Unit 25 Water1
Water2       50-65% of total body weight       Survive 6 weeks or longer without food       Survive only days without w...
Functions of Water3       Provide shape and structure to cells       Regulate body temperature       Aids in digestion ...
Water losses4       On average, adults lose approximately 1750 to 3000        mL of water daily       Insensible water l...
Water and Fluoride5       Water is a major source of fluoride       Fluoride - formation and maintenance of enamel      ...
Water losses6       Sensible water losses from urine and feces make        up the remaining water loss       Because the...
Water Intake7       35-55% consumed comes from tap/bottled water       49-63% comes from other beverages       19-25% c...
Water in Food8       Fruits and vegetables        - made up of 70-90% water       Meats        - made up of 50-70% water...
Foods with High water content9       Lettuce       Watermelon       Broccoli       Carrots       Grapes       Tomato...
Bottled vs. Tap Water10        Both are regulated by the FDA        25% of bottled water is actually tap water        “...
Plastic Bottles and BPA11        Certain types of plastics contain BPA (bisphenol A)        Softening compound that make...
How much do we need?12        Men AI = 3.7 L per day (approx. 15 cups)         - 3 L coming from water and beverages     ...
How do we know if we’re getting enough?13        Thirst – poor indicator of hydration status – may be         2-3% dehydr...
Fluids That Don’t Hydrate14        Fluids with >8% carbohydrates can increase         dehydration         - can also draw...
Carbohydrate and Sodium Contents15
Estimating Fluid Needs During16     Exercise        Sweat rate         - Fluid loss per hour of exercise         - Sum of...
Inadequate Intake of Water17        Dehydration        Impaired mental function        Impaired motor control        I...
Consequences of Dehydration18        Dehydration:         - Loss of more than 2% of body weight (2-4 pounds)           du...
Heat Exhaustion19        Caused by  body H2O & Na due to         excessive loss of water through sweat         in hot we...
Heat Stroke20        Requires emergency              Body temp. > 105° F         medical care                     - brea...
Signs of Dehydration21        Thirst        Lightheadedness or fatigue        Headache or inability to concentrate     ...
Hyponatremia and Athletes22        Hyponatremia         - Low blood sodium         - Life-threatening condition in marath...
Water Intoxication23        Too much water – hyponatremia         – dilute constituents in blood         - causes imbalan...
Water Intoxication24        Can lead to death        Jennifer Strange         “Hold your wee for a wii”         Drank 2 ...
Upcoming SlideShare
Loading in …5
×

Hlt 230 unit 25

391 views
239 views

Published on

Published in: Health & Medicine
0 Comments
0 Likes
Statistics
Notes
  • Be the first to comment

  • Be the first to like this

No Downloads
Views
Total views
391
On SlideShare
0
From Embeds
0
Number of Embeds
1
Actions
Shares
0
Downloads
1
Comments
0
Likes
0
Embeds 0
No embeds

No notes for slide

Hlt 230 unit 25

  1. 1. Unit 25 Water1
  2. 2. Water2  50-65% of total body weight  Survive 6 weeks or longer without food  Survive only days without water (approx. 6 days)  WATER IS ESSENTIAL!
  3. 3. Functions of Water3  Provide shape and structure to cells  Regulate body temperature  Aids in digestion and absorption  Transports nutrients and oxygen into cells  Eliminate waste products  INVOLVED IN VIRTUALLY EVERY BODY FUNCTION
  4. 4. Water losses4  On average, adults lose approximately 1750 to 3000 mL of water daily  Insensible water losses from the skin and expirations account for approximately ½ of the total water lost  Extreme environmental temperatures, high altitude, low humidity, and strenuous exercise increase insensible losses  Water evaporation from the skin is also increased by prolonged exposure to heated or recirculated air such as during long airplane flights
  5. 5. Water and Fluoride5  Water is a major source of fluoride  Fluoride - formation and maintenance of enamel and resistance to tooth decay  Added to 70% of all municipal water supplies in US  Not removed by filters
  6. 6. Water losses6  Sensible water losses from urine and feces make up the remaining water loss  Because the body needs to excrete a minimum of 500 mL of urine daily to rid itself of metabolic wastes, the minimum daily total fluid output is approximately 1500 mL
  7. 7. Water Intake7  35-55% consumed comes from tap/bottled water  49-63% comes from other beverages  19-25% comes from food
  8. 8. Water in Food8  Fruits and vegetables - made up of 70-90% water  Meats - made up of 50-70% water  Most beverages - made up of more than 85% water
  9. 9. Foods with High water content9  Lettuce  Watermelon  Broccoli  Carrots  Grapes  Tomatoes  Oranges
  10. 10. Bottled vs. Tap Water10  Both are regulated by the FDA  25% of bottled water is actually tap water  “Enhanced” waters are more commercial than nutritional
  11. 11. Plastic Bottles and BPA11  Certain types of plastics contain BPA (bisphenol A)  Softening compound that makes plastic flexible  Released when plastic is heated  Similar shape to estrogen  May be linked to increased risk : - reproductive problems - heart disease - diabetes - behavior changes
  12. 12. How much do we need?12  Men AI = 3.7 L per day (approx. 15 cups) - 3 L coming from water and beverages  Women AI = 2.7 per day (approx. 11 cups) - 2.2 L coming from water and beverages  8 glasses a day??? - most do not consume this amount - no scientific evidence that increased intake increases health
  13. 13. How do we know if we’re getting enough?13  Thirst – poor indicator of hydration status – may be 2-3% dehydrated before you feel it  Urine color – pale yellow – like lemonade
  14. 14. Fluids That Don’t Hydrate14  Fluids with >8% carbohydrates can increase dehydration - can also draw water in the stomach, causing fullness and cramping  Alcoholic beverages are not hydrating - diuretic - *Beer is used after some marathons for CHO  In a sodium-depleted person, water is not hydrating
  15. 15. Carbohydrate and Sodium Contents15
  16. 16. Estimating Fluid Needs During16 Exercise  Sweat rate - Fluid loss per hour of exercise - Sum of body weight loss plus fluid intake  Calculate sweat rate: - Weigh yourself 1 hour before/after workout - Subtract post-workout weight from pre- - 1 pound lost = 16 oz
  17. 17. Inadequate Intake of Water17  Dehydration  Impaired mental function  Impaired motor control  Increased HR  Unresolved dehydration can lead to kidney failure and even death
  18. 18. Consequences of Dehydration18  Dehydration: - Loss of more than 2% of body weight (2-4 pounds) during an event - Impairs performance - Can lead to heat exhaustion or heat stroke
  19. 19. Heat Exhaustion19  Caused by  body H2O & Na due to excessive loss of water through sweat in hot weather  Symptoms: - intense thirst - weakness - paleness - dizziness - nausea - fainting - confusion  Remedy: fluids w/ electrolytes & rest in a cool place
  20. 20. Heat Stroke20  Requires emergency  Body temp. > 105° F medical care - breakdown of  Characterized by: mechanisms that regulate - hot, dry skin body temp. - labored, rapid breathing - rapid pulse  AKA sunstroke - nausea - blurred vision  Caused by prolonged - irrational behavior exposure to environ. heat - coma or strenuous activity
  21. 21. Signs of Dehydration21  Thirst  Lightheadedness or fatigue  Headache or inability to concentrate  Feeling cold or chills in hot weather  Collapse due to heat exhaustion or heat stroke  Producing small amounts of dark-colored urine
  22. 22. Hyponatremia and Athletes22  Hyponatremia - Low blood sodium - Life-threatening condition in marathon runners - Caused by consuming large amounts of water without sodium during an endurance event - Causes difficulty breathing, bloating, confusion, nausea, vomiting, swelling around brain
  23. 23. Water Intoxication23  Too much water – hyponatremia – dilute constituents in blood - causes imbalances of water and electrolytes – rare  Symptoms: - confusion - headache - vomiting - seizure - coma - death
  24. 24. Water Intoxication24  Can lead to death  Jennifer Strange “Hold your wee for a wii” Drank 2 gallons of water Died 6 hours later Video  Radio station was held accountable for her death

×