(Uma Naidoo) In my work as a nutritional psychiatrist, I support people with a variety of neurological and psychiatric concerns, ranging from pervasive conditions like depression and anxiety to day-to-day issues such as poor sleep, difficulty focusing, and, you guessed it — brain fog. While brain fog can be a symptom of many different diseases and syndromes, it can also be a result of foods in our diet that affect our blood sugar levels, oxygen supply to the brain, or inflammation anywhere along the process of thought and mood formation.