The special diet of Nanjing Tongrentang is neither medicine nor ordinary health food. This is a special diet for overweight people who need to control their weight. It is very effective to lose weight with it.

Nanjing Tongrentang's special diet is liquid bag diet, and its main component is a kind of Flammulina velutipes composite fiber called FVCP-CBX, which is composed of mushroom chitin, Flammulina velutipes polysaccharide and other fibers.

It can play a significant role in the saturated absorption of oil in the intestine, helping to hinder the absorption of oil by the human body, thus achieving the effect of losing weight and controlling weight. This is the slimming principle of "sucking oil first and then discharging oil" advocated by Nanjing Tongrentang special diet.