> Red meat and dairy have significant amounts of trans fats. Natural trans fats [1] are made by bacteria in the rumen, and are rather different than manufactur

> Red meat and dairy have significant amounts of trans fats. Natural trans fats [1] are made by bacteria in the rumen, and are rather different than manufactured trans fats created from seed oils with hydrogen gas and catalysts. [1] https://en.wikipedia.org/wiki/Conjugated_linoleic_acid https://en.wikipedia.org/wiki/Conjugated_linoleic_acid - "The biological activity of CLA was noted by researchers in 1979 who found it to inhibit chemically induced cancer in mice [...] In 2008, the United States Food and Drug Administration categorized CLA as generally recognized as safe (GRAS)." > You're still probably better off with vegetable fats if you can help it, at least where partially hydrogenated oils are banned. Most polyunsaturated oils are deodorized ("refined"), so customers don't realize they're eating rancid oil. I bought unrefined grape seed oil years ago. Didn't know what to do with the obviously-rancid oil. Now I would give it to my father, so he could use it to help start his barbecue's charcoal.