The Swiss team created new three-dimensional images of the ancient traveler's dentition. These showed that the Iceman suffered a blunt force trauma to two teeth-possibly a blow to the mouth-at least several days before his death and was plagued by both periodontal disease and cavities. The cavities, Seiler said in his talk, confirm that the Iceman ate a diet abounding in carbohydrates, such as bread or cereal, and reveal that he possessed a "heavy bacterial dose on these teeth."
To summarise, the iceman of roughly 3000BC was eating a diet based around carbohydrates including breads and cereals.
This appearing to be a contributing factor to his poor dental hygiene, of which he was suffering from periodontal disease and cavities.
To me it sounds like mountain ice man should have picked a better trail mix