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Which bread is low to medium glycemic? - sourdough bread glycemic index

I read this book on weight loss glycemic index (I) an imbalance of insulin. The book says that I can eat sourdough (the acid neutralizes the sugar by 30%) and other small loaves average blood sugar levels. Therefore, they should be less than 60 years or less at the level of glycemic control. Is there a decent tasting bread that fall into this category? I'm not a fan of sourdough.