Background and aim: Compared with the general population, people with mental illness are at higher risk of developing type 2 diabetes due to poor diet, medication and inactive lifestyle. People with mental illness and members of the general population are equally interested in health behaviour change, but those with mental illness experience communication barriers with professionals. The study aimed to explore philosophies that social care and healthcare professionals apply to health promotion activities targeting people with mental illness and challenges they face in applying these philosophies across multiple settings.Methods: Qualitative interviews were conducted with 18 social and healthcare professionals in a range of settings in 2016-2019. Descriptive qualitative analysis was applied to interview data.Results: Interviewees faced many structural challenges in the organisation of their work, which did not coincide with their philosophy or intentions in relation to health promotion. Three philosophical categories were identified: (a) health promotion approach, (b) elements of care and (c) social relations. Many interviewees intended to apply philosophies of broadly defined health, dialogue-based health education, and incremental approaches to health behaviour change. They wanted to provide holistic and flexible care and they valued peer-to-peer activities, family and friend involvement in care and a trusting relationship between the professional and the person with mental illness. However, rigid structures determining the organisation of health promotion challenged professionals' ability to follow their philosophical intentions.
Conclusion:Interviewees aspired to a collaborative, empowering and personcentred approach, but practical and structural factors made this difficult to achieve in practice. Major changes are required at the organisational level, implemented with the active involvement of professionals and people with mental illness.