There are some low carb breads available from supermarkets or health food shops which may be a better option, or you can bake your own - check the forum low carb recipes section, or ask Google for recipes. I use a low carb, gluten free, ready mix from Sukrin which is about 1-2g carbs a slice. And it's idiot proof in that you just need to mix with water and bake. It's quite expensive, but you can't really eat much at a time as its quite filling. Making your own from scratch with almond, coconut or sesame flour, etc, will be a fair bit cheaper but a little more time consuming.
Robbity