For many years now, our research unit has been involved in projects, partially financed by the Italian Ministry of University and Research (MIUR), geared towards studying the effects induced by dietary changes in patients with calcium stone disease. The aim of the present project is to deepen our knowledge on the relationship between stone disease, hypertension, body weight and water and salt intake both in the general population of the area of Parma, where historically and by gastronomic tradition the normal diet tends to have a high salt content, and in a selected population of stone formers and hypertensives.