Some information from these website.

http://www.nhs.uk/Livewell/Goodfood/Pages/Healthyeating.aspx http://www.ext.colostate.edu/pubs/foodnut/09362.html http://www.healthknowledge.org.uk/public-health-textbook/disease-causation-diagnostic/2c-diagnosis-screening/principles-methods-applications http://www.helpguide.org/articles/anxiety/anxiety-attacks-and-anxiety-disorders.htm http://www.bupa.co.uk/health-information/directory/s/stress http://www.nimh.nih.gov/health/topics/depression/index.shtml