I've used brown sugar in this recipe with excellent results. I've also substituted 1 cup of flax flour for 1 of the cups of all-purpose flour with fantastic results. Remember that flax expands, so get out a couple extra loaf pans. Adding flax flour is a great way to increase your yield without increasing your time in the kitchen. You may also add nuts (pecans, walnuts, or pistachios) to the batter when you add the zucchini and dates, if desired.