Brain fog sure points to inability of the liver to detoxify natural food toxins and pollutants. According to Hulda Clark , flukes and other parasites in the liver can severly limit the liver's ability to detoxify. A good detox program, liver flushs and parasite killing programs are necessary to clear this up. See the links to Clark's and Moritz's programs. It is a wonderful feeling to be alert and clear minded after doing the programs. Also brain fog is one of the most common problems in people who are sensitive or intolerant to gluten in wheat, barley and rye. See Celiac.com for more information.