Is glucomannan keto?

Yes. The fiber from konjac root that makes shirataki noodles. It thickens in tiny amounts and is almost all fiber.

Fiber: subtract it. It is fiber, so subtract it from total carbs like any other fiber.

Glucomannan absorbs many times its weight in water, which is how shirataki noodles are made and why a pinch thickens a sauce. It is nearly all fiber and adds almost no net carbs.

glucomannan, konjac, konjac flour, konjac root, konjac powder, konjac gum, konnyaku.