Place the lemon juice, oil, sugar, vanilla and soy milk in a medium mixing bowl and whisk.Then add the ground flax seeds. Sift the flour, baking powder and soda then stir well and add the blueberries. Mix gently with only a few strokes. Pour the batter into a lightly oiled loaf pan.
Bake the loaf for 45-55 minutes. If the blueberries are not fresh, then you have to bake for longer, say 1 hour 30 minutes.