Mess and Malnourishment

From the introduction: Sea rations and se borne illnesses in the Forgotten Realms and beyond. ... This supplement is meant to be used in conjunction with the optional crew rules that are laid out on page 196 of Ghosts of Saltmarsh and is meant to provide more realistic mechanics in terms of the types of malnourishment related diseases that can occur on board ships during the normal course of sea travel.