Brain fog can stem from various causes, including stress, poor sleep, hormonal imbalances, and dietary deficiencies. Factors such as high sugar intake, refined carbohydrates, and vitamin B12 deficiency can contribute to cognitive sluggishness. Additionally, conditions such as thyroid dysfunction, gut imbalances, and chronic inflammation may play a role. Identifying and addressing the root causes of brain fog—whether through improved nutrition, stress management, or better sleep—can help restore mental clarity and focus.