Traditional Asian Fermented Foods: Classification, Microbiological Insights, Health Benefits, and Modern Quality Dynamics

Fermentation has long been used to preserve foods and develop distinctive sensory characteristics across Asia. This review examines the classification, microbial characteristics, nutritional and health-related attributes, and contemporary safety and quality considerations of traditional Asian fermented foods. Animal-based products, including fermented meat and fish, are distinguished from plant-based products prepared from cereals, soybeans, vegetables, and tea leaves. The discussion focuses particularly on fermented tea products, such as Laphet from Myanmar and Miang from Thailand, and fermented bamboo shoot products, including Soibum and Soidon from Northeast India. Lactic acid bacteria, yeasts, and moulds contribute to fermentation through acid production, substrate breakdown, and the formation of compounds associated with flavour and preservation. Depending on the food substrate and processing conditions, fermentation may improve digestibility, reduce certain antinutritional compounds, and alter the availability of bioactive constituents. These changes, however, do not establish clinical benefits for all fermented products, and human evidence remains limited for several proposed health outcomes. Food safety and product consistency also depend on suitable raw materials, hygienic handling, fermentation conditions, and storage practices. The review highlights the value of traditional knowledge while recognising the role of controlled fermentation and quality management in supporting the continued production of these culturally important foods. Further product-specific evaluation is needed before broad nutritional or health-related claims can be established.