Effects of physical activity and nutrient supplementation on symptoms and well-being of schizophrenia patients: An umbrella review.

Background: Physical activity and nutrient supplementation have been acknowledged to have moderate effects on symptoms and treatment compliance of patients suffering from mental disorders. However, there is still a lack of consensus on whether these interventions are effective on schizophrenia clinical and quality of life outcomes. Our objective was to provide a comprehensive review of systematic reviews that addressed the effects of physical activity and nutrient supplementation on treatment compliance, symptoms and improving the well-being of patients with schizophrenia.

Method: We carried out an umbrella review following Johanna Briggs Institute methodological guidance as follows: 1) Formulating a review question, 2) developing a search strategy, 3) systematic search in scientific databases (Medline, Cochrane Library, Science Direct), 4) study selection (title, abstract and full-text screening), 5) data extraction, 6) data charting and synthesis and 7) quality appraisal.

Results: Our search strategy yielded 2214 articles published between 1960 and 2023. Nine systematic reviews fitted our inclusion criteria. Our umbrella review suggests that yoga is effective on positive and negative symptoms, and well-being, whereas aerobics is only effective on positive symptoms. We also found that supplementing polyunsaturated fatty acids and trace elements reduced schizophrenia's negative symptoms.

Conclusion: Our umbrella review highlighted moderate to low-quality evidence supporting the effectiveness of physical activity on negative and positive schizophrenia symptoms and the overall well-being of patients with schizophrenia. Our review findings support the need to promote physical activity and supplementation of micronutrients, a cost-effective strategy to promote healthy lifestyles in low and middle-income countries.