Special Rule: At this point it is not possible for PCs to purchase any food items, including trail rations onto their character sheet.
Additionally, magic items that provide nurishment, such as Ring of Sustainance, wands of Create Food and Water and Sustaining Spoon have doubled in value, meaning PCs can sell them for the full Core Rulebook value or buy them for twice the Core Rulebook value.
The game rules for starvation for the moment do not yet apply to PCs, but this may change in the future.
See also the rumour in the rumours board and the announcement about the upcoming Siege Finale!