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Perhaps an underlying dietary change may explain this reduced mortality.
It is at odds with the evidence of increasing obesity in the population.
I suspect that the phasing out of trans fatty acids from manufactured food may correlate with improved health generally.
In the case of stroke TFAs make cell walls stiffer and perhaps more prone to rupture.
There is a general reduction in heart attacks in US over an earlier period.
This was thought to be due to statins but may also have been a result reducing TFAs in the diet?
Is there any post mortem analysis of brain tissue for TFAs?