The Mediterranean diet is recognised as a healthful dietary pattern and has been extensively associated with chronic disease risk reduction. Similarly, another meta-analysis reported that higher adherence to a Mediterranean diet was associated with a 30% reduced risk for depression, with no evidence for publication bias. Recently, a meta-analysis confirmed that adherence to a ‘healthful’ dietary pattern, comprising higher intakes of fruit and vegetables, fish and whole grains, was associated with a reduced likelihood of depression in adults. Whilst cognisant of the limitations of observational data, these associations are usually observed to be independent of socioeconomic status, education and other potentially confounding variables and not necessarily explained by reverse causality (see, e.g. Although there are many versions of a ‘healthful diet’ in different countries and cultures, the available evidence from observational studies suggests that diets higher in plant foods, such as vegetables, fruits, legumes and whole grains, and lean proteins, including fish, are associated with a reduced risk for depression, whilst dietary patterns that include more processed food and sugary products are associated with an increased risk of depression. There is now extensive observational evidence across countries and age groups supporting the contention that diet quality is a possible risk or protective factor for depression.
#Michael mind project blinded by the light trial#
Trial registrationĪustralia and New Zealand Clinical Trials Register (ANZCTR): ACTRN12612000251820. These results indicate that dietary improvement may provide an efficacious and accessible treatment strategy for the management of this highly prevalent mental disorder, the benefits of which could extend to the management of common co-morbidities. A sensitivity analysis, testing departures from the missing at random (MAR) assumption for dropouts, indicated that the impact of the intervention was robust to violations of MAR assumptions. Remission, defined as a MADRS score <10, was achieved for 32.3% ( n = 10) and 8.0% ( n = 2) of the intervention and control groups, respectively ( χ 2 (1) = 4.84, p = 0.028) number needed to treat (NNT) based on remission scores was 4.1 (95% CI of NNT 2.3–27.8). The dietary support group demonstrated significantly greater improvement between baseline and 12 weeks on the MADRS than the social support control group, t(60.7) = 4.38, p < 0.001, Cohen’s d = –1.16. There were 31 in the diet support group and 25 in the social support control group who had complete data at 12 weeks. Of these, 55 were utilising some form of therapy: 21 were using psychotherapy and pharmacotherapy combined 9 were using exclusively psychotherapy and 25 were using only pharmacotherapy. We assessed 166 individuals for eligibility, of whom 67 were enrolled (diet intervention, n = 33 control, n = 34).
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The robustness of estimates was investigated through sensitivity analyses. Analyses utilised a likelihood-based mixed-effects model repeated measures (MMRM) approach. Secondary outcomes included remission and change of symptoms, mood and anxiety. Depression symptomatology was the primary endpoint, assessed using the Montgomery–Åsberg Depression Rating Scale (MADRS) at 12 weeks. The control condition comprised a social support protocol to the same visit schedule and length. The intervention consisted of seven individual nutritional consulting sessions delivered by a clinical dietician.
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‘SMILES’ was a 12-week, parallel-group, single blind, randomised controlled trial of an adjunctive dietary intervention in the treatment of moderate to severe depression.
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Using a randomised controlled trial design, we aimed to investigate the efficacy of a dietary improvement program for the treatment of major depressive episodes. The possible therapeutic impact of dietary changes on existing mental illness is largely unknown.