Gram-for-gram, sourdough bread has less calcium than white bread, pita bread, and wheat bread. A 28-gram serving of sourdough from Panera has 10.4 milligrams of calcium compared to the 40 ...

Arora K, Ameur H, Polo A, Di Cagno R, Rizzello CG, Gobbetti M. Thirty years of knowledge on sourdough fermentation: a systematic review. Trends Food Sci Technol. 2021 ...