Identify a key vitamin deficiency that can lead to depression.

Vitamin D deficiency plays a significant role in mental health, and research indicates a strong association between low levels of vitamin D and increased risk of depression. This vitamin is crucial for various brain functions, including mood regulation and overall cognitive health. It contributes to the synthesis of neurotransmitters, such as serotonin, which are essential in maintaining stable mood levels. Additionally, vitamin D receptors are present in many areas of the brain, highlighting its importance in brain health.

Low vitamin D levels can result from various factors, such as limited sun exposure, certain health conditions, or dietary insufficiencies. Addressing vitamin D deficiency through sunlight exposure or dietary changes has been shown to help alleviate symptoms of depression in some individuals. Thus, recognizing and correcting a deficiency in vitamin D can be a vital component of a comprehensive treatment strategy for depression.