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Does reverse causality explain the relationship between diet and depression?

Felice N Jacka1, Nicolas Cherbuin2, Kaarin J Anstey2

  • 1IMPACT Strategic Research Centre, Deakin University, Geelong, Australia; Centre for Adolescent Health, Murdoch Children׳s Research Institute, Melbourne, Australia; Department of Psychiatry, The University of Melbourne, Melbourne, Australia; Black Dog Institute, Sydney, Australia.

Journal of Affective Disorders
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While current depression links to poor diet, a history of depression may encourage healthier eating habits long-term. This suggests diet quality can improve with past depression, benefiting mental health.

Keywords:
CausalityDepressionDietPrevention

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Area of Science:

  • Nutritional Psychiatry
  • Mental Health Research
  • Epidemiology

Background:

  • Established links exist between habitual diet quality and depression.
  • The complex, bidirectional relationship between diet and depression warrants further investigation, particularly regarding reverse causality.

Purpose of the Study:

  • To investigate the reverse causality hypothesis in the diet-depression relationship.
  • To examine how past depression and its treatment influence current dietary patterns.

Main Methods:

  • Utilized data from the Personality and Total Health (PATH) Through Life Study, a longitudinal Australian community survey.
  • Analyzed relationships between past depression, treatment history, current depressive symptoms, and dietary patterns across three age cohorts.

Main Results:

  • Individuals with current depression exhibited lower adherence to healthy dietary patterns.
  • Those with a history of depression, especially if treated, showed higher adherence to healthy diets at a later assessment.
  • Prior depression, irrespective of treatment, was associated with reduced consumption of Western dietary patterns.

Conclusions:

  • Current depression correlates with poorer dietary habits, whereas a history of depression may lead to healthier long-term dietary choices.
  • Clinicians should encourage dietary improvements for patients with depression, as adherence is likely.
  • Findings suggest a potential positive feedback loop where past depression influences future dietary behavior.