It is not just the sugar in bread that raises bgs but other ingredients. For some of us the wheat flour by itself is enough to raise our bgs a lot. If you need to eat bread look for the kind where you can see the whole grains in it. The least processed the bread the better it is for you. Personally , I choose sprouted grain bread that has no wheat flour in it at all. The sugar that gets added to a lot of bread is used with the yeast to make it rise. That is why a lot of the breads without sugar may be much shorter and denser.