Other commenters have already hinted at this, but I suspect that terms like “saturated fat”, “seed oils”, and “omega-6 PUFA” are not specific enough, and I further suspect that this makes basically all studies mostly useless (because they work with these flawed coarse terms). “Saturated fat” can be tallow from factory-farmed cows or cultured butter from grass-fed grass-finished cows (and even that isn’t specific enough; was the grass sprayed with XYZ pesticide? etc.). “Omega-6 PUFA” can be highly heated seed oils chemically treated to deodorize them (masking their rancidity), or some of the oils in e.g. whole nuts. Even something specific-sounding like “extra virgin olive oil” can unfortunately mean pretty much anything because there’s a bunch of fraud going on, so the actual bottle in front of you probably isn’t the real thing.
My bottom line is pretty similar to yours though. Clearly something went wrong in the last few hundred years, and probably diet is a good chunk of it. So treat any kind of modern processing or ingredient with suspicion and as much as possible try to eat as humans ate before the last few hundred years.
Other commenters have already hinted at this, but I suspect that terms like “saturated fat”, “seed oils”, and “omega-6 PUFA” are not specific enough, and I further suspect that this makes basically all studies mostly useless (because they work with these flawed coarse terms). “Saturated fat” can be tallow from factory-farmed cows or cultured butter from grass-fed grass-finished cows (and even that isn’t specific enough; was the grass sprayed with XYZ pesticide? etc.). “Omega-6 PUFA” can be highly heated seed oils chemically treated to deodorize them (masking their rancidity), or some of the oils in e.g. whole nuts. Even something specific-sounding like “extra virgin olive oil” can unfortunately mean pretty much anything because there’s a bunch of fraud going on, so the actual bottle in front of you probably isn’t the real thing.
My bottom line is pretty similar to yours though. Clearly something went wrong in the last few hundred years, and probably diet is a good chunk of it. So treat any kind of modern processing or ingredient with suspicion and as much as possible try to eat as humans ate before the last few hundred years.