Evidence of biochemical causes for mental disturbances continues to mount. Experiments have shown that symptoms of mental illness can be switched off and on by altering vitamin levels in the body. The British Journal of Psychiatry found that forty-eight out of fifty-nine psychiatric patients had folic-acid deficiencies. Other research has shown that the majority of the mentally and emotionally ill are deficient in one or more of the B-complex vitamins or Vitamin C. Niacin or folic acid deficiency can cause normal happy people to experience depression and other emotional disturbances. Above average amounts of Vitamin B1 can help alleviate depression and anxiety attacks.