The purpose of the course is to convey to the student the understanding of the chemical reactions at the basis of life. The course provides for the discussion of the fundamental laws of chemical transformations, the concept of structure and molecular organization, spatial orientation, the role of different molecules in the constitution of biological structures, in the cell or organism, the main categories of nutrients and of their value under a proper diet regime. The course aims to provide basic knowledge on the chemistry of living organisms. Such knowledge includes the structure and organization of living matter (structure and function of the main biological macromolecules).