keep in mind that white flour IS wheat flour, there's no real difference. read over the wiki entry for "wheat flour" for more on this.
as for multi-grain breads, i guess it depends on what kind of grains they are, but you can always guarantee there's plain old wheat flour in a 7-grain bread. i happen to have a wheat allergy. it gives me irritable bowels on the rare occasions that i do eat it, and if i keep going long-term with it, i develop pain in my joints. =(
otherwise, i can happily eat grains like rice, millet and flax, just to name a few, but i find the sprouted breads to be allot tastier and they have a decent texture for sandwiches. =)