Vitamin D is an important factor for metabolic health, immune function, and hormonal regulation. People who are obese frequently have lower circulating levels of vitamin D, in part related to sequestration of vitamin D in adipose tissue. Vitamin D deficiency has been associated with obesity-related insulin resistance, decreased glucose metabolism, and increased risk of developing metabolic syndrome. Improving one's vitamin D status and/or supplementation may help aid in weight management, improve metabolic health and outcomes, and improve overall health. Understanding the relationship between vitamin D process and obesity is important for developing dietary-based strategies and public health interventions related to obesity-related health complications and metabolic health.