I recently had a discussion with a friend who struggles with mental health, and that friend was planning to try a more plant-based diet (or even a totally plant-based diet) in an attempt to improve their mental health.

Have there been any studies showing that vegetarian, vegan, or plant-based diets providing a beneficial effect to people who are living with diminished mental health or mental illness? If yes, which diet patterns have been shown to be more or less effective?

I'm looking for scientific studies, so answers with DOI links are strongly preferred.

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