Because people usually rely on sugar metabolism for energy supply, after changing food for 2-3 days, the sugar in the body runs out, and then naturally they start fat metabolism and enter a broken state. The functional order of lipid metabolism is as follows: fat is transported to the liver through blood, cut and metabolized in the liver, and further converted into energy. Therefore, the order of fat metabolism in Yongyutang vegetarian meal replacement is: pre-lipid-visceral fat-subcutaneous fat-protein, and all kinds of garbage in blood and visceral tissues are raw materials for energy conversion.