@Sugarplum, I recently finished those two books and I’m new to the forum as well :) I don’t think you should avoid your favorite nut butters, however it wouldn’t be smart to make them your primary food source day in and day out either. Right now, what’s more important than avoiding PUFAs is fixing the systemic problem. Fueling your body with enough energy and overcoming the controlling avoidance mentality is a bigger priority. If avoiding nut butters is going to perpetuate a fear of foods, I don’t think its worth it, because that fear puts the body under stress which Matt explains is what lowers the metabolism.
I wish you the best on your road to recovery!