It is a natural starter. Sourdough relies on naturally occurring yeast and bacteria to make the bread rise
Average sourdough is higher in protein than white and brown bread
Less Phytates. One study found that sourdough fermentation meant the yeast would have 50% less phytates compared to using conventional yeast
Studies suggest it is healthy for your gut. Sourdough may be better if you have wheat sensitivity and be easier to digest than other breads, possibly due to its prebiotics, as well as the probiotics created during the fermentation process.
Average sourdough has less sugar than white and brown bread
Sourdough bread is thought to have a low glycemic index (GI), a measure of the impact a food has on blood sugar