The study also includes qualitative interviews. The aim of these studies is to gain understanding of patients' and health professionals' experience and attitudes around food, lifestyle and support functions associated with dietary change. The sampling approach involves the purposeful selection of cases with a wide range of variation, which means that the researcher selects people who are able to provide rich information about the current issue. To achieve diversity, it is useful that both women and men are involved in the studies, as well as people of different ages and with different experiences of providing or receiving dietary advice. About 15-20 people will participate in each interview study.