People who have chronic fatigue syndrome (CFS) and Fibromyalgia (FM) often struggle with a kind of mental “fog”. We don’t understand why and there’s been little research on how to think more clearly. Mild Cognitive Impairment or MCI presents with a different kind of cognitive “fog” but it’s form might feel familiar. MCI affects some 15-20% of Americans, aged 65 and older. While anyone can develop MCI, the risk is higher among people who have a high blood level of the amino acid homocysteine. High homocysteine also predicts a higher risk for developing full-fledged Alzheimer’s Disease.