08/27/2026
We’ve always recommended freezing bread if you’re not going to finish the loaf within a few days because we don't add any preservatives.
🌾Sourdough freezes beautifully, and it’s an easy way to keep a good loaf from going to waste.
Turns out, there may be another benefit to it! 🤗
A small study published in the European Journal of Clinical Nutrition looked at what happened to blood sugar after people ate the same white bread prepared in different ways: fresh, frozen and thawed, toasted, OR frozen, thawed and then toasted.
The biggest difference was with the homemade bread that had been frozen, thawed and toasted. The two-hour blood glucose response was about 39% lower than when the bread was eaten fresh! 🌾
Interestingly, toasting alone also made a meaningful difference. And the results weren’t identical with commercial bread, which is important context when you see the “39% less” claim floating around online.
Researchers believe changes in the starch structure during cooling may help explain the effect. As cooked starch cools, some of it can become more resistant to digestion. This particular study didn’t measure resistant starch directly, though, so we can’t say exactly how much of the difference came from that process.
And because we’re a sourdough bakery, one important clarification: the study was done on white bread, not naturally fermented sourdough. Natural fermentation alone adds a ton of other benefits!
If you want to try it at home, slice your loaf before freezing it or buy our already sliced bread 😉. Take out a slice or two whenever you need them and toast them. Easy, less wasted bread, and you don’t have to race through an entire loaf while it’s fresh.
We may be delivering to your area 🙂
www.breadstreetboys.com or download our app.
Burton & Lightowler, European Journal of Clinical Nutrition, 2008.