A head-sized lump of fermented culture grown only inside Wall Sheena, yeast quietly underpins food security within the Walls. Stockpiled beside grain and cured meat, it slows spoilage through a process no one inside the Walls can scientifically explain.
Yeast is a crop unique to Wall Sheena, the innermost of the three Walls. Unlike weapons or gear, it plays a purely passive role in human survival: keeping stored food from rotting. Its existence is documented through the Currently Publicly Available Information notes accompanying the manga.
Each batch looks like a mass of fermented soybeans about as big as a human head. Storehouses and tents pack these lumps in alongside soybeans, wheat, and dry-cured meats, and their presence dramatically slows how quickly those provisions decompose. Stranger still, the goods sharing storage with the yeast appear to be transformed by it in some way, through means that the science of the Walls cannot yet account for.

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In Attack on Titan, yeast is a crop used for food preservation, packed alongside stored provisions to slow how quickly they rot.
Attack on Titan's yeast is unique to Wall Sheena, the innermost of the three Walls, where it is cultivated and distributed among preserved goods.
Each batch of yeast in Attack on Titan looks like a mass of fermented soybeans about the size of a human head.
Storehouses and tents pack yeast in alongside soybeans, wheat, and dry-cured meats, dramatically slowing how quickly those provisions decompose.
No individual character is tied to yeast; it is handled by the food producers and storehouse keepers of Wall Sheena, where it sustains the population behind the Walls.
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