Which vitamin deficiency is commonly associated with a lack of sunlight exposure?

A deficiency in vitamin D is commonly associated with a lack of sunlight exposure because vitamin D is synthesized in the skin upon exposure to ultraviolet (UV) rays from sunlight. This vitamin plays a crucial role in various bodily functions, including calcium absorption, bone health, and immune function. When individuals do not receive sufficient sunlight, especially in regions with limited sun exposure or during winter months, their body may not produce enough vitamin D, leading to deficiency. This can result in conditions such as rickets in children and osteomalacia in adults, both of which are associated with weakened bones.

In contrast, other vitamins listed do not rely on sunlight for their synthesis or absorption. Vitamin A, Vitamin B12, and Vitamin C are primarily obtained through dietary sources rather than through sunlight exposure. Therefore, the link between sunlight exposure and vitamin D deficiency is particularly significant in understanding the health impacts associated with inadequate sun exposure.