Omega−3 fatty acid
noun, plural: omega-3 fatty acids
A fatty acid is a long chain of hydrocarbon with a carboxylic acid at the beginning (called alpha) and a methyl tail (called omega). One of the ways by which a fatty acid is named is by counting, starting from the tail (omega, ω-) or the n-end. Thus, the name, omega-3 fatty acid, is one in which the first double bond is located between the third carbon and the fourth carbon of the hydrocarbon chain.
The omega-3 fatty acid is a polyunsaturated type. A polyunsaturated fatty acid is a type of unsaturated fatty acid with multiple double bonds. In humans, α-linolenic acid (ALA), eicosapentaenoic acid (EPA), and docosahexaenoic acid (DHA) are the three most notable omega-3 fatty acids. The omega-3 fatty acid is an essential fatty acid. This means, humans are not capable of producing this fatty acid due to a lack of desaturase enzyme that inserts double bonds between carbon atoms 3 and 4, and therefore must include it in the diet.
- n−3 fatty acid
- ω−3 fatty acid