Definition and content of biochemistry,functions and importance of biological water, Acids and bases, pH concept, importance, buffer systems,amino acids, structure and classification, three-dimensional structures of proteins, biological importance, classification of enzymes, enzyme regulation,functions and coenzyme, carbohydrates, definitions of proteins and amino acids and their metabolism,functions of enzymes and hormones here, nucleic acids, purine and pyrimidine metabolism. biochemical foundations of nutritional science, using basic biochemistry information, the biochemical connections between gender,age, special condition, disease, exercise and dietary fuels, nutrients, non-nutrient dietary components and different dietary practices in different environments are examined.