Preheat oven to 350 F. Spray a loaf pan with non stick spray.
In a large bowl, mix flours, sugar, baking powder, baking soda, salt and ginger. Mix well.
In a small bowl, whisk together buttermilk, egg, oil and vanilla. Mix well.
Add to dry ingredients and mix well. Add walnut meal and mix well.
Using a rubber spatula, fold in carrots.
Place in prepared pan. Bake for 1 hour.