Does over Proofed Bread Taste Bad?

You'll end up with a loaf that doesn't expand or bake well, and that is also misshapen and very sour. While some people (including us) like that biting flavor, others may find it too sour. Mistakes are inevitable when it comes to proofing bread, but there's no need to throw out dough if it proofs too long.

Can you eat over proofed bread?

If you bake the dough "as is," it will likely collapse significantly in the oven and be rather dense. Chances are the dough will taste a bit odd after baking -- overly "yeasty" or "beer-like," with some "off" flavors. It won't be completely inedible, but it probably won't taste great.

What happens if you let bread proof too long?

If you let the dough rise for too long, the taste and texture of the finished bread suffers. Because the dough is fermenting during both rises, if the process goes on for too long, the finished loaf of bread can have a sour, unpleasant taste. ... Over-proofed loaves of bread have a gummy or crumbly texture.