Sour dough fermentation uses bacteria as well as yeasts. The Bacteria digest the gluten and the yeasts are limited by the amount of sugar that is present. So sourdough bread is superior to modern yeast leavened bread from a health perspective because the bacteria have pre-digested the proteins that give us trouble, in the same way that yogurt is superior to milk because it is pre-digested by the lactobacillus. The downside is that the proving (rising) process is slower with SD.
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