Lipid testing is strongly influenced by diet, which means that it is also influenced by fasting time. If fatty foods are eaten, celiac particles will appear in the blood and triglyceride levels will also increase significantly (highest 2 hours after meal), which is a normal physiological phenomenon, and triglyceride levels can be several times or more than ten times as high as fasting at this time, and can be maintained for 6-8 hours, and slowly return to the original fasting level only after 12 hours or more. Eating sugars such as rice, steamed buns and pastries can also cause changes in lipid and lipoprotein content, but the degree of change is not as obvious as that of fat. Specific practice: fasting (including snacks) from 7 pm the day before the blood collection, you can drink a small amount of water, and the next morning between 7-9 is best for blood collection.