Any lack of nutrients can lead to mental health problems. Although small, it can lead to brain dysfunction. Many studies have shown that a balanced diet with healthy fats and fatty acids omega-3 is an essential factor for the all functions of the brain. B vitamins are the vitamins of the nervous system, and we need it for many important functions in every cell in the body. B vitamins are essential for the production of controlled metabolic stress and a variety of carbohydrates, protein and fat. Vitamin B deficiency, not a lot of things that happen, but it can cause both mental and physical illness. You can not concentrate or other hormonal problems insomnia, depression or other mental health problems almost what you should think the first problem is a lack of vitamin B.