Undoubtedly multi-factorial, but excessive omega-6 fats as a major driver is the most convincing theory I've heard. Interesting reading: https://www.breaknutrition.com/omega-6-fatty-acids-alternati...
My understanding is the omega-3 oils are problematic for humans too, they’re just not as acutely toxic as the omega-6 oils. I started avoiding seed oils in college. It was not the specific intervention I needed, but I believe avoiding this anti-food has helped keep me from deteriorating like people commonly do...