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The SMILES trial: do undisclosed recruitment practices explain the remarkably large effect?
Marc L Molendijk1,2, Eiko I Fried3,4, Willem Van der Does3,5,6
1Institute of Psychology, Clinical Psychology Unit, Leiden University, Leiden, The Netherlands. molendijkml@fsw.leidenuniv.nl.
BMC Medicine
|December 29, 2018
Summary
The SMILES trial found that healthy dieting consultations significantly improved depressive symptoms. Researchers suggest that patient expectations and lack of blinding may have influenced these remarkable depression reduction results.
Area of Science:
- Nutritional Psychiatry
- Clinical Psychology
- Behavioral Medicine
Background:
- The SMILES trial investigated the impact of dietary interventions on mental health.
- Depression is a significant public health concern with various treatment modalities.
- Dietary patterns are increasingly recognized for their role in mental well-being.
Discussion:
- The substantial improvement in depressive symptoms observed in the SMILES trial warrants further investigation.
- The large effect size for depression reduction suggests potential confounding factors.
- Selective expectancy induction and loss of blinding are proposed as contributors to the observed outcomes.
Key Insights:
- Seven consultations on healthy dieting led to significant reductions in depressive symptoms.
- The magnitude of the effect size in depression reduction was notably large.
- Potential biases, including induced expectancy and unblinding, may have influenced the trial's results.
Outlook:
- Future research should aim to replicate these findings with rigorous blinding protocols.
- Investigating the specific mechanisms through which diet impacts depression is crucial.
- Understanding the role of expectancy in dietary interventions can inform clinical practice.
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