Please discuss dietary change with your medical advisor.
Maria for background you might like to read Brain Building Nutrition by Michael Schmidt.
http://books.google.co.uk/books?id=z...bnail#PPA22,M1
The Omega-3 Connection: The Groundbreaking Omega-3 Antidepression Diet and Brain Program By Andrew L. Stoll
There is a lot of material that suggests that increasing long chain Omega Three intake may reduce the risk of depression. A high proportion of the brain is made of fats. DHA a long chain Omega Three is critical to brain function. Western diets are often low in DHA.