The main causes of low HDL are poor dietary habits, poor daily living habits and diseases. 1. Poor dietary habits: If you eat food with high sugar and fat content for a long time, excessive sugar and fat intake will easily lead to low HDL and even induce hyperlipidemia. 2. Poor daily habits: usually in the life if the lack of exercise exercise sedentary standing, such as sitting in the office for a long time, easy to affect the metabolism of fat, thus producing low HDL. 3. Disease factors: If there is diabetes, coronary heart disease or hypertension and other diseases, it is easy to affect the body fat metabolism, resulting in low HDL. In normal life, pay attention to appropriate exercise and exercise, and eat a light diet. If the situation of low HDL is more serious, it needs to be treated as soon as possible, so as not to induce cardiovascular and cerebrovascular diseases in the later stage.