References:
www.health.gov/dietaryguidelines/dga2005/document/default.htm
www.hsph.harvard.edu/nutritionsource/index.html
www.nlm.nih.gov/medlineplus/encyclopedia.html
www.umm.edu/altmed/articles/omega-6-000317.htm#How%20to%20Take%20It
www.health.gov/dietaryguidelines/dga2005/healthieryou/html/chapter8.html#2