What is the role yeast plays in bread making?

As the yeast feeds on sugars during the raising process, it creates small air pockets- this is what makes the bread increase in size (or 'rise'). Whitout yeast or another rasing agent the bread would be flat and dense.

First answer by Jillybeans. Last edit by Jillybeans. Contributor trust: 47 [recommend contributor]. Question popularity: 37 [recommend question]

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