chapter 7 - CH APTER 7 TH E VI TAMI N S Today, r esear ch...

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Unformatted text preview: CH APTER 7 TH E VI TAMI N S Today, r esear ch hints that two of the major scour ges of humankind, car diovascular disease (CVD) and cancer , may be linked with low intakes of vitamins. (p.220) VI TAMI N DEFI N ED essential noncaloric organic nutrient needed in tiny amounts considered facilitators because they help make possible the processes by which other nutrients are digested, absorbed, and metabolized or built into body structures TWO TYPES OF VI TAMI N S FAT SOLUBLE Dissolve in lipids Require bile for absorption absorbed into the lymph and travel in blood in association w/ protein carriers can be stored in liver or with other lipids in fatty tissue can build up toxic concentrations WATER SOLUBLE absorbed directly into the bloodstream and travel freely most not stored in tissues excesses are excreted in urine immediate toxicity not as likely Two Types Of Deficiencies PRI MARY Occurs when a vitamin/ mineral is not consumed in sufficient amounts SECONDARY Occurs when a vitamin/ mineral absorption is impaired or excess excretion occurs Groups At Risk For Deficiencies Pregnant women Adolescent girls? Older Adults Poverty= children & adults Chronic Alcohol Abuse/ Drug Abuse Long-term chronic disease Liver & kidney disorders Effects of Cancer Treatment Use of multiple alternative therapies TH E FAT SOLUBLES VI TAMI N A Found only in animal sources, but beta- carotene (inactive provitamin) is found in plants. Beta-carotene is converted into vitamin A during absorption into intestinal wall. Known primarily for helping with vision in dim light if low vitamin=NI GHT BLI NDNESS Look At Pages 252-256 Become familiar with the multiple names for vitamins, an toxicity an deficiency symptoms Know significant sources for each vitamin VI TAMI N D Can be gained directly from the sun....
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This note was uploaded on 07/01/2011 for the course NTR 101 taught by Professor Hendry during the Spring '10 term at Holyoke CC.

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chapter 7 - CH APTER 7 TH E VI TAMI N S Today, r esear ch...

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