Question about diabetes?

This guy I work with has diabetes and he checks his blood sugar every 2 hours. And most the time it is low, so he will eat something like fig newtons, chocolate chip cookies, coffee cake or fruit. I asked him what he eats for breakfast and lunch and he says cereal and sandwiches. If he didn't eat all those carbs and processed snacks, wouldn't his blood sugar be under control? Shouldn't he snack on foods with more protein and a small amount of carbs?