Colorful sweets may look tasty, but some researchers question whether synthetic dyes may pose health risks to your colon and rectum Posted byLorne J. Hofseth December 9, 2021 Leave a comment on Colorful sweets may look tasty, but some researchers question whether synthetic dyes may pose health risks to your colon and rectum Sixty percent of the Standard American Diet consists of ultra-processed food, which isn’t great for colon health. Researchers are looking into whether artificial food colors play a role.