Preheat oven to 180 °C (or 350 °F).
Grate zucchini in a bowl.
Add the bananas and squish everything.
Add the dry ingredients: chia seeds, flax meal, baking soda, baking powder, salt, flour, wheat bran and sugar.
Add the vegetable oil and the water. Mix well.
Stir in the chocolate chips and the walnut pieces.
Grease a loaf pan.
Fill the dough into the pan.
Put in the oven and bake for ca. 60 minutes.
Allow to cool before taking the bread out of the pan.