And the article said people are failing to control their blood sugar level because they are failing to test four times a day or more. Why does testing your blood four or more times a day control your sugar levels? If you eat some food and your reading is high what, at that stage, can you do about it? Go to the toilet and stick your fingers down your throat and adjust your food intake that way.. Would your blood sugar level be under even better control if you test 30 times a day ? Or 40 ? How about testing between every mouthful of food. .