Chapter 7 - Selenium Selenium is: - A trace mineral - Found...

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Selenium Selenium is: - A trace mineral - Found in a few a mino acids - Necess ary for m aking thyroid hormon es - An a ntioxidant to spare vita min E and protect cell m e m br an es - Found e sp ecially in organ m e ats a nd nuts Antioxidant partner to Vitamin E - Glutathione peroxidase Deficiency - Heart diseas e - Prostat e cancer The a m ount of Selenium in plant foods d ep ends on food in soil Blood Functions - Transport of oxygen a nd nutrients to cells - Removal tissues from our body Compon ents of blood - Erythrocytes – red blood cells for transporting oxygen through the body - Leukocytes – white blood cells of the immun e syst e m - Platelets – cell frag m e nts that a ssist in blood clotting - Plas m a – the fluid portion of the blood Iron - a trace mineral - a com pon ent of the protein hemoglobin which carries oxygen in erythrocytes - a com pon ent of myoglobin which carries oxygen in muscle cells - a coenzym e involved in en ergy m et abolism of carbohydrat es, fats, a nd Two types of iron ar e found in foods - Heme iron – found in animal-based foods and more absorbable - Non-heme iron – not easily absorbed Iron is more easily absorbed - from m e at poultry and fish - in co mbination with vita min C Recommended intake - RDA varies b as ed on a g e, g end er, a nd other factors - 1.8 tim es higher for veg et arians - Higher for young wom en than for m e n Sources of iron
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- Meat, poultry, fish, clams, oysters, enriched cereals and breads What if you consume too much iron? - Iron overdose is the most common cause of poisoning deaths in children - Toxicity symptoms: nausea, vomiting, diarrhea, dizziness, confusion - Delayed treatment of iron toxicity can result in severe damage to the heart,  central nervous system, liver, kidneys What if you don’t consume enough iron? - Iron deficiency is the most common nutrient deficiency in the world - Iron deficiency anemia  – red blood cells do not contain enough hemoglobin - High-risk people include infants, young children, preadolescent girls, 
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This note was uploaded on 04/02/2008 for the course NATS 104 taught by Professor Lewis during the Spring '08 term at Arizona.

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Chapter 7 - Selenium Selenium is: - A trace mineral - Found...

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