Trans fatty acids is a general term for unsaturated fatty acids that contain a trans non-conjugated double bond structure. They are mainly found in hydrogenated vegetable oils, refined vegetable oils, and in the adipose tissue and milk of certain ruminants. Trans fatty acids is a generic term for a variety of unsaturated fatty acids that are often found in processed oils. Hydrogenated vegetable oils are the most important food source of trans fatty acids, which are produced when unsaturated fatty acid-based vegetable oils undergo special processing to transform them from liquid to solid and semi-solid unsaturated fats. In addition to this, refined vegetable oils are deodorized under high temperature conditions, which also produce some TFA. The adipose tissue of ruminants as well as milk contains trans fatty acids ranging from 1% to 8%. Trans fats are harmful to health. Excessive intake of TFA increases the viscosity and cohesion of blood, leading to a higher prevalence of blood clots. At the same time, TFA will affect the absorption of essential fatty acids by the fetus, affecting its mental and physical development. TFA also affects the secretion of male hormones and the quality of sperm. Some studies have proved that trans fatty acids will lead to an increase in the prevalence of Alzheimer’s disease. Apart from this, trans fat is also associated with obesity, coronary heart disease and many other diseases. Generally speaking, the intake of trans fats in a day should not exceed 1% of the total calories, about 2 grams. So you should reduce your reliance on processed foods and choose natural low trans fat foods to protect your health.