'Take it with a grain of salt. But, if you'd looked at studies regarding trans fats, a lot of the conclusions may have looked shady 10-20 yrs ago.'
There's trans fats and then there's trans fats...
As a student back in the early 80's (83-84) I shared a house with a couple of medical students, I used to get it in the neck all the time from them about the 'unhealthy' amount of butter I used, that was until the night they came back in from Uni and binned everything they could find with any mention of hydrogenated vegetable oils in the ingredients, seemingly these fine substances and their negative impact on people's health were the topic of discussion of one of that day's lectures.
So, the medical profession in the UK was aware of the suspect nature of these beasties at least 34 years ago, which leads nicely into
'Ditto nitrites/nitrates in food. 30 yrs ago, a coworker told me that his advisor, he trained as a food manufacturing engineer, told him anyone in the industry already knew they were carcinogens.'
I heard similar back then, and on a related issue, one food engineer I knew back in the 80's refused to eat or drink anything out of a can/tin, this was long before anyone muttered anything publicly about BPA (the 90's, ISTR), and you do have to wonder how long they'd sat on this information, and what else they're sitting on.
Still, all this is the least of my current worries, I've just found out that soil samples taken less than 400ft uphill from my gardens contain levels of Lead, Benzo(a)pyrene, Dibenz(a,h)anthracene and, that old perennial favourite, asbestos which exceed 'Residential End Use Guidelines', oh, what fscking fun...(especially the asbestos..going by their figures, the worst case scenario is that there's potentially 400 metric tonnes of the stuff distributed all over the 6000 m² site..and that's only the bit they've sampled).