Brain fog isn’t a formal diagnosis, but it’s a real and frustrating experience—often described as mental cloudiness, memory lapses, difficulty concentrating, and slow thinking. In functional medicine, brain fog is a red flag for underlying imbalances: it may result from blood sugar swings, food sensitivities (like gluten), chronic inflammation, mold exposure, poor sleep, gut-brain axis disruption, or mitochondrial dysfunction. By investigating root causes and using targeted nutrients, detoxification support, and lifestyle strategies, brain fog can often be significantly reduced or eliminated.