There are two types of diabetes: Diabetes Insipidus and Diabetes mellitus. In both the forms, large amount of urine is expelled from the body. The condition is known as polyuria. Diabetes Insipidus (DI), is either a neurological disorder or a nephrological disorder in humans. --In the neurologic disorder, vasopressin deficiency is there. Vasopressin is the hormone which is released when there is less water in our body. This hormone absorbs all water from the urine and leaves highly concentrated urine for excretion. This hormone is not released when large amount of water is already there in the body. --In the nephrologic disorder, vasopressin is there but the kidney\'s/nephron\'s response to vasopressin is negligible. In Diabetes Mellitus, excess sugar is leaked in the blood, which in turn absorbs excess water from the body, and releases this water in the urine. This condition is known as osmotic diuresis. In all forms of diabetes, a person feels very thirsty; so, he/she will drink large amount of water. And because of deficiency of vasopressin, this excess water will not be absorbed. So, such a patient produces greater volume of dilute urine. Solution There are two types of diabetes: Diabetes Insipidus and Diabetes mellitus. In both the forms, large amount of urine is expelled from the body. The condition is known as polyuria. Diabetes Insipidus (DI), is either a neurological disorder or a nephrological disorder in humans. --In the neurologic disorder, vasopressin deficiency is there. Vasopressin is the hormone which is released when there is less water in our body. This hormone absorbs all water from the urine and leaves highly concentrated urine for excretion. This hormone is not released when large amount of water is already there in the body. --In the nephrologic disorder, vasopressin is there but the kidney\'s/nephron\'s response to vasopressin is negligible. In Diabetes Mellitus, excess sugar is leaked in the blood, which in turn absorbs excess water from the body, and releases this water in the urine. This condition is known as osmotic diuresis. In all forms of diabetes, a person feels very thirsty; so, he/she will drink large amount of water. And because of deficiency of vasopressin, this excess water will not be absorbed. So, such a patient produces greater volume of dilute urine..