Provided herein is technology relating to lipid compositions containingbioactive fatty acids andparticularly, but not exclusively, to compositions and methods related to theproduction and use ofstructured lipid compositions containing sciadonic and/or pinoleic acid aloneor in combination with otherbioactive fatty acids including, but not limited to, eicosapentaenoic acid,docosahexaenoic acid,conjugated linoleic acid, and non-.beta.-oxidizable fatty acid analogues suchas tetradecylthioacetic acid.