Fatty acid biosynthesis GO:0006633 IEV:0001439 KEGG:map00061 The chemical reactions and pathways resulting in the formation of a fatty acid, any of the aliphatic monocarboxylic acids that can be liberated by hydrolysis from naturally occurring fats and oils. Fatty acids are predominantly straight-chain acids of 4 to 24 carbon atoms, which may be saturated or unsaturated; branched fatty acids and hydroxy fatty acids also occur, and very long chain acids of over 30 carbons are found in waxes. event fatty acid anabolism fatty acid biosynthetic process fatty acid formation fatty acid synthesis Fatty acid metabolism