Eating a bag of holding confers temporary intrinsic hunger, and eating a bag of tricks confers temporary intrinsic aggravate monster.

Famine’s attack gives you some amount of temporary intrinsic hunger in addition to the direct damage to your nutrition it already does.

Non-cursed rings of hunger don’t drain excess nutrition when you are Hungry, and slow digestion rings don’t slow your digestion when you’re oversatiated.

The hunger property, instead of doubling hunger rate, halves any nutrition you get from any source, making it marginally more useful for eating large corpses. (This should probably only be granted by the actual hunger intrinsic, i.e. the ring of hunger, as opposed to other intrinsics like conflict and regeneration that burn through nutrition fast but aren’t explicitly about being hungry.)