This is bread made by fermenting the dough using wild lactobacillaceae and yeast. It has a sour taste. 

This bread is approved by the nutritionist Deepsikha Jain. She says it is better than regular bread as it has lactic acid. 

Thanks to the presence of lactic acid bacteria, sourdough bread is actually good for gut health. 

Unlike regular bread, sourdough bread is more nutritious due to its fermentation process. 

As sourdough involves a slow fermentation process, it is easier to digest compared to regular bread.