Fermented Foods in Canada: A Perspective on Research Evidence, Policy, and Future Priorities.

Fermented foods are attracting renewed scientific, public, and policy interest due to their appealing sensory qualities and their potential health benefits, particularly in light of emerging research on microbiome-diet interactions and food-derived bioactive compounds. Despite their long history of consumption and cultural significance, fermented foods remain largely absent from national dietary guidance in Canada. Although emerging evidence suggests fermented foods may contribute to health, important uncertainties remain regarding mechanisms of action, product-specific effects, and the strength of evidence across health outcomes. This perspective synthesizes insights from the inaugural workshop of the Canadian Fermented Foods Initiative, integrating viewpoints from microbiology, nutrition, clinical research, policy, industry, and patient partners. We argue that progress in this field requires moving beyond broad, category-level claims toward mechanism-informed, well-characterized research that reflects the biological and cultural diversity of fermented foods. Drawing on both the published literature and workshop discussions key priorities are identified, including improved characterization of fermented food interventions, clearer alignment between evidence generation and regulatory standards, and greater integration of culturally grounded research approaches. Workshop discussions highlighted the potential value of complementary study designs, including pragmatic trials and citizen science approaches, for evaluating fermented foods within real-world dietary patterns, although their role in future dietary guidance frameworks remains to be established. Finally, we outline a coordinated national pathway to strengthen the evidence base, support responsible science communication, and facilitate the credible integration of fermented foods into dietary guidance and public health strategies.