You know you can use applesauce instead of oil, but in this recipe I revved up the strawberry flavor in the cake with strawberry puree. You can use a fruit puree to replace the total liquid volume that a cake mix calls for (I find that fruits with a high water content work best; bananas might not work so well). And using only egg whites cuts down on fat and cholesterol. Try this with any cake/fruit flavor to seriously cut down on calories.