Nutrition Water and Minerals notes

Nutrition Water and Minerals notes - FDNS 2100 Human...

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FDNS 2100 Lee Human Nutrition and Food Water and Minerals 1. Water (1) The most indispensable nutrient 1) Makes up about 60% of an adult’s body weight 2) Found in: Blood vessels, Cells, Chemical structure of cells, tissues, organs (2) Why is Water the Most Indispensable Nutrient? 1) Carries nutrients throughout the body 2) Serves as the solvent 3) Cleanses the tissues and blood of wastes 4) Actively participates in many chemical reactions 5) Acts as a lubricant around joints 6) Serves as a shock absorber 7) Aids in maintaining the body temperature (3) Water Balance (Figure 8.2, p280) 1) ____Dehydration_____ Water loss Progression of symptoms: thirst weakness exhaustion and delirium death Sign of Dehydration (Table 8.1, p281) 2) ________Water Intoxication________ Dangerous dilution of body fluids resulting from excessive water ingestion Symptoms: headache, muscular weakness, lack of concentration, poor memory, loss of appetite 3) Regulation of Water Balance Blood too concentrated water drawn out of salivary glands mouth becomes dry Blood too concentrated, or blood volume too low or blood pressure too low _______hypothalamus_________ sends signal to the brain to register thirst and signals to the pituitary to release a hormone that causes the kidneys to conserve water ________ respond to blood sodium concentration by increasing or decreasing water excretion, as appropriate Drink too much water during a marathon? Water and sports drinks regularly consumed during a race in order to avoid dehydration Drinking more fluid than one needs can cause hyponatremia 13% of runners finishing a marathon had hyponatremia (4) Water Recommendation: DRI : ≈80% of day’s need for water 1) From beverages and drinking water Men: 13 cups of fluid Updated on 080810 1
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FDNS 2100 Lee Human Nutrition and Food Women: 9 cups of fluid 2) Remaining water need is met from consumed foods (5) What kinds of water are better? Hard water vs. Soft water- different kinds of minerals, soft water has more sodium Public water systems vs. Private wells Tap water vs. Purified tap water Tap water vs. Bottled water (sometimes just comes from the tap) Fluoridation 2. Minerals (1) Naturally occurring, Inorganic, Homogenous, Chemical elements (Essential nutrients) 1) Major minerals Found in the body in amounts exceeding 5 grams 2) Trace minerals Found in the body in amounts less than 5 grams
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Nutrition Water and Minerals notes - FDNS 2100 Human...

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