There’s some evidence to suggest that diets rich in polyunsaturated fats, especially from refined vegetable oils, are associated with increased levels of oxidized blood lipids, lipid peroxidation, and other markers of inflammation.27 28
If you only use refined corn or safflower oils to lightly coat veggies before roasting them, you likely don’t have much to worry about.
However, for the vast majority of people, the biggest source of refined vegetable oils isn’t home-cooked meals—it’s ultra-processed foods.
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