The intervention consists of 8 nursing consultations with a mental health nurse trained in healthy habits for individuals with psychosis. During the first 2 months, 4 consultations will focus on dietary habits based on the carbohydrate-insulin theory and physical activity, following a guide developed by experts, incorporating recommendations from the American Diabetes Association. Visits 5 and 6 occur at 3 and 4 months; visit 7 at 6 months to evaluate effectiveness, and visit 8 at 12 months. Weight will be monitored throughout. Assessments at baseline, 6, and 12 months will include labs, vital signs, and scales for psychopathology, quality of life, and activity level. Each session covers key topics, from intervention goals to diet tips and physical activity. The approach is flexible, aiming for gradual habit integration, supported by a therapeutic relationship. Phone reminders will enhance adherence.

Ccontrol group will continue their usual follow-up within the EIP, attending consultations with their reference psychiatrist and receiving pharmacological or psychotherapeutic treatment as they did before the intervention. The control group will not receive any specific nursing consultations (beyond the administration of long-acting injectable antipsychotics where appropriate) or dietary or lifestyle advice during the follow-up. If patients in the control group require treatment or assistance for metabolic problems, they will be referred to primary care or endocrinology professionals, as was done previous to the intervention implementation.

Based on the Carbohydrate-insulin Theory

Weight in kilograms

According to the International Diabetes Federation (IDF)

measured using PANSS scale