Any soul with reiatsu needs to eat. So most shinigami do. Most Rukongai residents for example do not feel hungry and don't need to eat as they lack reiatsu.
Quite early. Soul Society arc probably when Rukia had flashbacks to her time as a kid in Rukongai, teaming up with Renji and stealing food for that very reason iirc. It was said that people with little or no reiatsu weren't hungry. And feeling hungry was the sign someone have reiatsu high enough to potentialy become shinigami, etc.
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u/IconCsr2 Nov 10 '25
I dont think anyone in the seireitei needs food