Fatty acid

Fatty acids are carboxylic acids with long aliphatic chains, which can be either saturated or unsaturated. They are a key component of lipids, which are a group of naturally occurring molecules. Fatty acids are important for a number of bodily functions, including energy storage, cell membrane structure and function, and as precursors to signaling molecules.

Structure and Classification

Fatty acids consist of a straight chain of an even number of carbon atoms, with hydrogen atoms along the length of the chain and at one end of the chain and a carboxyl group (-COOH) at the other end. They are classified into two main types: saturated fatty acids and unsaturated fatty acids.

Saturated Fatty Acids

Saturated fatty acids have no double bonds between the individual carbon atoms of the fatty acid chain. That is, the chain of carbon atoms is fully "saturated" with hydrogen atoms. Examples of saturated fatty acids include palmitic acid and stearic acid.

Unsaturated Fatty Acids

Unsaturated fatty acids have one or more double bonds in the fatty acid chain. They can be further classified into monounsaturated fatty acids (one double bond) and polyunsaturated fatty acids (more than one double bond). Examples of unsaturated fatty acids include oleic acid and linoleic acid.

Functions

Fatty acids play several key roles in the body. They serve as a major source of energy, contribute to the structure and fluidity of cell membranes, and are precursors to eicosanoids, which are signaling molecules that regulate inflammation and immunity.

Dietary Sources and Health Effects

Fatty acids are found in a variety of foods, including meats, dairy products, and oils. The type and amount of fatty acids in the diet can have a significant impact on health. For example, diets high in saturated fatty acids are associated with an increased risk of heart disease and stroke, while diets high in unsaturated fatty acids are associated with a reduced risk of these conditions.

See Also

• Lipid metabolism
• Fatty acid synthesis
• Fatty acid degradation

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