Development, acceptability and efficacy of a standardized healthy lifestyle intervention in recurrent depression.

BACKGROUND: Research evidence on the effects of integrated multifaceted lifestyle interventions for depression is scanty. The aim of the present study is to report on the development, acceptability and efficacy of a standardized healthy lifestyle intervention, including exercise, eating habits, sleep hygiene and smoking cessation in preventing relapses. METHODS: One hundred-sixty outpatients with recurrent unipolar depression or bipolar disorder were recruited after achieving full remission or recovery from the most recent depressive episode. Patients were randomized to 3-months of usual care or to an intervention aimed at promoting a healthy lifestyle (HLI), as an augmentation of pharmacological maintenance treatment. Usual care consisted of clinical management visits. At the end of the intervention, follow-up visits were scheduled at 3,6,9 and 12 months. RESULTS: During the intervention phase, 1 relapse occurred in the HLI group and 4 in the control group. Over the 12 months of follow-up, relapses were 5 in the HLI group and 16 in control group. Using an intent-to-treat approach, the overall percentage of relapses was 6/81 (7.4%) in the HLI group vs. 20/79 (25.3%) in the control group.. In a Kaplan-Meier survival analysis the risk of relapse was significantly lower in patients receiving the HLI intervention (log-rank test, p=0.003) over the 60 weeks of observation. The majority of patients assigned to HLI adhered to the program, and were highly motivated throughout the intervention. LIMITATIONS: The retention rate was low because patients were recruited during the maintenance phase and the 1-year follow-up was relatively short to detect a long-term effect of HLI. CONCLUSIONS: The HLI program proved to be efficacious in preventing relapses. Given the absence of contraindications and its cost-effectiveness in routine practice, the use of HLI should be encouraged to promote the well-being of patients with recurrent depression.