Why are deficiency disease caused?

Answer 1

A deficiency is a lack or shortage, therefore deficiency diseases are caused by a lack or shortage of necessary nutrients in the body. One example is scurvy, a disease associated with pirates that occurs when an individual suffers from a vitamin C deficiency.

Answer 2

A deficiency disease is one that is caused by a lack of some nutrient, vitamin, or mineral. The most well known of these is scurvy from a deficiency of vitamin C.