A student diagnosed with Diabetes mellitus at a local clinic fails to continue with his treatment plan as a result of inadequate funding &decides to go home. Two months later, a patient was reportedly brought in to the clinic with complains of a reduced amount of urine, swelling of the legs, ankles, and feet from retention of fluids caused by the failure of the kidneys to eliminate water waste. The attending physician recognized the patient as the student that came in two months ago diagnosed with Diabetes mellitus.

What is the correlation between these two conditions?