Food & Diet : Cooking Fats — What to Use and When

Oct 26/26

Every fat's got a number attached to it now — the smoke point, printed on the bottle or taped up on a chart in some cooking blog, telling you how hot you can push it before it starts to burn. Canola usually ranks near the top of those charts, refined olive oil somewhere in the middle, extra virgin lower down. I always figured that number told you what you needed to know: rank higher, safer bet for a hot skillet. Turns out the number is true enough, and it still isn't telling you the thing you actually want to know.

Researchers writing in the Journal of Agricultural and Food Chemistry heated canola oil, extra virgin olive oil, and refined olive oil to a standard frying temperature — 180 degrees Celsius, better than 350 on a kitchen dial — for fifteen hours at a stretch, then past the smoke point, up at 240. They weren't watching for smoke. They caught the fumes and ran them through a gas chromatograph, counting sixteen aldehydes, acrolein chief among them — the same compound that makes your eyes water over a scorched pan, tied to lung irritation with enough exposure. At frying temperature, canola put out acrolein at close to six times the rate either olive oil did — better than fifty milligrams an hour per liter, against nine and change for the olive oils. Push past the smoke point and canola's output nearly quintupled again. The olive oils barely moved.

That's the same trap as buying a tractor off the horsepower number on the spec sheet. The number's true enough, measured a certain way — it just doesn't tell you what that engine does at three in the afternoon, pulling a disc through ground that didn't dry out the way the forecast promised. Smoke point measures one thing: when a fat starts visibly breaking down. It doesn't measure what's already coming off that fat, invisibly, well before it gets anywhere near there. Olive oil carries its own antioxidants along with it — the same polyphenols that give a good extra virgin its bite at the back of your throat — and those appear to be doing real work holding the fat together, chart ranking or not.

I'll say plainly what the study doesn't cover: three oils, one narrow slice of the pantry, cooked far longer and harder than most of us run a skillet on a Tuesday. Nothing here about butter, lard, avocado oil, or the tallow some people have gone back to lately. Fifteen hours in a lab reactor isn't fifteen minutes of eggs before work. A soil test tells you something true about the handful in the bag. It doesn't tell you what the whole field does once you're actually out there working it, season after season.

What I take from it isn't which oil wins. It's that the number on the label was never the whole story, in the kitchen any more than on the ranch — a starting point, same as any bulletin, worth checking against what's actually coming off the pan. This week's habit is simple enough: cook with three different fats this week, and note the flavor difference.

This is a record of what I've read and observed, not medical advice. I'm not a doctor, and nothing here should replace a conversation with one. Any drug, dose, or treatment decision -- Mounjaro included -- is between you and your own physician. What works in my reading or in the field doesn't automatically apply to your situation.

From the Field:

Food Safety Recalls & Outbreaks -- https://www.foodsafety.gov/recalls-and-outbreaks

Mayo Clinic -- mayoclinic.org

fitandwell.com

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