The highly processed ones that are hydrogenated, such as cottonseed. Trans fat forms from that process. I think the more worrying thing about vegetable/seed oi

The highly processed ones that are hydrogenated, such as cottonseed. Trans fat forms from that process. I think the more worrying thing about vegetable/seed oils is the omega 6. A small amount is not an issue from my understanding. And in fact omega 6 can be healthy for some specific situations. But it’s the fact that these oils are used in just about all processed foods and restaurant cooking to the point where people are consuming more omega 6 than they should be and we’re seeing negative health effects as a result.