In view of the finding that keeping a healthy body is fundamental for overcoming cancer, it is an object of the present invention to provide a nutritious composition that is effective in suppressing mutagenic substances and promoting good health. The composition also suppresses large intestinal cancer. The composition includes dietary fiber in a range of 15 wt % to 30 wt % in respect to the total amount of composition which is contained in dried koji fine powder that includes dead fungi of Aspergillus and active enzyme produced by the Aspergillus.