PREHEAT the oven to 350°.
GREASE the inside of a 9-by-5-inch loaf pan using cooking oil spray; LINE the bottom with parchment paper.
In a large mixing bowl, COMBINE the whole-wheat and bread flours, baking powder, baking soda, salt, oil, honey, molasses and buttermilk.
STIR until all dry ingredients are moistened, about 1 1/2 minutes.
POUR into loaf pan, SPREADING the batter evenly.
BAKE (middle rack) until the top is evenly browned and a toothpick inserted into the center comes out clean, about 40 to 50 minutes.
REMOVE from pan; PLACE on wire rack; COOL for at least 10 minutes before serving.
1. May substitute all-purpose flour
Per Serving (excluding unknown items): 181 Calories; 5g Fat (25.3% calories from fat); 4g Protein; 31g Carbohydrate; 2g Dietary Fiber; 1mg Cholesterol; 270mg Sodium. Exchanges: 1 Grain(Starch); 0 Non-Fat Milk; 1 Fat; 1/2 Other Carbohydrates.