12/29/2025
Dec 21st marked the shortest day of the year, bringing colder temperatures and significantly less sunlight—conditions that can contribute to vitamin D deficiency and Seasonal Affective Disorder. With reduced sun exposure, many people experience lower vitamin D levels, which play an important role in mood regulation, immune function, and energy. This drop in natural light can also disrupt circadian rhythms and serotonin balance, leading to symptoms of SAD such as low mood, fatigue, and increased cravings. Winter is an ideal time to check vitamin D levels and discuss SAD.
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