When the blood is too thick, the blood becomes less mobile and more prone to thrombosis or embolic diseases. If you have increased blood viscosity, first of all, you should pay attention to a light diet and avoid eating foods with high sugar, high fat and high calories. At the same time, you should drink more water and green tea, which can effectively reduce blood viscosity and prevent thrombotic diseases. For example, the most effective way to reduce the viscosity of blood caused by true erythrocytosis is to use bloodletting therapy to reduce the number of red blood cells in the body, which can reduce the viscosity of blood and prevent thrombotic diseases. If the blood viscosity is increased due to high blood sugar and high blood fat, the first step is to carry out a low-sugar and low-fat diet. At the same time, insulin and hypoglycemic drugs should be applied to lower blood sugar, and lipid-lowering drugs should be applied to lower blood lipids to prevent thrombotic diseases.