OK, this may have come up and I just didn't check because I don't bake very often. But, when I bake banana nut bread (nearly the only thing I ever bake) why doesn't the loaf rise to normal size? I follow the recipe from the Joy of Cooking, I set the right temperature (I believe) at 165 C. The bread still tastes good, but it's a little dense and not as big and fluffy as it should be. It essentially only rises halfway, instead of rising to the top of the loaf pan. What am I doing wrong?