"Bad food and other stressors can degrade the whole system, producing functional rigidities similar to those resulting from a bad up-bringing, but if a person has a hint of the way things could be, the system can recover, sometimes with a change of diet, or climate, or of mental context-possibilities, or a missing hormone. If a person has a very rigid idea of how existence is supposed to be, the changed metabolism from taking thyroid, for example, making energy flow strongly, can seem as unpleasant as being in a foreign culture." -Raymond Peat