[wbill]

add sugar to their pizza dough .....Yeah, you need to give the yeast something to gnaw on. I put 2 tablespoons in 3 pizza's worth of crust. Doesn't take much.

I'd imagine that the chains add quite a bit more than that. Sugar, salt, fat all taste good.

[9YearLurker]

Yes, if you eat whole foods rather than processed, pretty soon most commercial and processed foods start to taste awfully sweet and salty!