1 choose your foods learn to match your insulin to your carbs learning how food insulin and physical activity work together to affect blood glucose blood sugar can help you better manage your diabetes foods that contain carbohydrates carbs raise your blood glucose insulin and low to moderate physical activity lower blood glucose. Your carb ratio is often initially set by your doctor when you are diagnosed but should be updated regularly if needed a carb ratio of 110 means that that 1 unit of rapid acting insulin will cover 10 grams of carbs a higher ratio indicates that you need less insulin to cover your carbs let me give you an example. An insulin dosing worksheet is provided for the diabetes educator to personalize a clients blood glucose target and insulin plan and it shows a stepwise approach for calculating mealtime insulin this booklet is an excellent follow up to choose your foods count your carbs take a look inside with these free sample pages published 2019. How to use your insulin to carb ratio add up the total number of carbohydrate grams in a meal divide the total number of carbohydrate grams by your insulin to carb ratio inject the insulin needed to match your carbohydrate intake