Final answer:
Diabetes insipidus is caused by a lack of vasopressin, which is a hormone that helps regulate the body's water balance.
Step-by-step explanation:
Diabetes insipidus is caused by a lack of vasopressin, which is a hormone that helps regulate the body's water balance. Vasopressin is produced in the hypothalamus and stored in the pituitary gland. When there is a deficiency of vasopressin, the body is unable to properly regulate the amount of water excreted through urine, leading to excessive thirst and urination.
Learn more about Diabetes insipidus