Diet-focused depression therapy showed no clear extra climate benefit
Among Australian adults in a depression-treatment trial, lifestyle therapy did not clearly outperform psychotherapy on estimated dietary climate impact. This uncertain result does not establish that their environmental effects were equivalent.
Based on the published abstract. The full paper may contain additional methods, results and limitations.
The 30-second takeaway
Over 8 weeks, lifestyle therapy encouraging a Mediterranean-style diet did not show a clear advantage over psychotherapy in reducing the estimated climate impact of participants’ reported diets. Neither group showed a statistically significant overall change. Results for individual food groups were mixed, so the analysis provides an uncertain overall environmental result rather than evidence of identical effects.
This secondary analysis used self-reported dietary intake and complete cases. The abstract does not report environmental outcomes beyond the treatment period or establish that the groups had equivalent dietary climate effects.
What researchers found
Estimated total dietary global warming potential
Lifestyle therapy versus psychotherapy, from baseline to 8 weeks; the between-group difference in percentage change was not statistically significant.
What the environmental score represents
Researchers converted dietary questionnaire responses into global warming potential scores, estimates of food intake’s climate impact. They examined the whole diet and separate food groups. These were calculated dietary indicators, rather than direct measurements of environmental emissions.
Why the treatment question matters
The parent trial concerned depression treatment. This analysis asked whether its lifestyle approach also offered an environmental advantage. A result concerning depressive symptoms does not answer that separate question, and the environmental advantage remained unclear.
The original publication
Environmental co-benefits of a Mediterranean-style dietary intervention for reducing depressive symptoms in adults: results from the Curbing Anxiety and Depression using Lifestyle Medicine randomised controlled trial.
Turner M, Ashtree DN, Lane MM et al.
Br J Nutr · 2025
- PubMed ID
- 40678916
- Record checked
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