NUTR2001 Lecture Notes - Lecture 1: Atrophic Gastritis, Parietal Cell, Plant Cell
24 Aug 2018
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Factors determining individual nutrient requirements: likelihood of people to consume certain foods, size of portion. E. g. brown rice contains more vitamin e than white, but would still require a large portion size in order to meet the requirement: bioavailability. *nutrient must be bio accessible in order to be bioavailable: bioconversion: fraction of a bioavailable nutrient that is converted to its active form. Haem iron found in meat is more bioavailable that non-haem iron as it is absorbed intact. Non-haem has to be soluble in lumen in order to be taken up. Ferric form is used in supplements despite ferrous being more bioavailable, as ferrous undertakes oxidative phosphorylation which can cause problems: folate. Polyglutamate is less bioavailable than monoglutamate: vitamin b6. Can be bound to glycosides, but if it is then its usually less bioavailable: niacin. Esterified to polysaccharides (nyacitin) in mature maize. When nutrients compete for the same carrier sites, ending up taking an effect on each other.
