Brain fog is not a medical diagnosis but a set of subjective symptoms that people experience and describe as: Drinking adequate amounts of water will also help increase mental clarity and concentration, help prevent headaches, and help remove cellular waste that accumulate in the blood and travel to the brain. The connection between the brain and gut is bidirectional, which means if one consumes a highly processed meal that is loaded with simple sugars, the brain will suffer from a lack of neurotransmitters and vital nutrients. Research has shown that an imbalance in the gut microbiome can lead to changes in mood, negatively affect learning and memory function4, and may also cause inflammation in the brain. So basically, food choice and a clean diet are tremendous for brain health.