Preheat your oven to 350°F (175°C). Grease a 9x5-inch loaf pan or line it with parchment paper for easy removal.
In a medium bowl, whisk together the flour, baking soda, baking powder, salt, cinnamon, and nutmeg. Set aside.
In a large mixing bowl, combine the granulated sugar, brown sugar, and vegetable oil. Mix until well combined.
Add the eggs and vanilla extract to the sugar mixture, and beat until smooth.
Gradually add the dry ingredients to the wet ingredients, mixing just until combined. Do not overmix.
Fold in the grated zucchini, crushed pineapple, and nuts (if using) until evenly distributed.
Pour the batter into the prepared loaf pan and smooth the top with a spatula.
Bake in the preheated oven for 55-65 minutes, or until a toothpick inserted into the center comes out clean.
Allow the bread to cool in the pan for about 10 minutes before transferring it to a wire rack to cool completely.