% 100 Unmodified rye flour
Rye bread also contains small amounts of zinc, pantothenic acid, phosphorus, magnesium, calcium, and other micronutrients. Compared with regular breads, such as white and whole wheat, rye bread is typically higher in fiber and provides more micronutrients, especially B vitamins ( 1 , 2 , 3 ).
Sourdough is made through a fermentation process that relies on naturally occurring yeast and bacteria to make the bread rise.Sourdough may also be easier to digest than other breads, possibly due to its prebiotics, as well as the probiotics created during the fermentation process. Sourdough bread is thought to have a low glycemic index (GI), a measure of the impact a food has on blood sugar.