1. Water Some Review, Some New
Food Science
Ms. McGrath

2. Water – A Summary

3. Water – A Summary

4. Water – A Summary

5. Water – A Summary

6. Water – A Summary

7. Water – A Summary

8. What Does Water Do? Carries nutrients and wastes
Helps for the structure of many large molecules
Participates in metabolism
Solvent for minerals, vitamins, amino acids, glucose, and other small molecules
Lubricates joints
Shock absorber inside eyes, spinal cord, and amniotic sac
Regulates body temperature (sweating to cool the body)
Maintains blood volume (plasma)

9. The Water Molecule H2O – held together by covalent bonds
The two hydrogen atoms share electrons with one oxygen atom, creating chemical stability for all
There is an uneven sharing of the electrons (oxygen atoms pulls the electrons towards itself) causing water molecules to be slightly polar (having a slightly positive end and a slightly negative end)

10. The Water Molecule

11. Water – A Solvent
Water is a good solvent because it is a polar molecule. It will dissolve polar solutes easily.
Remember that “like dissolves like” and water
makes an excellent solvent for the chemical
reactions to occur in your body.

12. Water Balance Balance between water intake and excretion
~ 60% adult body weight
Can only survive a few days without water
Can survive much longer without food

13. Water - Dehydration Reduces body water Excess losses Inadequate intake
Symptoms rapidly progress
Thirst
Weakness
Exhaustion & delirium
Death from heart attack (electrolyte imbalance)

14. Water - Intoxication Rare condition seen with Excess intake
Kidney disorders
Humans don’t store water well, over intake may cause excess water on the lungs and brain.
Symptoms include: headache, muscular weakness, confusion, loss of appetite, convulsions, death

15. Water - Sources Nearly all foods contain water
Fruits and Vegetables – up to 95% water
Meats and Cheese – up to 50% water
Free form of water
Removed easily from food – ex. Orange juice

16. For your notes What is metabolism? What is anabolism?
What is catabolism?
What does DRI stand for?
What does DRI mean?
What is osmosis?