them in the blood and even in cells, where others travel freely.

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