Vitamin D is an essential micronutrient that is suspected to display an important role on normal fetal development, and throughout the life of the child and future adult. Its role in calcium and phosphate metabolism is well-established and it also appears to be involved in many other physiological processes, 1 including control of adipose tissue biology. 2-9 Consequently, vitamin D insufficiency is considered as a risk factor in several pathologies, including auto-immune