Konjac tofu is not a bean product, konjac is a root, and most bean products are fruits. Konjac is a perennial herb of Araceae. The earliest written records of China can be found in Er Ya, an ancient book in the pre-Qin period. Amorphophallus konjac can't be eaten directly after being dug out of the ground, so it needs to be processed. This kind of konjac tofu is one of the processing forms. There is a substance in konjac flour, which will swell dozens to hundreds of times under certain conditions, and it is not fat after eating.