Trans fatty acid is a kind of unsaturated fatty acid containing trans non-conjugated double bond structure, which can be divided into natural and industrial types according to the source. Unlike other fats taken from food, TFA is not beneficial to health, nor is it a nutrient required by the human body, and it is hazardous to human health, as excessive consumption may cause disorders in human lipid metabolism and diseases such as atherosclerosis, coronary heart disease and stroke.1. Natural type: Natural type TFA is naturally synthesized in the intestines of ruminants through bacterial biohydrogenation and is found in dairy products and dairy products. and exist in beef and lamb meat and dairy products, and the proportion in the fat of dairy products and ruminant meat does not exceed 5% at the highest, which has less impact on human body after consumption; 2. Industrial type: industrial type TFA is produced by partially hydrogenating and deodorizing vegetable oil and heating vegetable oil under high temperature conditions, so hydrogenated vegetable oil is the main source of industrial TFA. Compared to common vegetable oils, hydrogenated vegetable oils are chosen by most manufacturers for their greater stability, processing functionality and lower cost. Therefore, foods that contain hydrogenated oils or are fried with hydrogenated oils contain TFA, such as Western-style pastries, potato chips, French fries, margarine, coffee mates, pearl milk tea, etc. Compared with the natural type TFA, industrial type TFA has a higher proportion in food, a greater intake by human body, and a more significant health impact. Therefore, it is recommended to eat less high-fat and fried foods, eat more fruits and vegetables, and maintain a balanced diet so as to consume less TFA, which is beneficial to the prevention of lipid-related diseases. If you are already suffering from high blood lipids and cardiovascular diseases, you should reduce the intake of TFA to avoid aggravating the disease.