Most frequently, a lack of sunlight exposure results in vitamin D u003ca href=u0022https://www.vitsupp.com/vitamin-d-deficiency-symptoms/u0022u003edeficiencyu003c/au003e. The deficiency may also result from certain disorders.  The most frequent reason for the deficiency is a lack of sunlight exposure, which typically occurs when the diet is lacking in vitamin D, but other medical conditions can also be to blame. Loss of bone density brought on by a u003ca href=u0022https://www.vitsupp.com/all-about-vitamin-d/u0022u003evitamin Du003c/au003e deficiency may increase the risk of osteoporosis and fractures. Your bones may become thin, brittle, or misaligned as a result. Additionally, the immune system and the production of insulin seem to be impacted by vitamin D. Other illnesses can also be brought on by severe vitamin D deficiency. In children, it can cause rickets. The rare disease rickets makes the bones brittle and prone to breaking. Allergies, asthma, and eczema in children are also linked to low vitamin D levels.