at0mic
You are wrong

unsaturated fat is mostly represented in vegetarian oils. Also fat fish has a good deal of unsaturated fat.
Thistle oil contains 74% 18:2,n-6 fatty acids.
18 = number of carbon atoms
2 = nuber of double bindings
6 = the first double binding is at the 6th carbon atom.
Wineseed oil has 67,3% of the same fatty acid
sunflower oil has 63%
corn oil has 55,2%
Flax seed contains 63,3% 18:3,n-3 fatty acids, wich is an extreme amount, and with three double bindings, this oil is very sensitive.
Fish is the best source of omega3 fatty acids, wich is a group of longer unsaturated fatty acids (20:5,n-3, 22:5,n-3 22:6,n-3).
Butter contains a large portion of the very short fully saturated fatty acids (like 4 atoms being the smalest one). Thus butter, while a (in clinical terms of health) is a bad choise for stuff, that needs no heating, but an exelent choise, if you need to heat something up - it is (for fat) very stable.
Most health specialists I know of recomend olive oil for frying, as it contains 67,7% monounsaturated fatty acids, wich is more stable than the polyunsaturated fatty acids, but still much better i.e. for you cholesterol level than saturated fat. also it only has 7,6% of polyunsaturated fat, wich is rather low for vegetarian oil.
20:4,n-6 is (mostly?) from meat and fish.
Much reseach still needs to be done in this area, but it is recomended to get a varied mixture of fatty acids. Some people find it hard to sleep, if they eat to much polyunsaturated fat before going to bed. Polyunsaturated fat can also make you "burn" more, thus helping you to loose weight - do not overdo it though.
Now look what you have done at0mic!!!
You made me look up the big book.
(maybe this thread needs renaming: "does anyone from CW eat fatty acids?").
Immanuel
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I was a food geek