Move oven rack to low position so that tops of pans will be in the center of the oven. Pre heat oven to 350 degrees F.
Grease bottoms ONLY of 2 loaf pans.
Mix sugar and butter in large bowl.
Add eggs and mix until blended.
Add bananas, buttermilk and vanilla. Beat until smooth.
Stir in flour, baking soda and salt until flour mixture is just moistened.
If you choose to add nuts do so at this time.
Pour into your greased pans and bake for about 1 hour or until toothpick inserted into the center comes out clean. Cool for 10 minutes. Loosen sides of loaves from pans and cool on a cooling rack for at least two hours before cutting to retain moisture.