NTR 222 LM 8 PT 1 Outline.docx - Learning Module 8 Vitamins...

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Learning Module 8:Vitamins Part 1: Intro & Fat Soluble VitaminsA.Historical Perspectivea.Term “vitamin” coined in – 1912i.Ppl realized substances in foods - vital to lifeb.Vitamin A identified in – 1913c.Vitamin B-12 identified in – 1947B.What Vitamins Look Likea.Individual unitsb.All corners are carbonsc.Organici.Can be destroyed by light or heatd.Not stablei.Ex: Vit C – very easily destroyede.Do not break down into energyf.Some have precursorsi.Other nutrients that can be turned into that vitaming.Some have inactive formi.Body has to do things to put it in its active form1.Ex: Vit Dh.Bioavailabilityi.How well is the vit absorbed?ii.How well is it able to be used by tissues/cells of the bodyC.Factors that Affect Bioavailabilitya.Water soluble vs fat solublei.Water soluble vits:1.Need to be solubilized in water in order to be absorbed and used by the bodya.Makes them a little more bioavailableii.Fat soluble vits:1.Need protein carriersa.Stored in fat so may make them at times less bioavailableb.Efficiency of Digestioni.How well is the nutrient digested and then absorbed?1.A lot absorbed the way they are bc they’re single units2.Some (ex: folic acid) have to be altered in digestive tract before they can be absorbedc.Previous Nutrient Intake/Statusi.If you are deficient of a nutrient:a.Body absorbs more of itd.Other foods eaten at same time can affect how nutrient is used
e.Method of Food Preparationi.If cooking fruit/veggie (ex: Vit C) in a lot of water:1.Then it leeches out that Vit C into the water2.So unless you’re consuming the water – you’re not getting that vitaminf.Source of the Nutrienti.Natural vs Synthetic1.In some cases:a.Natural is just as bioavailable as synthetic2.In some cases:a.Synthetic version is betteri.Ex: Folic acidg.Fractional Absorptioni.Don’t assume that your body absorbs 100% of that nutrientii.Fractional Absorption:1.Body only absorbs a certain percentage of that nutrient2.Ex: CalciumD.Everything has an Upper Limit!

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