Like "By testing before and after eating, say 2x ist after 1 hour and the 2nd time 2 hours after eating, you can see what the food you ate did to your BG, The sloppy joe, potato salad meal may have contained hidden carbs. 1 Tbsp of tomato paste (used in many tomato based sauces) has 3 grams of carbs. Salad dressing has about 1 1/2 grams of carbs per Tbsp. Testing will also show if potatoes spike your BG, the do mine as well as many other people with diabetes, So does popcorn..sigh. I know test strips are pricey. And finger pokes still make me flinch. But by testing I have cut out the cost of needing Diabetes meds, And the occasionally tingling in my toes when I ate the wrong foods is gone. "