Preheat oven to 350. Spray a 4 x 8 1/2 inch nonstick loaf pan with nonstick spray.
With a wooden spoon, beat the sugar, and butter in a large bowl until creamy. Add the eggs, bananas, buttermilk, and vanilla; beat until combined. Combine the flour wheat germ, baking powder, baking soda, cinnamon, and salt in another bowl. Add the flour mixture to the banana mixture; stir just until blended.
Scrape the batter into the pan. Bake until a toothpick inserted in the center comes out clean, 45-55 minutes. Cool in the pan on a rack 10 minutes, remove from the pan and cool completely on the rack.