I'd had blood work done about a month ago. I was a bit concerned, as always, of my blood sugar, because I'd had gestational diabetes. It was elevated a bit. My vitamin D was extremely low. My Dr has ordered an 8 week course of 52,000 mg once/week, then a follow up. I've only done a quick search. It's prevalent in children with psychosis. Well. It causes fatigue, confusion, and depression. I told my psychiatrist at my last visit that my memory has gotten really worse. He ordered an MRI, from my regular Dr, which I'm still waiting for. It appears people with depression and anxiety have a lower level of vitamin D. It will also make you insulin resistant. It's sounding like a Catch 22. But, naturally, there are other serious repercussions of not having enough vitamin D. Our bodies don't produce it. We either have to get it from the sun or food. I don't recall off the top of my head how many Americans are deficient, but it was astounding. There are home tests available. It can cause cancer, dementia,thyroid problems, immune issues, osteoporosis, heart disease, stroke, and diabetes. I've includes two links; the first is info about vitamin D, the second contains foods rich in vitamin D.