Technically, what makes a sour dough is using yeast from a previous bread making session but some bakers refer to slow rising bread as sour dough. There is a version of French bread I make that takes three days to rise, but the advantage is there is no yeast taste and slow rising breads stay fresh longer than fast rising bread. From a health perspective, slow rising breads break down the flour gluten, which makes it easier for the body to digest.
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