NFS284H1 Lecture Notes - Lecture 10: Zinc Deficiency, Phytic Acid, Iron Supplement
13 Mar 2018
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Document Summary
Iron intake of concern for women of reproductive age: zinc intake of concern for older adults. Iron: poorly absorbed- only 5-15% of total intake is absorbed, heme iron. From animal sources: myoglobin in meat, best absorbed, non-heme iron. Leafy green vegetables, legumes, whole and enriched grains: not as well absorbed. Increase iron consumption without increasing calories: acidic foods increase leaching. Iron supplements contain ascorbic acid to stabilize ferrous form: meat, fish, poultry (mfp) protein enhances absorption, ex. add beef to chili to enhance absorption of iron from beans. First identified in populations with diets high in phytates and low in animal products: unleavened breads high in phytates, phytates bind zinc rendering it unabsorbable. Zinc deficiency characterized by stunted growth and sexual development: zinc is a regulator of gene expression, vitamin a and d and hormones bind to a protein receptor that contain zinc fingers, this complex regulates gene expression.
