The veggie oil industry spent billions of dollars in the 1970s & 80s indoctrinating people to favor "Polyunsaturated fat" as being good. Anybody remember William Shatner shilling for "Promise Margarine?"
Going on the nutristrategy.com web site (pro Shatner, it appears), all of the oils that paleos are taught to avoid (corn, soy, canola...) are poly (not just mono) unsaturated.
While some newbies on paleo might eat less fat than they should, I tend to forget to eat enough carbs. That's why I have yams at the ready. I feel the the combo of fat (mostly olive oil on salad for me, it seems) and a bit of starch buffers me pretty well from a blood sugar standpoint.
That's why the paleo endurance athlete writers are correct. Fat is wonderful fuel for a couple hours. After that, it's either Yam Power or some sort of in-CamelBak dilute sugar source. Maybe I'll make my own out of dextrose.
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