I highly recommend reviewing the Monash fodmap app for a list of low FODMAP sourdough bread types and brands, including those made with spelt and wheat. If you have celiac disease or non-celiac gluten/wheat sensitivity, make sure your sourdough bread is gluten free. Schar has a gluten free deli style sourdough bread. And, I really like Cook's gluten free sourdough bread, made here in San Diego.