Agree with person

Sugars are not the issue in my mind.

Polyunsaturated fats may be the problem as they are easy to oxidise.

The more Polyunsaturated the fats the easier it damages with heat and light.

Olive oil has to be put in a dark tinted bottle to not have the fat damaged and it is mostly monounsaturated. Imagine an omega 3 Polyunsaturated from fish with many weak double bonds between carbon atoms. 

The molecules in seed oils change with sunlight and heat.. that's how plants know when to germinate.

Don't be afraid to eat cards and saturated fat.

Maybe try reduce intake of Polyunsaturated oils