I had psoriasis on one elbow and on the heels of my feet for more than 6 years. The psoriasis went away after going completely Gluten free for about 3 months. From time to time (about once a month) I would eat something containing wheat and the psoriasis and a rash on my forehead would begin to come back. In my case and that of many other people, going gluten-free helps to clear up brain fog and helps to give you more energy.
Several recent articles that I have read about people being sensitive to gluten, state that there may also be a relationship to Roundup for people who are "gluten sensitive". Although wheat is not a gmo crop, Roundup containing glyphosate is frequently used on wheat crops (and many other crops). Do your own research on this by using the search - "is roundup the cause of gluten intolerance" - to find more details about this. Though I have gone gluten free, this has not fully worked to resolve several other health issues.
Something that really did help to resolve fatigue and brain fog is D-Ribose Powder (1 1/2 teaspoons taken in water in the morning). A friend gave me the book "From Fatigued to Fantastic" by Jacob Teitlelbaum, M.D. The book addresses chronic exhaustion, achiness, brain fog, poor sleep, recurrent infections and more. The author is the Medical Director of the Fibromyalgia and Fatigue Centers. On page 34 of the third edition, it is suggested that one use D-Ribose as studies showed an average increase in energy of 45% and overall well-being of 30% from this single nutrient. In my case, I found the energy increase to be closer to 75-80%.
The rest of the book discusses other supplements that can improve one's condition - some of which I was already taking. (See reader comments on Amazon.com for more input - 163 reviews as of 10/17/14). If you do research on D-Ribose, you will find that many dedicated athletes use this supplement. At first I thought I qualify more as a couch potato than an athlete and maybe this is not for me. But, I gave D-Ribose a try and found it really cleared my mind and gave me the energy that I needed to complete my daily To Do List. D-Ribose is not just for athletes and older people but for anyone experiencing fatigue and brain fog. It is suggested that one use this in the morning as it really does clear your mind and could keep you from getting to sleep at night. Sorry to have gone slightly off-topic, but D-Ribose is such a great find that I included it here.