While in Hueco Mundo, most hollows can sate their hunger simply by breathing the reishi-rich air, and are threatened only by other hollows who have turned to cannibalism, conquest for power and sport, or both.
In Hueco Mundo, most hollows can satisfy their hunger by breathing the reishi-rich air, and are threatened only by other hollows who have turned to extreme measures like cannibalism, power grabs, or a combination of these factors.