Fatty acids are actively involved into large range of biological signaling pathways. When a diet is taken, the polyunsaturated lipids with in it peroxidate to produce powerful signals mediators. For example it produce eicosanoid which is peroxidation of LDL . Eicosanoid plays a very important role in modulating metabolic and neurological pathways.
They act as fuel source as they release fatty acids which are similar to fatty acids formed during the breakdown of glucose. Therefore these fatty acids generate energy while going thorugh the same path as that of fatty acid released during breakdown of glucose
