Vitamins have a prominent role in mental and emotional well being. When the blood sugar or glucose level in brain decreases, depression, irritability, anxiety are caused due to lack of Thiamine. In taking foods containing carbohydrates increases the sugar level thereby reducing the deficiency of vitamin B1. Include foods that are enriched with niacin to prevent dementia. The excess stress and depression can be avoided by having vitamin B5. Vitamin B6 enhances the production of amino acids, building blocks of protein in our body. Lack of vitamin B12 leads to improper supply of oxygen in our body and this causes dementia, hallucinations, mood alterations etc. Vitamin B12 deficiency is mostly found in old aged people because an enzyme that absorbs B12 from our intestinal tract diminishes as we grow old.