When we say fried food do we mean KFC fried, or like if I cook a steak or some chicken in a pan I'm fucked? I use olive oil in my stir fry, which I cook at "7" on my stove. My stove has that dial that goes from off to 10. Is 7/10 then some high heat that's fucking over my olive oil and causing some cancer compounds to be released?
edit: LOL that chart. Damn and linvisvii was almost scaring me with his fear mongering. But according to that chart I could safely stir fry my shit with sunflower/corn/canola oil. I never cook it longer than 8 minutes. In which case it has a not even significant difference from olive oil or butter.
Fried food would be of the deep fried variety. In a commercial kitchen the Fryolator (yes, the name is that awesome) is going to be set at 375 F. And that oil will be heated to that temp for the entire duration of service. The fried food you eat at a restaurant will have the toxins the study mentions. Are these toxins worse than eating the fried food itself?
Another thing to note is that just because you fry food in oil that oil is not fully consumed. When you pour 3 cups of oil into a pan and deep fry some chicken you will later end up pouring out 2.98 cups of oil into the trash. Oil is fat but the nature of frying does not mean you consume just oil and fat.
Another issue is where the toxins are coming from. In a restaurant Fryolator you will find broken off particles of the food you fry. When you bread chicken and dunk it in a deep fryer some of the breading will break off and remain in the fryer. It's the job of the fry cook to remove it. Perhaps those remains that turn into cinders are adding to the aldehyde count.
Your steak or chicken in a pan is called pan fried or maybe just pan cooked or maybe even sauteed. As you noted you will normally not cook chicken or steak in a pan for 30 minutes. And if you are you will be using low heat.
You asked what low heat vs high heat is. High heat was 350 degrees in the study. That is quite high and used for foods that you want to cook fast, under 10 minutes. Low heat is what is used for a long roast or BBQ, 250 F 280 F or under.
Conclusion: For the past 10 years I have been reading every report about
canola oil in order to find out if it's bad for you our not. Aside from Food Babe logic there is very little to say it is bad for you. The study addressed in this thread is the most evidence that canola oil is bad for you yet it's real world impact is questionable. It is indeed clear that eating deep fried foods ups your aldehyde intake. If you wish to avoid aldehydes then limit your consumption of deep fried foods.
Further Questions: What about baking? Oils have smoke points in which they begin to burn and release smoke. Baking almost always requires 350F. Butter, virgin olive oil, and coconut oil have smoke points at 350 or less.
Is it better to have your oils burn or release aldehydes when baking? I don't bake so I don't know the real world effects.
These threads reveal very little besides which members are notably proud for not using vegetable oils so they can tell us what they use instead. So brave.