But as the saying goes, the darkest hour is just before dawn. At some point during this “dark night of the soul,” I realized that the depression and despair I was feeling was the direct result of comparing my actual experience with an idea of what I thought my experience should be. I saw that I was striving for an ideal of health that was—at least at that point—unattainable, and that this was the cause of most of my suffering.
~ Chris Kresser
This idea is right at the heart of my experience of the last few years.