you would know if you consumed seed oils in the amounts that americans are being fed with it  its mixed into almost every industrially processed food and its proven to cause inflammatory reactions in the digestive tract which translate into bad bowel syndrome, skin rash, reflux, impaired cognitive function, lowered fertility and many more  if you are affected and remove seed oils form your diet and you experience improvements on the conditions then you know it was due to seed oils, this is basically how it was figured out that the industry is poisoning people with those seed oils, every economic zone has different poisons btw
Germany