Dr. Ponder is a pediatric endocrinologist & type 1 PWD. He makes some very good sense in this article: Use blood-sugar testing to reach goals | blood, sugar, most - DR. PONDER - Odessa American Online
Excerpt: The goal of all diabetics is to minimize the flux in their blood sugar readings and make their sugar patterns look more like a nondiabetic person. Therefore, everything you are taught as a diabetic and all the supplies and medications you are prescribed should be applied as tools or strategies to achieve this result. Use your tools to reach that goal each and every day to the best of your abilities. But since a blood sugar reading by itself is much like a single frame from a motion picture, the smart diabetic knows that these pieces of information can and should be put together to form a bigger picture of their overall diabetes control.
There are some important time points when a sugar check is more likely to give useful information. The first is before eating meals and snacks. Food is almost always going to increase blood sugars. Knowing how much your blood sugars rise with food can empower you in making better choices with medication doses, such as insulin, and better food choices. The second crucial time to check sugar is after eating, between two and three hours after finishing the meal to be precise. In nondiabetics, the blood sugar two to three hours after eating is always under 140 mg/dl. While such a tight target is not always reachable with all diabetics, it’s still something to aim for. I often suggest that readings at the two to three hour time point aim for under 180 mg/dl or less. But readings under 70 mg/dl would be considered too low at this point in time.