Using a large mixing bowl, sift the flour and sugar and mix together. In a separate bowl, mix the pineapple, eggs, oil, and add to the flour mixture, mix well. Fold in the cheese, nuts and pineapple extract. Pour mixture into a greased 9 by 3 inch loaf pan. Bake for 1 hour. Cool and turn out bread from pan. Allow to cool completely before slicing.