The average American is likely unfamiliar with konjac root, but it has been a popular ingredient in Asia for centuries. Konjac root contains high levels of glucomannan fiber, a highly viscous dietary fiber that many experts consider a prebiotic. Glucomannan, like other prebiotics, promotes the growth of healthy bacteria in the gut. It may also help with and improve carbohydrate metabolism.
In Japanese cuisine, konjac root is widely available in noodle-like strips that are perfect for udon and sukiyaki. It is also available as a jelly, and many vegans use it as an alternative to gelatin. Some cultures grind the root into flour and use it to create different types of noodles.