What is a likely outcome for a person with diabetes insipidus after consuming a large sugary beverage?

A person with diabetes insipidus has a deficiency in the hormone vasopressin (also known as antidiuretic hormone or ADH), which is responsible for regulating water balance in the kidneys. In the absence of vasopressin, the kidneys fail to reabsorb water effectively, leading to the production of dilute urine, characterized by a low concentration of solutes.

When this individual consumes a large sugary beverage, the influx of sugar may lead to a temporary increase in blood glucose levels. However, since they have diabetes insipidus, the crucial factor at play here is the impaired ability to concentrate urine caused by low levels of vasopressin. As a result, regardless of the high sugar content of the beverage, the kidneys will continue to produce a larger volume of dilute urine. This is because the body's mechanisms for retaining water are not functioning properly, leading to a situation where the urine remains less concentrated than normal.

Additionally, the osmotic load from the sugary beverage might lead to a further increase in urine output, but the fundamental problem of urine dilution remains at the heart of the physiological response in diabetes insipidus. Therefore, while the sweet drink could have various effects, the primary outcome in this scenario is the production of