Fermentation is the natural process by which friendly yeasts and bacteria metabolise the carbohydrates in food. Nutrients such as enzymes, vitamins and minerals are boosted and become easier to digest and complex flavours are developed.
Not only that, but the presence of these live organisms are probiotic and contribute to the diversity of gut bacteria (gut microbiome). This matters because studies now show what tradition has long believed, that gut health has a direct effect on our general health and well-being.
In short, fermented foods are more digestible, more delicious and more nutritious than the raw ingredients they are made from.