Konjac, a food derived from the konjac plant (also known as bitter yam), is becoming a popular choice in weight-loss diets due to its ability to support effective weight reduction without causing hunger. The main component of konjac is glucomannan fiber, which can absorb up to 50 times its weight in water, forming a gel-like mass in the stomach that helps you feel full for longer. This is especially beneficial for those who want to lose weight but are concerned about eating less.