Chapter 08 minerals PDF

8 Minerals  Objectives ⚫ List at least two food sources of given minerals. ⚫ List one or more functions of given minerals. ⚫ Describe the recommended method of avoiding mineral deficiencies....

8 Minerals  Objectives ⚫ List at least two food sources of given minerals. ⚫ List one or more functions of given minerals. ⚫ Describe the recommended method of avoiding mineral deficiencies. 8-2 Copyright © 2007 Thomson Delmar Learning, a division of Thomson Learning Inc. All rights reserved.  Facts ⚫ The human body is made up of specific chemical elements. ⚫ Oxygen, carbon, hydrogen, and nitrogen make up 96% of body weight. ⚫ The remaining elements, minerals, represent 4% of body weight. ⚫ Minerals are essential for good health. 8-3 Copyright © 2007 Thomson Delmar Learning, a division of Thomson Learning Inc. All rights reserved.  Minerals ⚫ Inorganic elements necessary to build tissues, regulate body fluids, and assist in various body functions. ⚫ Found in all body tissues ⚫ Cannot provide energy by themselves but contribute to production of energy within the body 8-4 (continues) Copyright © 2007 Thomson Delmar Learning, a division of Thomson Learning Inc. All rights reserved. (continued) Minerals ⚫ Enriched foods are foods to which nutrients, usually B vitamins and iron, have been added to improve their nutritional value. 8-5 Copyright © 2007 Thomson Delmar Learning, a division of Thomson Learning Inc. All rights reserved.  Classification ⚫ Major minerals (stored in the body such as calcium ⚫ ( cheese) chloride(seaweeds) potassium(banana),sodium (sardines)  Required in amounts greater than 100 mg a day ⚫ Trace minerals (present in living tissue in small amount such iron ( nuts /seeds),manganese (shellfish)copper (organ meats)iodine (oysters) zinc (cereals) etc.  Needed in amounts smaller than 100 mg a day 8-6 Copyright © 2007 Thomson Delmar Learning, a division of Thomson Learning Inc. All rights reserved.  Electrolytes minerals of the blood and other body fluids that carry electric charge including amount of water of the body and muscle function. Significant Electrolytes includes Sodium,Potassium, Chloride, Magnesium,Calcium,Phosphate and Bicarbonate -Ions  Electrically charged atoms resulting from mineral salts dissolved in water  Cations are positively charged.  Anions are negatively charged.  Must be balanced within the body.  These ions are known as electrolytes. 8-7 (continues) Copyright © 2007 Thomson Delmar Learning, a division of Thomson Learning Inc. All rights reserved. (continued) Electrolytes ⚫ Maintain the body’s fluid balance ⚫ Contribute to electrical balance ⚫ Assist in transmission of nerve impulses and contraction of muscles ⚫ Help regulate the body’s acid-base balance (balance between input (intake) and output (elimination) 8-8 Copyright © 2007 Thomson Delmar Learning, a division of Thomson Learning Inc. All rights reserved.  Toxicity ⚫ Toxicity (harmful) occurs when concentrated forms of minerals are taken regularly over time. ⚫ An excessive amount of one mineral can lead to deficiency of another mineral. ⚫ Changes in nearly all tissues may result. ⚫ Concentrated minerals should be used only if prescribed. 8-9 Copyright © 2007 Thomson Delmar Learning, a division of Thomson Learning Inc. All rights reserved.  Major Minerals ⚫ Calcium (cheese and milk) ⚫ Phosphorus(organ meats/turkey ) ⚫ Potassium (banana/potatoes) ⚫ Sodium (canned meat/ bacon) ⚫ Chloride (sea weeds/tomatoes) 8-10 Copyright © 2007 Thomson Delmar Learning, a division of Thomson Learning Inc. All rights reserved.  Calcium (Ca) Normal Values (8.6-10.3 mg/dl) ⚫ Human body contains more calcium than any other mineral ⚫ In combination with phosphorus, gives strength and hardness to bones and teeth ⚫ Bones provide storage for calcium. ⚫ Needed for normal nerve and muscle action, blood clotting, heart function, and cell metabolism 8-11 Copyright © 2007 Thomson Delmar Learning, a division of Thomson Learning Inc. All rights reserved.  Calcium Regulation ⚫ Hormonal system regulates delivery of calcium to cells. ⚫ Parathyroid glands release a hormone telling the kidneys to retrieve calcium before it is excreted when blood calcium levels drop. 8-12 (continues) Copyright © 2007 Thomson Delmar Learning, a division of Thomson Learning Inc. All rights reserved. (continued) Calcium Regulation ⚫ This hormone works with calcitriol (medication that treats low calcium level of the body caused by kidney disease) causing increased release of calcium from bones by stimulating activity of osteoclasts (large bone cell which absorbs bone tissue during growth and healing) ⚫ Both actions increase blood calcium levels. ⚫ Food rich in calcium (Cheese,leafy green,yogurt and milk) 8-13 (continues) Copyright © 2007 Thomson Delmar Learning, a division of Thomson Learning Inc. All rights reserved. (continued) Calcium Regulation ⚫ Every cell needs calcium, and normal blood calcium levels are maintained even if intake is poor. ⚫ Bones become increasingly fragile as calcium is withdrawn from them. ⚫ Osteoporosis(bone condition that leads to loss of bone mass ) may result from years of low calcium intake. 8-14 (continues) Copyright © 2007 Thomson Delmar Learning, a division of Thomson Learning Inc. All rights reserved. (continued) Calcium Regulation ⚫ Osteoblasts increase bone mass if blood calcium level is high until one is age 30– 35 years old. ⚫ Bone mass (function of bone size &key determinant of bone strength)will remain stable in women (until menopause) with adequate consumption of calcium, phosphorus, and vitamin D. 8-15 Copyright © 2007 Thomson Delmar Learning, a division of Thomson Learning Inc. All rights reserved.  Calcium Sources ⚫ Milk and milk products ⚫ Dark green, leafy vegetables  When vegetables contain oxalic acid, as spinach the calcium remains unavailable because the oxalic acid binds it and prevents it from being absorbed.  When the intake of fiber exceeds 35 g/ a day, calcium will also bind with phytates (phosphorus compounds found in some high-fiber cereals), which also limits its absorption. 8-16 (continues) Copyright © 2007 Thomson Delmar Learning, a division of Thomson Learning Inc. All rights reserved. (continued) Calcium Absorption ⚫ Enhances absorption of calcium  Vitamin D (oily fish inc.salmon.mackerel, and sardines)  Calcium-to-phosphorus ratio that includes no more phosphorus than calcium  Presence of lactose(sugar present in milk that breakdowns to give glucose ) ⚫ Retards(delays) absorption  Lack of weight-bearing exercise 8-17 Copyright © 2007 Thomson Delmar Learning, a division of Thomson Learning Inc. All rights reserved.  Calcium Requirements ⚫ 0–6 months 210 mg ⚫ 6–12 months 270 mg ⚫ 1–3 years 500 mg ⚫ 4–8 years 800 mg ⚫ 9–18 years 1,300 mg ⚫ 19–50 years 1,000 mg ⚫ 51–70+ years 1,200 mg 8-18 (continues) Copyright © 2007 Thomson Delmar Learning, a division of Thomson Learning Inc. All rights reserved. (continued) Calcium Requirements ⚫ Pregnant women  14–18 years: 1,300 mg  19–50 years: 1,000 mg ⚫ Lactating women same as nonlactating women of same age Source: Dietary Reference Intakes, Food and Nutrition Board, National Academy of Sciences-Institute of Medicine, 1997 8-19 Copyright © 2007 Thomson Delmar Learning, a division of Thomson Learning Inc. All rights reserved.  Calcium Supplements ⚫ Calcium carbonate, the form found in calcium-based antacid tablets, has the highest concentration of bioavailable calcium. ⚫ Appear to be absorbed most efficiently when consumed in doses of 500 mg ⚫ Check for United States Pharmacopeia (USP)-approved products, which are unlikely to contain lead. 8-20 Copyright © 2007 Thomson Delmar Learning, a division of Thomson Learning Inc. All rights reserved.  Calcium Deficiency ⚫ Rickets(vit.d deficiency) results in poorly formed bone structure and causes bowed legs, “pigeon breast,” enlarged wrists or ankles, and stunted growth. ⚫ “Adult rickets” (osteomalacia) causes bones to become soft. ⚫ Osteoporosis(brittle/fragile) causes brittle bones. ⚫ Tetany, characterized by involuntary muscle movement, results from insufficient calcium in the blood. 8-21 Copyright © 2007 Thomson Delmar Learning, a division of Thomson Learning Inc. All rights reserved.  Calcium Excess ⚫ Excessive intake may:  Cause constipation  Cause kidney stones  Inhibit the absorption of iron and zinc 8-22 Copyright © 2007 Thomson Delmar Learning, a division of Thomson Learning Inc. All rights reserved.  Phosphorus (P) (yogurt/salmon ) ⚫ Constituent of all body cells ⚫ Necessary for the formation of strong, rigid bones and teeth; metabolism of carbohydrates, fats, and proteins; proper acid-base balance; and effective action of several B vitamins 8-23 Copyright © 2007 Thomson Delmar Learning, a division of Thomson Learning Inc. All rights reserved.  Phosphorus Sources ⚫ Stored in bones; absorption is increased in the presence of vitamin D ⚫ Protein-rich foods such as milk, cheese, meats, poultry, and fish ⚫ Cereals, legumes, nuts, and soft drinks 8-24 Copyright © 2007 Thomson Delmar Learning, a division of Thomson Learning Inc. All rights reserved.  Phosphorus Deficiency ⚫ Deficiency is rare. ⚫ Excessive use of antacids(agents that counteracts or neutralizes acidity ) affects absorption. ⚫ Symptoms of deficiency include bone demineralization (loss of minerals), fatigue, and anorexia (lack of appetite) 8-25 Copyright © 2007 Thomson Delmar Learning, a division of Thomson Learning Inc. All rights reserved.  Potassium (K) (Normal Values- 3.5-5.2 mEq/L) ⚫ Found primarily in intracellular fluid ⚫ Essential for fluid balance and osmosis ⚫ Maintains fluid level within the cell ⚫ Necessary for transmitting nerve impulses and muscle contractions 8-26 Copyright © 2007 Thomson Delmar Learning, a division of Thomson Learning Inc. All rights reserved.  Potassium Sources ⚫ Fruits: especially melons, oranges, bananas, and peaches ⚫ Vegetables: mushrooms, Brussel sprouts, potatoes, tomatoes, winter squash, lima beans, and carrots 8-27 Copyright © 2007 Thomson Delmar Learning, a division of Thomson Learning Inc. All rights reserved.  Potassium Deficiency and Excess ⚫ Deficiency = hypokalemia(low potassium in the blood stream)  Caused by diarrhea, vomiting, diabetic acidosis, severe malnutrition, or excessive use of laxatives or diuretics  Symptoms include nausea, anorexia, fatigue, muscle weakness, and heart abnormalities ⚫ Excess = hyperkalemia(high potassium level in the blood stream  Caused by dehydration, renal failure, excessive intake  Cardiac failure can result. 8-28 Copyright © 2007 Thomson Delmar Learning, a division of Thomson Learning Inc. All rights reserved.  Sodium Normal Values-135-145mEq/L ⚫ Primary function is the control of fluid balance in the body ⚫ Maintains acid-base balance ⚫ Participates in the transmission of nerve impulses essential for normal muscle function 8-29 Copyright © 2007 Thomson Delmar Learning, a division of Thomson Learning Inc. All rights reserved.  Sodium Sources ⚫ Table salt contains 40% sodium. ⚫ One teaspoon of table salt contains 2,000 mg of sodium. ⚫ Naturally available in animal foods ⚫ Dietary Reference Intake for sodium is 1,500 mg. ⚫ Tolerable upper limit is 5,800 mg, which is easily exceeded by the general population. 8-30 Copyright © 2007 Thomson Delmar Learning, a division of Thomson Learning Inc. All rights reserved.  Sodium Deficiency ⚫ Caused by severe vomiting, diarrhea, and heavy perspiration ⚫ Can upset the acid-base balance ⚫ Tetany resulting from alkalosis(condition of body fluid or tissue that cause weakness and cramping) can develop. 8-31 Copyright © 2007 Thomson Delmar Learning, a division of Thomson Learning Inc. All rights reserved.  Sodium Excess ⚫ May cause edema and resulting hypertension ⚫ Associated with hypertension and congestive heart failure ⚫ Treatment includes sodium-restricted diets; 3–4 g (no added salt, ) or 1–2 g sodium-restricted diet. Diets below 1 g are rarely prescribed. 8-32 Copyright © 2007 Thomson Delmar Learning, a division of Thomson Learning Inc. All rights reserved.  Iron (Fe) Normal Values Male -70-175mcg/dl Female- 50-170mcg/dl ⚫ Delivers oxygen to body tissues ⚫ Component of hemoglobin ⚫ Component of myoglobin(sub unit of hemoglobin), a protein compound in muscles that provides oxygen to cells ⚫ Used by enzymes that are involved in making amino acids, hormones, and neurotransmitters 8-33 Copyright © 2007 Thomson Delmar Learning, a division of Thomson Learning Inc. All rights reserved.  Iron Sources ⚫ Meat, poultry, and fish are the best sources of iron. Animal flesh contains heme iron(form of iron most readily absorbed by body) which is absorbed more than twice as efficiently as nonheme iron. ⚫ Nonheme iron is found in whole-grain cereals, enriched grain products, vegetables, fruit, eggs, meat, fish, and poultry. 8-34 Copyright © 2007 Thomson Delmar Learning, a division of Thomson Learning Inc. All rights reserved.  Iron Requirements ⚫ Recommended Daily Allowance doubled during pregnancy; difficult to meet by diet alone ⚫ Iron supplement commonly prescribed during pregnancy. ⚫ Increased need during infancy and teens 8-35 Copyright © 2007 Thomson Delmar Learning, a division of Thomson Learning Inc. All rights reserved.  Iron Deficiency ⚫ Caused by insufficient intake, malabsorption, lack of stomach acid, or excessive blood loss ⚫ Most common nutrient deficiency worldwide is iron-deficiency anemia ⚫ Symptoms include fatigue, weakness, irritability, shortness of breath, pale skin, and spoon-shaped fingernails 8-36 Copyright © 2007 Thomson Delmar Learning, a division of Thomson Learning Inc. All rights reserved.  Iron Excess ⚫ Hemochromatosis(iron overload) is a condition resulting from an inborn error of metabolism that causes excessive absorption of iron.Sign&symptoms include joint pain, fatigue,weakness etc. ⚫ Much iron in the body contain in hemoglobin (component of red blood cell that enables them to carry oxygen and deliver it to body tissues.) ⚫ “Hemachromatosis-disorder in which body can build up too much iron in skin, heart ,liver ,pancreas and joints.” ⚫ Untreated, can damage liver, spleen, and heart ⚫ To control buildup of iron, clients with this condition must give blood on a regular basis. 8-37 Copyright © 2007 Thomson Delmar Learning, a division of Thomson Learning Inc. All rights reserved.  Iodine (I) ⚫ Component of thyroid hormones, thyroxine (T4), and triiodothyronine (T3) ⚫ Necessary for the normal functioning of the thyroid gland, which determines rate of metabolism ⚫ Sources include iodized salt, seafood, and some plant foods grown in soil bordering the sea 8-38 (continues) Copyright © 2007 Thomson Delmar Learning, a division of Thomson Learning Inc. All rights reserved. (continued) Iodine (I) ⚫ Additional amounts needed during pregnancy and lactation ⚫ Lack of iodine results in decrease in thyroxine and triiodothyronine ⚫ Gland grows, forming a lump on the neck, called a goiter. 8-39 (continues) Copyright © 2007 Thomson Delmar Learning, a division of Thomson Learning Inc. All rights reserved. (continued) Iodine (I) ⚫ Myxedema is a condition of hypothyroidism(cond. where thyroid doesn’t release thyroid hormone in the blood stream) in adults. ⚫ Cretinism( underactive thyroid function at birth) is low thyroid in a child; physical and mental development are retarded 8-40 Copyright © 2007 Thomson Delmar Learning, a division of Thomson Learning Inc. All rights reserved.  Zinc (Zn) (oyster, red meat ,poultry) ⚫ Cofactor(cause) for more than 300 enzymes ⚫ Essential for growth, wound healing, taste acuity, glucose tolerance, and mobilization of vitamin A within the body ⚫ Sources include meat, fish, eggs, dairy products, wheat germ, and legumes 8-41 (continues) Copyright © 2007 Thomson Delmar Learning, a division of Thomson Learning Inc. All rights reserved. (continued) Zinc (Zn) ⚫ Increased requirements during pregnancy and lactation ⚫ Symptoms of deficiency include decreased appetite, taste acuity, delayed growth, dwarfism, poor wound healing, anemia, acnelike rash, impaired immune response 8-42 Copyright © 2007 Thomson Delmar Learning, a division of Thomson Learning Inc. All rights reserved.  Selenium (Se) (seafoods /organ meat) ⚫ Constituent of most body tissues ⚫ Concentrated in liver, kidneys, and heart ⚫ Component of an enzyme that acts as an antioxidant, thereby protecting cells against oxidation and sparing vitamin E ⚫ Sources include seafood, kidney, liver, muscle meats ⚫ High doses are toxic, causing vomiting, loss of hair and nails, and skin lesions. 8-43 Copyright © 2007 Thomson Delmar Learning, a division of Thomson Learning Inc. All rights reserved.  Copper (Cu) (shellfish,beans,nuts) ⚫ Found in all tissues; heaviest concentration in the liver, kidneys, muscles, and brain ⚫ Helps in formation of hemoglobin; aids in transport of iron to bone marrow for the formation of red blood cells; and participates in energy production ⚫ Sources include organ meats, shellfish, legumes, nuts, cocoa, whole-grain cereals, and human milk 8-44 (continues) Copyright © 2007 Thomson Delmar Learning, a division of Thomson Learning Inc. All rights reserved. (continued) Copper (Cu) ⚫ Deficiency is rare. ⚫ People with malabsorption conditions and gross protein deficiency such as premature infants; clients on long-term parenteral nutrition programs lacking copper; and people taking excess zinc supplements are candidates for deficiency. ⚫ Anemia, bone demineralization, and impaired growth can result. 8-45 (continues) Copyright © 2007 Thomson Delmar Learning, a division of Thomson Learning Inc. All rights reserved.  Fluoride (F) ⚫ Increases resistance to dental caries, and may strengthen teeth and bones ⚫ Sources include fluoridated water, fish and tea, as well as commercially prepared foods with fluoridated water. ⚫ Deficiency can result in increased tooth decay. ⚫ Excess can cause permanent discoloration or mottling of children’s teeth. 8-46 Copyright © 2007 Thomson Delmar Learning, a division of Thomson Learning Inc. All rights reserved.  Conclusion ⚫ Megadoses of minerals are dangerous. ⚫ Minerals are necessary to promote growth and regulate body processes. ⚫ Minerals originate in soil and water and are ingested via food and drink. ⚫ Deficiencies can result in anemia, rickets, and goiter. ⚫ Excess can be toxic, resulting in hair loss and changes in nearly all body tissues. 8-47 Copyright © 2007 Thomson Delmar Learning, a division of Thomson Learning Inc. All rights reserved.