From: "Alex Shvartsman"
 > So all vegetable oils other than olive and Canola are
 > polyosaturated?:Sunflower, walnut, corn etc...?

Yes.  Simply check the label. They are more polyunsaturated than saturated
or monounsaturated.  The only fat that is stable against rancidity is
saturated.
There is a great book about fats written by someone by the name Enig(sp).
Someone else in the group will know the book.

Another thing that I do that others may do is when I open a bottle of  olive
oil I squirt a capsule of vitamin E into the bottle to prevent excessive
oxidation.

For what it's worth!

Jeff