Can Freezing Bread Lower Its Glycemic Impact?

Can Freezing Bread Lower Its Glycemic Impact?

Yes—freezing bread before eating it can actually reduce its impact on your blood sugar. This surprising benefit comes down to how freezing alters the structure of starches in bread.

What Happens When You Freeze Bread?

When bread is frozen and then reheated (especially toasted), some of the starches in the bread undergo a transformation. They become what’s known as resistant starch—a type of carbohydrate that resists digestion in the small intestine. Instead of being quickly broken down into glucose (sugar), resistant starch behaves more like fiber, slowing digestion and leading to a lower glycemic response.

What the Research Says

Several peer-reviewed studies support this effect:

• A 2008 study in the European Journal of Clinical Nutrition tested white bread in four forms: fresh, toasted, frozen and defrosted, and frozen then toasted. The frozen-then-toasted bread produced the lowest glycemic response, significantly lower than fresh bread.

• A 2023 study published in Novelty in Clinical Medicine confirmed that freezing and reheating white bread led to a slower rise in blood sugar in healthy individuals. The researchers attributed this to the increase in resistant starch after freezing.

How to Try It at Home

If you want to reduce the glycemic impact of your bread:

1. Slice bread (I love this slicer! It makes the job quick and easy)

2. Freeze your bread after baking or buying. These freezer bags work perfect.

3. Reheat it before eating—toasting is especially effective.

4. Enjoy as usual, knowing you’re helping your body process it more slowly.

This technique works best with white or refined breads, but even whole grain or sourdough loaves may benefit. It’s a simple, science-backed way to make your bread a little friendlier to your blood sugar.

References

• Burton, P., & Lightowler, H. J. (2008). The impact of freezing and toasting on the glycaemic response of white bread. European Journal of Clinical Nutrition, 62(5), 594–599.

• Novelty in Clinical Medicine (2023). Effects of Freezing and Reheating on Glycemic Response to White Bread.