One-year efficacy of the LIFESTYLE intervention in improving diet, physical activity and reducing alcohol use in overweight people with severe mental illness: multicentre randomised controlled trial

Background Unhealthy eating patterns, physical inactivity and alcohol misuse are commonly reported by individuals with severe mental illness (SMI) and significantly contribute to premature mortality. People with SMI could benefit from psychoeducational interventions focused on lifestyle modification. Aims To evaluate the effectiveness of the LIFESTYLE programme to improve dietary habits and physical activity levels and reduce alcohol use in individuals with SMI versus controls receiving a less structured psychoeducational programme (Italian Ministry of University and Research, trial registration number: 2015C7374S). Method This multicentre randomised controlled trial (RCT) was conducted across six Italian universities and included 401 participants diagnosed with SMI, randomly allocated to either the test group or a comparison group. Results At 1-year follow-up, generalised estimating equations showed that the trial intervention boosted the likelihood of higher weekly metabolic equivalents of task (METs) expended on total activity (odds ratio 1.43, 95% CI 1.08–1.89; p < 0.01), on walking (odds ratio 1.50, 95% CI 1.18–1.90; p < 0.001) and on moderate activity (odds ratio 1.85, 95% CI 1.24–2.77; p < 0.01). Improvements in dietary habits included increased intake of fish (odds ratio 1.67, 95% CI 1.45–1.97; p < 0.05), fresh fruit (odds ratio 1.36, 95% CI 1.05–1.76; p < 0.05) and vegetables (odds ratio 1.91, 95% CI 1.56–1.96; p < 0.05), along with reduced junk food consumption (OR = 0.81, 95% CI 0.63–0.99; p < 0.05) and daily alcohol use (odds ratio 0.70, 95% CI 0.52–0.95; p < 0.05). Conclusions The LIFESTYLE intervention proved effective in promoting healthier lifestyles among individuals with SMI, with sustained benefits at 1 year. This structured programme could be a valuable addition to routine mental healthcare.