This is because: ① Linseed oil contains a large amount of α -linolenic acid, which is an essential fatty acid, and can only be absorbed from food. It has the functions of lowering total cholesterol and removing triglycerides, which can reduce the incidence of hyperlipidemia. ② EPA, a derivative of α -linolenic acid, can prevent the interaction between platelets and arterial wall, inhibit platelet aggregation, reduce arterial thrombosis and reduce blood lipid, which is very effective in preventing coronary heart disease and atherosclerosis. ③ α -linolenic acid belongs to ω-3 unsaturated fatty acid, which can inhibit atherosclerosis, protect ischemic myocardium, reduce necrotic area and maintain the normal function of platelets. ④ω-3 unsaturated fatty acids can also increase high-density lipoprotein, inhibit cell uptake and accumulation of low-density lipoprotein cholesterol, and exclude cholesterol accumulated in cells.