Stroll through the prepackaged bread aisle of any U.S. grocery store and look at the sugar content on the nutrition labels.

At my local Safeway, the generic brand 100% whole wheat bread contains 4g of sugar per slice. With 16 slices in a pack, that’s a third cup of sugar per loaf.

The ingredients? Whole wheat flour, water, sugar, wheat gluten, honey, brown sugar, yeast, oil, salt, …