Rice bran (komenuka) is produced as a by-product when brown rice is polished into white rice. In Japan, where rice is a dietary staple, large amounts of rice bran are generated during milling. While some is used for rice oil extraction or fertilizer, a significant portion is still discarded, making effective reuse important for reducing environmental impact.
Traditionally, rice bran has also played a role in Japanese food culture through nukazuke — vegetables pickled in a bed of fermented rice bran (nukadoko). This fermentation, driven by lactic acid bacteria, enhances flavor and is believed to support gut health, immunity, and even beauty. Rice bran itself contains valuable components such as γ-oryzanol, vitamins, and ceramides. It has even been said in Japan that the hands of those who prepare nukazuke remain especially smooth and beautiful.
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