Chapter 7:    ProteinsCopyright © 2012-2016 Marshall Cavendish International (Singapore) Pte Ltd02 January 2012.
Learning Outcomes   By the end of this chapter, you will be able to:   •State the functions of proteins;   •State the elem...
Learning Outcomes   By the end of this chapter, you will be able to:   •List the sources of animal and plant proteins;   •...
Functions of proteins       •       Source of energy       •       Growth, repair &               maintenance of body     ...
Elements of a protein molecule       Carbon (C), hydrogen (H) &       Oxygen (O)       •Some contain phosphorous (P) &    ...
Types of amino acids           Essential amino acids           •Body cannot produce, get           from food              ...
Sources of proteins       Animal source       •Meat, seafood,       dairy products       Plant source       •Pulses       ...
Types of proteins   High biological protein   •Contains all the essential amino acids   Low biological protein   •Lacks on...
Recommended daily intake of     proteins     •2-3 servings (Healthy Diet Pyramid)     •0.8g protein per kg (Body weight)Co...
Effects of insufficient protein                            intake     Protein-energy malnutrition (PEM)     Marasmus (6-18...
Effects of insufficient protein                            intake     Protein-energy malnutrition (PEM)     Kwashiorkor (1...
Effects of excessive protein intake     •Extra stress on liver and kidney     •Higher risk of getting obesity, type 2 diab...
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Fm chapter 07 (1)

  1. 1. Chapter 7: ProteinsCopyright © 2012-2016 Marshall Cavendish International (Singapore) Pte Ltd02 January 2012.
  2. 2. Learning Outcomes By the end of this chapter, you will be able to: •State the functions of proteins; •State the elements of a protein molecule; •Differentiate between dispensable and indispensable amino acids; •Differentiate between proteins of high and low biological value;Copyright © 2012-2016 Marshall Cavendish International (Singapore) Pte Ltd02 January 2012.
  3. 3. Learning Outcomes By the end of this chapter, you will be able to: •List the sources of animal and plant proteins; •State the daily recommended protein intake; •Explain the health problems related to excessive/ insufficient protein intake;Copyright © 2012-2016 Marshall Cavendish International (Singapore) Pte Ltd02 January 2012.
  4. 4. Functions of proteins • Source of energy • Growth, repair & maintenance of body cells • Formation of enzymes • Maintain healthy immune systemCopyright © 2012-2016 Marshall Cavendish International (Singapore) Pte Ltd02 January 2012.
  5. 5. Elements of a protein molecule Carbon (C), hydrogen (H) & Oxygen (O) •Some contain phosphorous (P) & sulphur (S) Amino Acids •Basic unit of proteins (total 22) Peptide •2 amino acids combine together Peptide bond •Bond between 2 amino acids Polypeptide •3 or more amino acids linked by peptide bondCopyright © 2012-2016 Marshall Cavendish International (Singapore) Pte Ltd02 January 2012.
  6. 6. Types of amino acids Essential amino acids •Body cannot produce, get from food PVT TIM HALL •10 for children, 8 for adults Non-essential amino acids •Body can produce, no need to get from foodCopyright © 2012-2016 Marshall Cavendish International (Singapore) Pte Ltd02 January 2012.
  7. 7. Sources of proteins Animal source •Meat, seafood, dairy products Plant source •Pulses •Legumes •NutsCopyright © 2012-2016 Marshall Cavendish International (Singapore) Pte Ltd02 January 2012.
  8. 8. Types of proteins High biological protein •Contains all the essential amino acids Low biological protein •Lacks one or more essential amino acids Complementary protein •Protein content of one food compensates another’s deficiencyCopyright © 2012-2016 Marshall Cavendish International (Singapore) Pte Ltd02 January 2012.
  9. 9. Recommended daily intake of proteins •2-3 servings (Healthy Diet Pyramid) •0.8g protein per kg (Body weight)Copyright © 2012-2016 Marshall Cavendish International (Singapore) Pte Ltd02 January 2012.
  10. 10. Effects of insufficient protein intake Protein-energy malnutrition (PEM) Marasmus (6-18 months)Copyright © 2012-2016 Marshall Cavendish International (Singapore) Pte Ltd02 January 2012.
  11. 11. Effects of insufficient protein intake Protein-energy malnutrition (PEM) Kwashiorkor (18-24 months)Copyright © 2012-2016 Marshall Cavendish International (Singapore) Pte Ltd02 January 2012.
  12. 12. Effects of excessive protein intake •Extra stress on liver and kidney •Higher risk of getting obesity, type 2 diabetes, high blood pressure & heart attackCopyright © 2012-2016 Marshall Cavendish International (Singapore) Pte Ltd02 January 2012.

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