Rickets is the softening and weakening of bones in children, usually because of an extreme and prolonged vitamin D deficiencyvitamin D deficiencyFor most adults, vitamin D deficiency is not a concern. However, some groups — particularly people who are obese, who have dark skin and who are older than age 65 — may have lower levels of vitamin D due to their diets, little sun exposure or other factors.
› expert-answers › faq-20058397Vitamin D deficiency - Mayo Clinic.Feb 25, 2021