Maybe too many omega-6 compared to omega-3 fats?
Even this mainstream article only points to special situations like that or fire-charred fats, etc.:
https://www.healthline.com/nutrition/foods-that-weaken-immune-system#6.-Fast-food
That seems like kind of a big difference. Some people may have high Omega-6, while others are having high omega-3. I just had wild salmon six days in a row.