Diabetes and serious mental illness run in the same families.
Insulin was discovered around the turn of the century and was used in mental patients because of the connection between insulin, diabetes, and mental illness.
Metabolic abnormalities in the bodies and brains of people with serious mental illness were discovered, including increased levels of lactate.
People with schizophrenia and bipolar disorder have abnormally high levels of lactate in their bodies and brains even at rest.