Unsaturated fatty acids found in plant oils and seeds are typically omega - 6 fatty acids, in which the first double bond is located on the sixth carbon atom, counting backwards from right to left. (oilgae.com)
Omega - 3 fatty acids — in which the first double bond in on carbon # 3 - are prevalent in fish oils and flax seeds. (oilgae.com)
A final dimension of fats that plays a role is where the first double bond is located in a polyunsaturated fat, which distinguishes omega - 3 from omega - 6 fats (position 3; position 6). (healthimpactnews.com)