Poop Decks?

Recent studies on Medieval latrines in Jerusalem and Riga have confirmed that Archeologists can learn much about the diets, gut bacteria and diseases of our ancestors from such locations (https://www.theguardian.com/science/2020/oct/09/scientists-hands-dirty-research-medieval-poop-microbiomes). It seems that, in such shared locations, bacterial DNA can survive for hundreds of years, as can the remnants of parasitic worms, remains of food etc. This not only give us information about living conditions and diets in times gone by, but might also indicate why some gastrointestinal problems seem more common in modern times (they could be related to changes in our gut's bacterial flora). Gives a new meaning to the phrase 'deep down and dirty'.