Yes, the VA should have a dietitian to help; or maybe even Diabetes Classes.
You will learn how to "count carbohydrates" and work them into your meals and snacks. Polenta is a carb food, 1/2 cup cooked is a standard portion with about 15 grams of carbohydrate.
Check out our SP Diabetes Center---we even have meal plans with carbohydrate control. www.sparkpeople.com/resource/diabetes-diet
SP Registered Dietitian Becky