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A 43-year-old man with poorly controlled type 2 diabetes is admitted to the emergency department. Serum glucose is 564 mg/dL and serum potassium is 4.1 mEq/dL; he is started on IV insulin and fluids. Repeat labs one hour later show hypokalemia, with K of 3.2 mEq/dL. What process resulted in the rapid drop in this patient’s serum potassium levels?