As the days grow shorter and sunlight becomes scarcer, many people find themselves experiencing symptoms of Seasonal Affective Disorder (SAD). This mood disorder is commonly linked to the lack of natural sunlight, which disrupts our circadian rhythm, hormone balance, and vitamin D synthesis. From a functional nutrition standpoint, a root cause approach to managing SAD goes beyond just addressing the symptoms; it looks at underlying nutritional imbalances and deficiencies that may exacerbate mood and energy disturbances during these darker months. Here, we’ll explore key nutrients that can support brain health, boost mood, and help combat SAD—and the foods that provide them. I’ll also add a list of functional labs to recommend to your healthcare provider if you feel you need a deeper dive in to nutrition and your mood!