If the symptoms of greasiness appear, the following reasons are mainly considered: first, psychological effects, especially for women, because the diet is relatively light, or for dieting to lose weight, they will psychologically resist, so when they see too greasy food, they will produce nausea; second, consider the existence of liver and gallbladder disease, because fat needs the lipase in bile to digest, if liver and gallbladder disease causes bile If liver and gallbladder diseases lead to abnormal bile secretion, it will affect the digestion and decomposition of fat, which will lead to nausea when eating greasy food. Third, consider early pregnancy reaction. For women who have sex, if there is delayed menstruation with symptoms such as aversion to greasy food, nausea and vomiting, early pregnancy should be considered, and a urine pregnancy test is recommended to clarify this.