I recently found out that I was extremely deficient in Vitamin D. Interestingly now that I am taking a large daily dose (10,000 units/day), I'm feeling a bit clearer.

I've also pretty much weaned myself from white sugar and most white flour and am trying to eat more fiber and less red meat. I use a cool website called The Daily Plate to educate myself about what I eat. It breaks down foods into calories, carbs, fats, fiber, etc.