are you sure the 'whole' bun has only 3 carbs, kinda sounds unlikely. A bun typically is the size of two pieces of bread, so it seems it couldn't be half of two slice of LC bread. Although, I've not seen all the brands out for the LC bread items. I have trouble with adding any breads or cheese or artifical sweetners. If I eat those things, I expect to not loose anything (but not gain either luckily)