a vitamin d deficiency occurs when the body does not take in enough of the vital nutrient, either from diet or exposure to sunlight. this deficiency, which is most common among people over the age of 65, can lead to serious issues, including osteoporosis, loss of bone density and broken bones.
vitamin d plays a key role in human health,
according to health canada
, by helping the body regulate calcium, a mineral it uses to build and sustain strong bones and teeth. it also plays a critical role in the proper functioning of the immune system, the nervous system and the musculoskeletal system.
according to the cleveland clinic
, the body struggles to use calcium and phosphorous to build bones and keep tissues healthy when vitamin d is in short supply. if the body’s intestines lose the ability to absorb these two minerals, symptoms — including muscle weakness, cramps and depression — can ensue. if the body begins to pull calcium from bones to compensate, more problems may occur.
a vitamin d deficiency can also be caused by certain medical conditions, including cystic fibrosis, crohn’s disease, celiac disease, kidney disease, liver disease and
obesity. some medications can contribute to lower levels of the nutrient, including laxatives, steroids, cholesterol-lowering drugs, seizure-control drugs and some weight-loss drugs.