Cholesterol is found in high levels in the liver, kidneys, brain and nervous tissue, although the liver is the main organ of synthesis and storage. It is the main raw material for synthesizing physiologically active substances such as adrenocorticotropic hormone and sex hormone, and it is the main component of cell membrane. The normal range is: adults: 2.86-5.98umol/L children: 3.12-5.20mmol/L. Reasons for high cholesterol experts analyze that the main factors that cause cholesterol to rise are: First, genetic factors. According to statistics, every 500 people in about one person suffering from familial hypercholesterolemia, they often premature coronary heart disease.　Dietary factors. People who love to eat meat, animal fluids and fatty foods tend to have elevated cholesterol.　Weight. Surveys show that overweight or obese people have higher cholesterol.　Physical activity. People who do not like sports and labor will have higher cholesterol levels.　Sex and age. Blood cholesterol levels increase with age and are higher in women than in men after the age of 50. Alcohol consumption. Excessive alcohol consumption can damage the liver and heart muscle, cause high blood pressure, and raise triglyceride levels.　Stress. Many studies have proved that prolonged mental stress can cause blood cholesterol to rise. On the other hand, some people tend to eat a lot of high-fat food to cope with stress, which is also an important factor in the increase of blood cholesterol. Since 70% of blood cholesterol is mainly synthesized by the liver and 30% comes from food, you can lower your cholesterol by adjusting your diet and eating more light, low-fat, low-cholesterol foods: fish, green vegetables, soy products, and so on. If the total cholesterol still continues not to drop for a period of time after the diet change, usually around three or four days, you should consider whether you have hyperlipidemia, and you should go to the hospital in time for examination, and the doctor will formulate a lipid-lowering program based on your lab results to actively and effectively control the blood lipid level and prevent heart, kidney, and cerebral and cardiovascular complications caused by atherosclerosis. People with high cholesterol should maintain a balanced distribution of calories in their diet, should not overdo it with hunger and fullness, do not favor one food over another, and avoid overeating or stuffing meals. Should eat more low sterol content and nutrient-rich foods, such as fish, fiber-rich foods, soy products, vitamin C. Prohibit the eating of animal offal, egg yolks, cuttlefish, beef and mutton and other red meats and liver, mussels and other foods containing high cholesterol. 1. corn: rich in calcium, magnesium, selenium and other substances, as well as lecithin, linoleic acid, vitamin E, which is very good for the lowering of blood serum cholesterol. 2. a variety of Vegetables: such as konjac, fungus, kelp, wakame, onion, pumpkin, groundnut, etc. These foods are rich in dietary fiber to help the excretion of cholesterol. 3. oats: extremely rich in linoleic acid, vitamin E and saponins. They all have the effect of lowering plasma cholesterol concentration.4. Soybean: rich in unsaturated lipoproteins, vitamin E and phospholipids. High cholesterol patients consume soy protein every day on the recovery of the disease has a very good effect. 5. Fish: especially salmon and tuna fish containing omega-3 fatty acids, with cholesterol-lowering effect. It is recommended to eat two to three times a week fish instead of meat. 6. Milk: contains hydroxyl, methylglutaric acid, can inhibit the activity of cholesterol synthase in the body, thereby inhibiting cholesterol synthesis, reduce blood cholesterol content.