Here's an interesting and complicated new post from Dr. Michael Eades. He argues that - apart from bad carbs - one of the main drivers of the obesity epidemic may be vegetable oils:
Dr. Eades: Will the new Dietary Guidelines make us even fatter?I'm not sure what to make of this complex idea. If vegetable oils reduce insulin resistance, via the "FADH2 to NADH ratio", why would that necessarily increase obesity? Couldn't it just as well have the opposite effect?
However, vegetable oil consumption has risen to unprecedented - an evolutionarily abnormal - levels, coinciding with the obesity epidemic. There are certainly reasons to treat them with caution. And don't heat them.