Judy, the more fat in your bread, the longer it'll stay fresh. That said, most sourdough breads seem to be rather low in fat - though luckily, sourdough breads stay fresh longer than "straight" breads. Your best bet isn't to add something to the bread to preserve it; but rather to slice it into slices once it's cool, and freeze any of it you're not going to use within a day or so. It's easy to remove however many slices you want from the freezer and toast them - either just to thaw, or until they're toast. Warming bread helps restore it to its original freshness. Hope this helps - PJH

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