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Chapter 5 Water Nutrition. Professor. Dr. Jin BQ Department of Food Science & Nutrition NJNU. §1 Introduction. 1 Concept As a nutrient Controlling the body temperature Adjusting the pH value Joining in the metabolism. 2 Ratio in body. Adults: 50-65% Infants: 70-75% Muscle: 80%.

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chapter 5 water nutrition

Chapter 5 Water Nutrition

Professor. Dr. Jin BQ

Department of Food Science & Nutrition

NJNU

1 introduction
§1 Introduction

1 Concept

  • As a nutrient
  • Controlling the body temperature
  • Adjusting the pH value
  • Joining in the metabolism
2 ratio in body
2 Ratio in body
  • Adults: 50-65%
  • Infants: 70-75%
  • Muscle: 80%
3 the syndrome of water lose
3 The Syndrome of water Lose
  • Thirst: 1% lost (feel to drink)
  • Dehydrated 10%, function lower
  • Dehydrated 20%, to death
2 sources excretion
§2 Sources & Excretion

1 Sources

2.1 Food

2.2 Drink

2. 3 Metabolism in body

MW(g)=0.4prot.(g)+0.6CH2O(g)+ 1.07fat(g)

2 Excretion: Urine, Feces, Sweat, Respiration

3 Requirement : Adults - 1.5L/d.p

3 stable control of liquid
§3 Stable Control of Liquid

1 Kidney: Water maintaining

2 Hypothalamus: Water Intake - ADH lost> 2%

3 Water balance

4 Short of water

5 Environment such as air temperature

4 dielectrics
§4 Dielectrics

1 NaCl

2 K+