While sourdough bread, especially made with whole grains, may cause a slower rise in blood sugar compared to white bread, it still affects glucose levels, emphasising portion control and balanced meals for diabetics.
Sourdough bread can still raise blood sugar, but it may do so more slowly than standard white bread, according to Diabetes Daily. The key issue is that it remains a carbohydrate-rich food, so the amount eaten matters as much as the type of loaf. A typical serving of two thin slices contains about 25g of carbohydrate, and nutrition experts say the effect on glucose can vary depending on the flour used, the size of the portion and what else is on the plate.
The article cites Grace Derocha, a registered dietitian and diabetes care specialist, as saying that sourdough made with whole grains is likely to have a gentler impact than a version made mostly with white flour. Fermentation, she said, may slightly improve digestibility and mineral availability, but it is not a reason to treat sourdough as a health food. Morgan Beemiller, another dietitian quoted by Diabetes Daily, said sourdough can still fit into a diabetes-friendly eating pattern when it is made with quality ingredients and eaten in sensible portions.
For people trying to keep blood sugar steadier, the practical advice is to treat sourdough as the starch in a meal and balance it with protein, healthy fats and vegetables. Diabetes Daily suggests combinations such as eggs and tomatoes, avocado and smoked salmon, or nut butter with fruit. An open-faced sandwich can also help keep carbohydrate intake down. The bigger risk comes from loading bread with jam, honey or sugar-sweetened drinks, which can push glucose higher more quickly.
Disclaimer: This content is for informational purposes only and is not intended to be a substitute for professional medical judgment, advice, diagnosis, or treatment.
