In reply to winhill:
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> The trans fat in marg comes from the hydrogenated fats, most UK marg now avoids these so in fact butter can have 30-40 times the amount of trans fat as margarine (butter is 3-4% trans fat).
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> So if you're trying to avoid trans fat you seem to have that the wrong way around.
We need to be careful demonizing a whole food group. The 'Cholesterol is bad' debate has been increasingly refined over time as we've learned more (we now see HDL, LDL and LDL sub-types A and B, amongst others).
The 'Fat is bad' notions of the 1970 has gone the same way - it is way more complex, and the same applies to carbohydrate.
In each of these cases there is further to go in terms of knowledge.
With regard to trans fat, there is a natural trans fat called vaccenic acid (found in beef and dairy products) which looks to be beneficial - so I'd be relaxed about such a fat compared to its industrial analogue.
One thing that has struck me nearly a decade go is, "In what form of humans store fat?" The fat profile is, as far as I can tell, largely saturated. So this then raises the question, why would we have evolved to store fat in a form supposedly toxic to us? That thought put be back on to animal and dairy fat.
Post edited at 12:27