HI qika,
Here's what I posted about canola a while back when someone else was asking about it:
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The healthy oil debate can be really confusing - even for me, and I've been thinking a lot about it. I took me a long time to really sort through things. I've actually made quite a lot of changes to my pantry over the past two years on this front.
Let me start by saying, I think it is up to each individual to really research the pros + cons of the different oils/fats that are available - I'm working on a much longer explanation of where I ended up on this topic and why, but it won't be ready for a while.
As I said on the discussion boards, I've come to the conclusion that I want all the fats/oils I use to be both organic AND unrefined. When choosing an oil/fat I also think about intended cooking temperature, and how that will impact the oil - but maybe we can get into that later.
In this case we are talking about canola oil - which shows up in stores refined the vast majority of the time. If you are interested in healthy oils - you have to limit yourself to unrefined products. Many of the beneficial qualities inherent to an oil are damaged (or stripped from the oil) in the refining process. Check out this flow chart if you are interested in seeing how some edible oils are processed:
http://www.westonaprice.org/images/edib ... wchart.gif Chemicals, solvents, bleaching - no thanks.
Saturated fats: I would much rather use a natural, organic, fresh, unrefined oil rich in saturated fat than one that might be lower in saturated but has been processed via the method we saw above. While I avoid refined saturated fats, if you go back and look at traditional diets that are rich in natural sat. fats - for example, Pacific Islander's pre-1970 or so, you will notice that diabetes, heart disease, cancer, and thyroid problems were nearly non-existent. This is all prior to the invasion of processed Western foods.
Bottom line...If I can't explain to you in simple terms how an oil is produced, then I probably don't want to make it a cornerstone of my cooking.
It is a big topic. If you are interested in delving deeper, here are a few places to start:
Mary G. Enig, PhD: start here. Dr. Enig cuts through the crap and tells it like only a lipid biochemist can.
http://www.westonaprice.org/knowyourfats/index.html
The Great Con-ola:
http://www.westonaprice.org/knowyourfats/conola.html
Rebecca Wood is a knowledgeable resource, author of The Splendid Grain and the New Whole Foods Encyclopedia.
http://www.rwoods.com
There are also quite a lot of books out recently talking about beneficial fats like coconut oil - so look for those as well.