Fermentation is an ancient food preparation method that science is rediscovering as a powerful tool for making foods more nutritious and safer to eat. By using specific bacteria and fungi to ferment various foods like soybeans, grains, and vegetables, researchers have found that fermentation increases the availability of vitamins and minerals our bodies can absorb, reduces harmful compounds in foods, and helps preserve them naturally. This technology also offers sustainable solutions by making use of overlooked crops and reducing food waste, all while potentially lowering salt content in traditionally salty foods.