Scavenging Gullet( Lords of Madness, p. 181)
The taint of the aberration in your blood has gifted you with the ability to gain nourishment from things that others would never consider as food.
Aberration Blood (LoM) ,
You gain nourishment from eating any organic material, despite its freshness or source. You gain a +4 racial bonus on Fortitude saves to resist the effect of ingested poisons, as well as on Fortitude saves to resist diseases caused by ingested substances (such as spoiled food).