Hi All, I'd like to pass on some information that has helped me tremendously, as I understand it "the" cause of depression is not known, so I'm not saying this is the answer for everyone but it worked for me. I've suffered from mood swings, fatigue, irritability and brain fog most of my life, I been in some very deeply depressed states, all of which lifted by about 95% when I went on an all protein diet. I lost a lot of weight, fast, and felt better than I had ever felt, but I'm 5'10'" and I was down to 155#s so I started adding what I thought was safe carbs and the symptoms returned. At the time I didn't know anything about gluten or lactose sensitivities and I definitely wouldn't have suspected a fructose sensitivity. Long story short. Some of the symptoms of fructose malabsorption are brain fog, fatigue and depression, my symptoms lifted dramatically in 48hrs after eliminating fructose, sorbitol is another problem sugar especially combined with fructose. Again I'm not saying this will apply to everyone but I invite you to read through these links. I have asked around and most people I've talked to are unaware of this, yet it affects 1in3 people. Note: there is a difference between Hereditary Fructose Intolerance and fructose malabsorption or sensitivity.

http://en.wikipedia.org/wiki/Fructose_malabsorption

http://www.clinchem.org/cgi/content/full/45/11/2013

http://www.ncbi.nlm.nih.gov/entrez/q...&dopt=Abstract

http://www.ncbi.nlm.nih.gov/entrez/q...&dopt=Abstract