Background Clients with severe mental illness (SMI) have overall poor physical health. SMI reduces life expectancy by 5–17 years, primarily due to physical comorbidity linked to cardiometabolic risks that are mainly driven
by unhealthy lifestyle behaviours. To improve physical health in clients with SMI, key elements are systematic somatic screening and lifestyle promotion. The nurse-led GILL eHealth was developed for somatic screening and the imple‑
mentation of lifestyle activities in clients with SMI. Aims of this study are to evaluate the efectiveness of the GILL eHealth intervention in clients with SMI compared to usual care, and to evaluate the implementation process,
and the experiences of clients and healthcare providers with GILL eHealth.
Methods The GILL study encompasses a cluster-randomised controlled trial in approximately 20 mental health care facilities in the Netherlands. The randomisation takes place at the team level, assigning clients to the eHealth inter‑
vention or the usual care group. The GILL eHealth intervention consists of two complementary modules for somatic screening and lifestyle promotion, resulting in personalised somatic treatment and lifestyle plans. Trained mental
health nurses and nurse practitioners will implement the intervention within the multidisciplinary treatment context, and will guide and support the participants in promoting their physical health, including cardiometabolic risk
management. Usual care includes treatment as currently delivered, with national guidelines as frame of reference. We aim to include 258 clients with SMI and a BMI of 27 or higher. Primary outcome is the metabolic syndrome severity
score. Secondary outcomes are physical health measurements and participants’ reports on physical activity, perceived lifestyle behaviours, quality of life, recovery, psychosocial functioning, and health-related self-efcacy. Measurements
will be completed at baseline and at 6 and 12 months. A qualitative process evaluation will be conducted alongside, to evaluate the process of implementation and the experiences of clients and healthcare professionals with GILL
Discussion The GILL eHealth intervention is expected to be more efective than usual care in improving physical health and lifestyle behaviours among clients with SMI. It will also provide important information on implementation
of GILL eHealth in mental health care. If proven efective, GILL eHealth ofers a clinically useful tool to improve physical health and lifestyle behaviours.