Psychotic patients have poorer health behaviours, including poor diets and sedentary lifestyles increasing their risk for obesity, diabetes, hypertension, and dyslipidaemia, and tend to have a shorter life expectancy as compared to nonpsychiatric populations. Lifestyle intervention programmes that target modifiable risk factors in such patients have produced uneven results. The objective was to evaluate the efficacy of a package of health promotion strategies to improve diet and physical exercise in psychotic patients. Our hypothesis was that a pre- to post-treatment improvement in physical activity and dietary habits would occur in the group receiving intervention.

This randomised controlled trial was carried out in four psychiatric services. The intervention included psychoeducation sessions on diet and physical activity and regular participation in walking groups (experimental group). The control group received routine treatment. The primary outcome was an improvement of at least one World Health Organization recommendation on diet and exercise.

Of a total of 326 subjects recruited, 169 were randomly assigned to the experimental group and 157 to the control group. An improvement in one or more World Health Organization criteria over baseline was observed in 25.4% of experimental group subjects and in 12.2% of control group subjects (odds ratio 2.46, 95% confidence interval 1.22–4.97; p = 0.01).

A statistically significant proportion of the sample achieved post-treatment improvement in lifestyle habits, especially as regarded increased physical activity. A post-intervention reduction in lifestyle variability was also noted. Interventions directly addressing dietary habits may be desirable in psychotic patients.