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Background: Vegetarianism is linked with better physical health, but also to increased anxiety and depression. The aim of the present study is to examine the relationship between vegetarianism and both positive and negative mental health, across cultures and over time.Method: Self-report questionnaire data were obtained from a large-scale multi-national cross-sectional sample including 2007 representative adult members of the German population, 3020 representative adults from Russia, and 3038 representative adults from the USA. Participants for the longitudinal analyses include university students from Germany (1608) and China (12,744). Statistical models included multiple linear regression, longitudinal linear models and longitudinal logistic models.Results: Vegetarianism diet is not reliably related to positive or negative mental health in US and Russian representative samples or in German representative or student samples. Vegetarianism is related to slight increases over time in anxiety and depression in Chinese students.Conclusions: Vegetarianism is not associated with mental health in the US, Russia, or Germany, but is associated with anxiety and depression in China in this study. Future studies should examine the nuances of vegetarianism in more detail and their links with mental health, including dietary composition and cultural beliefs and economic circumstances. Future researchers in this area may also want to consider the effects of experimental manipulation of diet on mental health outcomes over time. [ABSTRACT FROM AUTHOR]

• Meat substitute experience strongly predicts meat reduction intentions in China and US. • Meat substitute experience strongly predicts meat reduction policy support in China and US. • Factual information can increase meat reduction intentions and respective policy support. • Meat substitute experience can potentially boost the positive effect of information. • Strategic policy sequencing can increase support and create positive political feedback. The food system causes more than a third of the global anthropogenic greenhouse gas emissions, of which half are from livestock. Shifting towards plant-based diets could significantly reduce deforestation, protect biodiversity, and contribute to achieving the Sustainable Development Goals and Paris climate targets. Arguably, large-scale shifts in meat consumption require ambitious policy change. Yet, deep-rooted eating habits, pleasure, cultural status, and personal freedom are just a few of many obstacles to adopt ambitious demand-side policies and reduce meat consumption. Here, we hypothesize that technological innovation in meat substitutes, if effectively combined with social norm and factual informational triggers for behavioral changes, can foster positive political feedback to transform the food system. To test our hypothesis, we conducted survey experiments with citizens (N = 2590) in China and the US – the globally largest meat markets – and analyzed data using different machine learning methods. Our findings show that personal experience with novel plant-based meat substitutes strongly predicts individuals' intentions to reduce their meat consumption, eat more substitutes, and support public policies to catalyze a transition to more plant-based diets. We also find that in both countries factual and social norm information about the benefits of more plant-based diets can increase citizens' behavioral change intentions and support for meat reduction policies. Overall, however, social norm information had no significant additional effects on the outcomes compared to the simple factual information treatments. In the US, prior experience with innovative meat substitutes potentially can boost the positive effects of informational campaigns on public support for meat reduction policies. The results offer promising implications for a policy sequencing strategy to create positive political feedback and enable socio-technical tipping dynamics for sustainable food system transformation. [ABSTRACT FROM AUTHOR]