Protein-Calorie Malnutrition Viewed as a Challenge for Homeostasis -- Outline of WHO and PAG Participation in Research on Protein-Calorie Malnutrition -- Enzymes and Nutrition -- Factors Which May Affect the Biochemical Response to Protein-Calorie Malnutrition -- Proposed Methodology for the Biochemical Evaluation of Protein Malnutrition in Children -- Has Malnutrition Only Bad Consequences ? What is the Definition of Health ? -- Observations on Protein-Calorie Malnutrition in the Caribbean -- Amino-Acid Imbalances: What is their Significance in Relation to Protein Deficiency ? -- Observations on Some Epidemiological Factors and Biochemical Features of Protein-Calorie Malnutrition -- Single Cell Proteins: Basic Aspects and Future Trends -- The Discussion -- Food Composition Tables of the Important Foodplants Used in West Africa -- References.