A system and method for actively managing Type 2 diabetes mellitus on a personalized basis is provided. A model of glycemic effect for a Type 2 diabetic patient for digestive response is established. The digestive response model is adjusted for a degree of insulin resistance experienced by the patient. A rise in postprandial blood glucose through food ingestion of a planned meal is estimated in proportion to the adjusted digestive response model. The tool also allows for the avoidance of hypoglycemic episodes by medications.