39. Oils and foods that contain linoleic acid include safflower oil (78%), poppy seed oil (70%), walnut oil, grass fed cow milk, olive oil, palm oil, sunflower oil, soybean, lard, coconut oil, egg yolks (16%), spirulina, peanut oil, okra, rice bran oil, wheat germ oil, grape seed oil, macadamia oil, pistachio oil, sesame oil. Studies have shown that foods that contain Linoleic acid reduce blood pressure.
http://www.springerlink.com/content/j71412r15122686h/
http://hyper.ahajournals.org/cgi/content/abstract/31/2/615
good sources are oils made from
* Safflower
* Sunflower
* Corn
* Soya
* Evening primrose
* Pumpkin
* Wheatgerm.
Conjugated Linoleic Acid
A double-blind, randomized, placebo-controlled study, published in the December 2000 issue of the Journal of Nutrition found that CLA reduces fat and preserves muscle tissue. According to the research project manager, an average reduction of six pounds of body fat was found in the group that took CLA, compared to a placebo group.
Apparently Pasture-grazed cows had 500% more CLA in their milk than those fed silage.

Oleic acid is related compond found in olive oil and many plants that have linoleic acid. Oleic acid also lowers BP but not as much as linoleic acid.
http://jn.nutrition.org/cgi/content/abstract/137/2/384 this study didn稚 find a reduction in BP but did find a reduction in parameters that measure heart disease.
Oleic acid makes up 55-80% of olive oil - one reasons olive oil is good for you.
Human body can produce all but two of the fatty acids it needs. These two, linoleic acid (LA) and alpha-linolenic acid (LNA), are widely distributed in plant oils. In addition, fish oils contain the longer-chain omega-3 fatty acids eicosapentaenoic acid (EPA) and docosahexaenoic acid (DHA). Since they cannot be made in the body from other substrates and must be supplied in food, they are called essential fatty acids. Mammals lack the ability to introduce double bonds in fatty acids beyond carbon 9 and 10.Hence linoleic acid and linoleinic acid are essential fatty acids for humans. In the body, essential fatty acids are primarily used to produce hormone-like substances that regulate a wide range of functions, including blood pressure, blood clotting, blood lipid levels, the immune response, and the inflammation response to injury infection.
http://www.3dchem.com/molecules.asp?ID=384

For a while I used sunflower oil and I found it seemed to reduce blood pressure. I didn't find as good effect from Canola oil but then it perhaps I wasn't using it as much. I tend to use canola oil because it is cheaper... but a variety of these good fats is probably a good idea in the diet.

At one point I was thinking that all oils and fats are bad for one ... but actually not true, these fatty acids are essential diet factors. So some olive oil on the salad, or canola oil in a crisp or a cake or bread is good for you.