Why eat? -- Enzymes and metabolic pathways -- The role of ATP in metabolism -- Digestion and absorption -- Energy nutrition: the metabolism of carbohydrates and fats -- Diet and health: nutrition and chronic non-communicable diseases -- Overweight and obesity -- Protein-energy malnutrition: problems of undernutrition -- Protein nutrition and metabolism -- The integration and control of metabolism -- Micronutrients: the vitamins and minerals