Usually mentioned in life is increased cholesterol, increased cholesterol can cause thickening of blood lipids and cause cerebral thrombosis to occur.1. However, low cholesterol can also cause diseases. Cholesterol is the raw material for the synthesis of very heavy hormones in the body, especially sex hormones, so severe hypocholesterolemia can cause amenorrhea and other manifestations. 2. Secondly, cholesterol can maintain the stability of cell membranes, and low cholesterol can cause poor stability of cell membranes, leading to increased brittleness of blood vessel walls and causing cerebral hemorrhage. 3. Again, low cholesterol can lower the immunity of the body because cholesterol is an important raw material for steroid hormones in the body 4. Another point is that the lack of cholesterol in infancy and childhood can have an impact on intelligence.