ibleedblue: I'm not trying to sound like a health nut, but just wanted to let anyone who cares know that there have been some studies that suggest olive oil can actually turn carcinogenic when exposed to high temperatures. It's complicated but basically every oil has a "smoke point" which is the temperature at which it turns from oil to smoke. Once it's smoking it becomes unhealthy to consume.
Mnemon: That's - by the science that's out there - actually an urban myth; contrary olive oil seems to do better in
reducing risk of cancer than many other common alternatives. Good high quality olive oil, that is, but that's the truth with all food stuff: High quality and as 'natural' as possible is always better for you.
See these studies, for example:
http://www.ingentaconnect.com/content/ben/cpd/2011/00000017/00000008/art00006 http://www.sciencedirect.com/science/article/pii/S0278691510004941 http://pubs.acs.org/doi/abs/10.1021/jf0730082 http://www.sciencedirect.com/science/article/pii/S0308814612002713 It seems you misunderstood me or misread my post. I never said in any way,shape, or form that olive oil is unhealthy to consume. I'm well aware of it's numerous health benefits. What I said was when oil starts to
smoke from excessive heat temperature, it becomes unhealthy to consume. That goes for all oils and is absolutely
not an urban myth. When oils are exposed to heat that is beyond their smoke point, they release something called polycyclic aromatic hydrocarbons (PAH), and this is a well known carcinogen that is also found in cigarette smoke. The links you cited are good studies, but they are faulty examples in reply to what I was saying and I'll tell you why:
The first link you cited (top one) is irrelevant as it has nothing to do with what I said. It simply debunks the myth that olive oil is unhealthy to consume. It says nothing about cooking the oil at high temperatures, which was the whole point I was trying to make with my original post.
The second study clearly states how long they attempted to fry the oil for, but nowhere could I find how hot the temperature was that they used. There's a big difference between making the oil start bubbling and making it smoke. If I missed it then please point it out to me because I'm curious about the study as well. But I couldn't find it anywhere.
Study 3 says that they fried the oil at a temperature of 180C, which is 356F. Study 4 similarly tested the oil at 190C, or 374F. This is definitely not considered high heat for cooking standards. My stove on high heat can easily reach 700+ fahrenheit, and most stoves can get close to that as well. So 356 and 374 degrees would be considered around mid-heat for what stoves are capable of nowadays. Please keep in mind that my original post was talking about cooking at
high temperatures. Now if people use olive oil and just put the heat in the middle then more than likely it's fine. But I know a ton of people that just put their stove on high in order to get the cooking done faster which would not be advisable with olive oil.
It should also be noted that the quality of the olive oil will determine at what temperature it begins to smoke. The higher the quality, the higher it's smoke point. Unfortunately, many grocery store brands of olive oil are of an inferior quality and will smoke at even lower temperatures than they're supposed to. Hope this cleared up the point I was trying to make.