Oh yes, very possible! Sounds like the bacteria only make vaccenic acid and CLA, and there's probably going to be a whole host of other random crap in partially hydrogenated seed oil.
Oh God now I have to find out about hydrogenation. Why is it turning cis-fats into trans-fats anyway? Is that because you're heating things up and so they get randomized?
I'm just going to be maximally sceptical of vaccenic acid having health benefits until I see overwhelming proof, and I bet what we've got is a few crappy epidemiological studies where some signal has had to be tortured out of the noise.
It's a trans-fat, and unless it's got a specific use somewhere (which seems unlikely, because humans aren't obligate cow consumers, have you ever seen an Aurochs?) we're going to try to stick it into the Citric Acid Cycle somehow to burn it as fuel, and that's not going to work, because we won't deal well with the trans bond.
> Everyone without exception agrees that trans-fats are bad news, and there even seems to be good reason to believe it as well, which is nice.
Well, that's not true for one. Partially hydrogenated vegetable oil trans-fats are bad. But not everyone agrees they're even as bad as regular PUFAs (e.g. Tucker Goodrich thinks they're much safer than non-hydrogenated PUFAs, and there are studies in mice showing this).
Also it's not "magic" it's that the natural "trans-fats" in dairy are completely different chemicals than partially hydrogenated vegetable oils. They seem to actually be beneficial, and exist even in grass-fed dairy.
tl;dr, I don't worry about the "trans fats!!!!" in milk. They're a completely different thing than the "trans-fats" made from hydrogenated vegetable oils.
Moreover, in the same study, concentration of C15:0, C17:0 and the estimated mean concentration of total trans C18:1 FAs were significantly higher in milk derived from pasture fed cows compared with TMR fed cows.
Seems that there are actually positive, and grass-fed cows have more of them.
Sentence that caught my attention: "In contrast to industrially produced trans fats, the bacterial produced versions exist only as a few isomers."
Very well possible that different isomers have different effects on the human metabolism?
Oh yes, very possible! Sounds like the bacteria only make vaccenic acid and CLA, and there's probably going to be a whole host of other random crap in partially hydrogenated seed oil.
Oh God now I have to find out about hydrogenation. Why is it turning cis-fats into trans-fats anyway? Is that because you're heating things up and so they get randomized?
I'm just going to be maximally sceptical of vaccenic acid having health benefits until I see overwhelming proof, and I bet what we've got is a few crappy epidemiological studies where some signal has had to be tortured out of the noise.
It's a trans-fat, and unless it's got a specific use somewhere (which seems unlikely, because humans aren't obligate cow consumers, have you ever seen an Aurochs?) we're going to try to stick it into the Citric Acid Cycle somehow to burn it as fuel, and that's not going to work, because we won't deal well with the trans bond.
> Everyone without exception agrees that trans-fats are bad news, and there even seems to be good reason to believe it as well, which is nice.
Well, that's not true for one. Partially hydrogenated vegetable oil trans-fats are bad. But not everyone agrees they're even as bad as regular PUFAs (e.g. Tucker Goodrich thinks they're much safer than non-hydrogenated PUFAs, and there are studies in mice showing this).
Also it's not "magic" it's that the natural "trans-fats" in dairy are completely different chemicals than partially hydrogenated vegetable oils. They seem to actually be beneficial, and exist even in grass-fed dairy.
> They seem to actually be beneficial, and exist even in grass-fed dairy.
Oh, OK, probably I'm wrong then. How much trans-PUFA is there in grass-fed milk?
Not entirely sure, but this study seems to have some numbers related to this:
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7555635/
tl;dr, I don't worry about the "trans fats!!!!" in milk. They're a completely different thing than the "trans-fats" made from hydrogenated vegetable oils.
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6723057/
Moreover, in the same study, concentration of C15:0, C17:0 and the estimated mean concentration of total trans C18:1 FAs were significantly higher in milk derived from pasture fed cows compared with TMR fed cows.
Seems that there are actually positive, and grass-fed cows have more of them.