Psychiatric diagnostic labels are often used when we don't know the biological cause of brain symptoms, such as unrelenting depression, ADHD, OCD, or psychosis. If someone with "schizophrenia" is found to have vitamin B12 deficiency and correcting this makes the symptoms go away, researchers will say the person didn't really have schizophrenia. If someone with "major depression" is found to have hypothyroidism and correcting this makes the depression go away, researchers will say this person didn't really have major depressive disorder. Someday, we will be able to find the root cause(s) of everyone's brain symptoms and psychiatric labels will be a thing of the past. After all, they only represent a list of symptoms. That day should begin soon in my mind. The first step is to begin looking for the root causes of brain symptoms. We are actually capable of much more than we currently offer people. We could start with many of the basic mental health assessments that we already do, but add in assessments for insulin resistance, some hormones, some vitamins, inflammatory biomarkers, etc.