ABSTRACT: In the present paper it is reported a full description of the model of the magnetic site exchange, as well as of the relations that, in the different limit conditions, allow the analysis and the physical interpretation of the relaxation curves as measured for water protons in food systems. It will be hereafter demonstrated that a correct measurement and analysis of both the longitudinal and transversal relaxation curves are likely to provide information on the morphology, size and distribution of the diffusive domains, and also on the physical-chemical parameters of the exchange processes involved
