Hello, konjac flour is low in calories. You can lose weight by meal replacement, but it has relatively little nutrition. The reasons are as follows: 1 and KM, as soluble dietary fibers, can form a protective layer around food, thus preventing the interaction between digestive enzymes and food. 2.KM can absorb water and swell (80- 100 times) when eating, which suppresses appetite, produces satiety and reduces food intake. 3.KM can delay and prevent the absorption of nutrients such as cholesterol and monosaccharide.