It matters because high blood sugar isn't great for the body (nor is low blood sugar). A normal, non-diabetic's blood sugar might spike to 120/130 after a balan

It matters because high blood sugar isn't great for the body (nor is low blood sugar). A normal, non-diabetic's blood sugar might spike to 120/130 after a balanced meal. But that same person's blood sugar might spike up to 160/170 after something carb-heavy. So sure, the body corrects for it - but it would be healthier if it didn't go into that higher range at all.