Certain populations are more susceptible to vitamin D deficiency, including individuals with limited sun exposure, such as those living in higher latitudes, wearing protective clothing, or using sunscreen consistently. Older adults, people with darker skin, individuals with certain medical conditions like celiac disease, Crohn's disease, or those who have undergone gastric bypass surgery, and individuals with obesity are also at higher risk. Additionally, breastfed infants who do not receive vitamin D supplementation may be at risk.
