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When PUFA is present and oxidation is going on, you're tending to be torn up with free radical lipid peroxidation and such.

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So the PUFA does feed oxidation and can help with weight loss, but that turns out to be almost purely destructive.

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You don't want to lose weight that way.

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The excess of thyroid, when you have a moderate excess of thyroid and DHEA, which increase the wasteful use of oxygen, that waste is protective.

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Animals which are uncoupled, and especially those which have a low PUFA in their tissues, are longer lived.

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The saturation index, if an animal's fats are highly saturated, it has a longer life.

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And that means that it can run its oxidative metabolism at a much higher rate being uncoupled and living longer because its fats aren't set to explode or catch fire with the free radical activity going on.