How do high blood sugar cause potassium depletion?

Sugar and potassium: Insulin is required for potassium (k) to enter the cells along with glucose (g). If one has high g levels, there is a shortage of effective insulin. K stays in the blood, out of the cells, and it is eliminated in the urine, by an osmotic diuresis due to the high g level. Once g levels are controlled, with insulin, both g and k go into the cells of the body and the osmotic diuresis is ended.