Which of the following is a consequence of a deficiency in Vitamin D?

A deficiency in Vitamin D has well-documented consequences, one of which is an increased risk of fractures. Vitamin D plays a crucial role in calcium absorption and bone metabolism. When the body does not have enough vitamin D, calcium absorption from the diet decreases, leading to weakened bones and a higher likelihood of fractures. This effect is particularly notable in older adults, who are already at a higher risk for osteoporosis and fractures.

The other options presented do not align with the known functions associated with Vitamin D deficiency. Improved vision, elevated energy levels, and enhanced immune function are not direct consequences of a vitamin D deficiency; in fact, vitamin D is often linked to immune function and energy levels in sufficient amounts, making deficiency less likely to support these benefits. Therefore, the relationship between vitamin D deficiency and increased fracture risk is well established and highlights the importance of maintaining adequate levels of this essential nutrient for bone health.