Saturated fatty acids (SFA) are fatty acids with saturated bonds. Saturated fatty acids in diet mostly exist in animal fat and milk fat, and these foods are also rich in cholesterol. Therefore, eating more saturated fatty acids is bound to eat more cholesterol. It was found that the activity of 3- hydroxy -3- methylglutaryl coenzyme A( HMG-CoA) reductase in the liver increased after eating a lot of saturated fatty acids, which increased cholesterol synthesis. Coconut oil, cottonseed oil and cocoa oil are rich in saturated fatty acids in plants.

Fatty acids other than saturated fatty acids (fatty acids without double bonds become saturated fatty acids and all animal oils are saturated fatty acids) are unsaturated fatty acids. Unsaturated fatty acid is a kind of fatty acid that constitutes body fat and is essential for human body. Unsaturated fatty acids are divided into monounsaturated fatty acids and polyunsaturated fatty acids according to the number of double bonds. Among food fats, monounsaturated fatty acids are oleic acid, and polyunsaturated fatty acids are linoleic acid, linolenic acid and arachidonic acid. The human body cannot synthesize linoleic acid and linolenic acid, so it must be supplemented from the diet. According to the position and function of double bonds, polyunsaturated fatty acids are divided into ω-6 series and ω-3 series. Linoleic acid and arachidonic acid belong to ω-6 series, while linolenic acid, DHA and EPA belong to ω-3 series.

Polyunsaturated fatty acids refer to linear fatty acids with two or more double bonds and a carbon chain length of18 ~ 22 carbon atoms. It is usually divided into omega-3 and omega-6. In polyunsaturated fatty acid molecules, the double bond farthest from carboxyl group is called omega-3 on the penultimate carbon atom. On the sixth carbon atom, it is called omega-6. It is synthesized by aquatic phytoplankton in cold areas, which is helpful to reduce cardiovascular and cerebrovascular diseases.

Every nutrition in food is equally important and indispensable. Lack of fat, like lack of any other nutrition, will cause physical discomfort. After digestion, fat is decomposed into glycerol and various fatty acids. According to different structures, fatty acids are divided into saturated fatty acids and unsaturated fatty acids, among which unsaturated fatty acids are divided into monounsaturated fatty acids and polyunsaturated fatty acids. Polyunsaturated fatty acids (PUSA) can be divided into ω-3 and ω-6 polyunsaturated fatty acids according to the position of the 1 th double bond from the methyl end. Among them, ω-3, like vitamins and minerals, is a necessity for human body, and its deficiency can easily lead to the dysfunction of important organs such as heart and brain.

Trans fatty acid editing entry

Fatty acids are a kind of carboxylic acid compounds, which are composed of hydrocarbon groups composed of hydrocarbons and carboxyl groups. Fat is a triacylglycerol ester composed of glycerol and fatty acids. These fatty acid molecules can be saturated, that is, all carbon atoms are interconnected, and saturated molecules are solid at room temperature. When carbon atoms in the chain are connected by double bonds, fatty acid molecules can be unsaturated. When a double bond is formed, there are two forms of this chain: cis and trans. Cis (cis) bond looks like a u-shape, and trans bond looks like a line. Unsaturated fatty acids formed by cis bonds are liquid such as vegetable oil at room temperature, while unsaturated fatty acids formed by trans bonds are solid at room temperature.

I hope I can help you, please give me a "good comment"