trapped traders will not eat their food

[matthiaskrgr]

Trapped (walled-in) traders will go berserk from malnutrition even if they have meals in their inventory.

When one of the berserkers is downed and drops his food, fellow faction members will not touch/eat this food but instead continue wandering around malnourished.

[Tynan]

This is by design; it prevents them stealing players' food.