Contents

Preface viii

Additional resources x chapter 1 Why eat? 1

  1. 1 The need for energy 2
  2. 2 Metabolic fuels 4
  3. 3 Hunger and appetite 6

chapter 2 Enzymes and metabolic pathways 15

  1. 1 Chemical reactions: breaking and making covalent bonds 16
  2. 2 Enzymes 19
  3. 3 Factors affecting enzyme activity 23
  4. 4 Coenzymes and prosthetic groups 32
  5. 5 Classification and naming of enzymes 38
  6. 6 Metabolic pathways 39

chapter 3 the role of ATP in metabolism 49

  1. 1 The adenine nucleotides 50
  2. 2 Functions of ATP 50
  3. 3 The phosphorylation of ADP to ATP 60

chapter 4 digestion and absorption 77

  1. 1 The gastrointestinal tract 78
  2. 2 Digestion and absorption of carbohydrates 81
  3. 3 Digestion and absorption of fats 92
  4. 4 Digestion and absorption of proteins 103
  5. 5 The absorption of minerals 111
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