An overview on ethnic fermented food and beverages of India: Interplay of microbes, immunity and nutrition.

India is a land of diverse food culture and habits and has a plethora of ethnic fermented foods to boast of. Ranging from the north east to the western part of the country and from northern Indian states to the southern tip of the country, fermented ethnic foods have become part of everyday meals and have been able to bridge nutritional gaps and improve general immunity of the people. Most ethnic fermented foods have a rich content of protein, vitamins, fibres and minerals. : Our review attempts to bring forth and summarise the most popular, immune boosting fermented foods of various regions in India, the role microbes' play in their making and how they have impacted the nutritional aspects and immunity of people in various regions of the country. It also highlights the lack of clinical findings in proving the effectiveness of most fermented foods. Pubmed central and Google scholar were extensively searched from inception to July 2021 for study concepts and topic related keywords. Ethnic fermented food of various Indian regions has shown a definitive role in improving health and immunity. The diverse ethnic fermented foods maybe be meat based, cereal based, pulses based and even vegetable based. Their health benefits and immune boosting abilities are still to be explored to its maximum potential. Often the role of microbes in these fermented foods have also been underplayed and left unexplored.