sci241_week5_reading2 - Corrine J Humphrey/Index Stock...

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(© Corrine J. Humphrey/Index Stock) C H A P T E R 9 C O N C E P T S Water is an essential macronutrient; to maintain fluid balance, intake must equal losses. Sodium, chloride, and potassium are electrolytes. These and other minerals are important in regulating blood pressure. Calcium, phosphorus, and magnesium are minerals needed for bone health. Iron is a component of the oxygen transport protein hemoglobin. Iron-deficiency anemia is the most common nutritional deficiency worldwide. Copper functions in iron transport, connective tissue synthesis, lipid metabolism, and antioxidant protection. Zinc is needed for many enzymes and for the activity of a number of vitamins and hormones. Selenium is an essential part of the antioxidant enzyme glutathione peroxidase. Iodine is essential for the synthesis of the thyroid hormones. Chromium helps insulin function. Fluoride is important for healthy teeth and bones. Can taking a supplement of one mineral cause a deficiency of another? How long can a person survive without water? Does eating too much salt raise blood pressure? Are iron supplements dangerous? J u s t A T a s t e
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Reuters Health Study: Overweight Children Risk Iron Deficiency Tuesday, July 6, 2004—Overweight children are at double the risk of being iron deficient, perhaps because of bad diet or lack of exercise, a study said on Tuesday . . . . Iron deficiency is a global problem most commonly found in poorer people lacking proper nutrition, but the study concluded that the rising number of obese people in the developed world should be checked and treated for it. Too little iron in the blood can cause anemia and lead to learning and behavioral problems as well as pose limits on work and exercise. One out of seven U.S. children is overweight, a three-fold increase in the past 30 years, and many do not get screened for iron deficiency, Yale University researcher Karen Nead wrote in the journal Pediatrics . To read the complete article, go to news/fullstory_18782.html. B7.6/NewsonHealth3.htm 279 9 Water and Minerals Water and Minerals Make Up the Sea Within Us Some Minerals Are Needed in Large Amounts, Some in Minute Amounts We Consume Minerals from Both Plant and Animal Sources Water Is Essential to Life Over Half of Your Body Weight Is Water Water Requirements Depend on Water Losses Sodium, Potassium, and Chloride Are the Electrolytes Electrolytes Are Essential for Nerve Conduction, Muscle Contraction, and Fluid Balance The Modern Diet Is High in Sodium and Low in Potassium Hypertension Is High Blood Pressure Mineral Intake Can Affect the Risk of Hypertension The Total Diet Is Important for a Healthy Blood Pressure Calcium and Other Minerals Are Needed for Healthy Bones Bone Is a Living Tissue Osteoporosis Increases the Risk of Bone Fractures Calcium Levels Are Carefully Regulated Phosphorus Is Found in Bone and Almost Everywhere Else Phosphorus Levels Are Regulated to Promote Bone Health
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