Does freezing bread actually lower the glycemic index for diabetics?

Hey Marcus, I totally get the sandwich struggle! The short answer is yes, but with a little bit of a catch.

When you freeze bread and then toast or thaw it, the extreme temperature change actually alters the molecular structure of the starches inside the dough. It turns a portion of the regular, fast-digesting starch into something called "resistant starch."

Resistant starch acts a lot like fiber in your gut. Your body can't break it down easily, which means it digests much slower. Because it takes your system longer to process, it doesn't dump a massive load of glucose into your bloodstream all at once. Several nutritional studies have actually shown that freezing and then toasting bread can noticeably lower its glycemic impact compared to eating it fresh off the grocery store shelf.

However, the catch is that this trick doesn't turn bread into a zero-carb, free-for-all food. It’s still bread, and it will still raise your blood sugar—just hopefully a bit less aggressively. If you want to try this out, your best bet is to start with a loaf that is already whole-grain, seeded, or sourdough (since sourdough naturally has a lower glycemic response anyway). Slice it, freeze it overnight, and pop a piece straight into the toaster when you're craving a sandwich. Just be sure to test your numbers two hours after eating to see how your unique body handles the resistant starch!