Vegetable oils aka seed oils are worse than sugar and processed grains and carbs. Dr. Catherine Shanahan calls them Brain Killers. Below are from her 2008 book Deep Nutrition: Why Your Genes Need Traditional Food.

Listen to Dr. Benjamin Bikman's video Dr Ben Bikman - Why We Get Sick from Insulin Resistance

^ go to 29:26 for the vegetable oil / seed oil segment

4-Hydroxynonenal or 4-hydroxy-2-nonenal or 4-HNE or HNE [ wikipedia ]

Special attention must also be paid to cooking oils used repeatedly in caterings and households, because in those processes very high amounts of OαβUAs are generated and they can be easily absorbed through the diet.

[ add ghee to good fats ]