Seed oils are problems because of trans fats, typical use, and hexane leftovers. All wind up as products harmful to human health. If someone buys a big bottle, stores it in a visible place in the kitchen, slowly uses it over a few months, and on the highest heat possible, that's not good due to the gradual deterioration of the product. Alkenes thirst for stability and O2 is willing to play and pierce. The frying pan(or deep fryer) is also a reaction playground.
Given that impeachment of the chemical would be utterly inevitable if a chemical analysis of fried veggie oil byproducts after high heat cooking is used, the scientists simply design studies that avoiding entering such high temps. The same applies to restaurant oil reused for a week or more.
0g of trans fats doesn't really mean zero in U.S legal speak. It's obvious why. Restaurants are in a precarious position and cheaper oils can mean the difference between a living business and death of the business, especially when they are in a pincer where big business wants to crush them and the laborers only care about more pay regardless of the business's health.
The experts consider the public clueless and impressionable, which is true. Most don't have experience in organic chemistry to understand the language. Scientific omission leads the reader to incorrect inferences. It would be very hard to find the exact trans fat that was implicated as harmful. Elaidic acid is that fat.
Rather call for puritanical avoidance, the folks at Havard employ false equivalence, using the grounds that certain natural foods also contain trans fats, without specifying the chemicals. Maybe that should be extended to other realms, like replacing propylene glycol with ethylene glycol (and wind up killing people).
I’m confused about whether canola oil is healthy. I know that it’s a polyunsaturated fat, which I’m told is good, but then I also hear that I should stay away
www.hsph.harvard.edu
Cold-pressed oils or sesame oil don't go through the extra refining of the common vegetable oils.