Sourdough bread
Low GI
GL 18.8 per piece (70 g) · GL 26.8 per 100 g
- Sourdough fermentation gives a lower GI, about 54, than white yeast bread at about 75.
- Made from refined wheat flour: only about 2 g of fibre per 100 g.
Sourdough bread has a glycemic index of 54 (Low). One piece (70 g) adds a glycemic load of 18.8.
Reviewed Jul 31, 2026 · Sources: USDA FoodData Central #172675 , Logi Nutrition Team · Not medical advice · Report an error
Instead of this
- GL 21 per 100 g Rye sourdough bread is eaten the same way, with more fibre and a lower glycemic load than wheat sourdough.
Sourdough rye bread - GL 18 per 100 g Sprouted grain bread makes the same sandwich or toast with more fibre and a clearly lower glycemic load.
Sprouted bread - GL 14 per 100 g Flaxseed bread fills the same role with fewer carbohydrates and a glycemic load about half as high.
Flaxseed bread - GL 6 per 100 g High-protein bread gives a slice with about twice the protein and far fewer carbohydrates.
High protein bread
Forms of Sourdough bread
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Sourdough bread is one of the 11,150 foods Logi scores when you photograph a meal — with the portion.
Portions
| Portion | Grams | GL |
|---|---|---|
| 1 slice, small | 34 g | 9.1 |
| 1 slice, medium | 70 g | 18.8 |
| 1 slice, large | 104 g | 27.9 |
Nutrition Facts (per 100g)
per 100g
| Calories | 272 kcal |
| Carbohydrates | 51.88 g |
| Sugars (Total) | 4.62 g |
| Natural | 4.6 g |
| Added | 0 g |
| Fiber | 2.2 g |
| Soluble | 0.7 g |
| Insoluble | 1.5 g |
| Protein | 10.75 g |
| Fat | 2.42 g |
| Saturated | 0.48 g |
| Unsaturated | 1.94 g |
| Sodium | 500 mg |
Processing Level
Why this score?
- Sourdough fermentation gives a lower GI, about 54, than white yeast bread at about 75.
- Low in fat: about 2.4 g per 100 g.
- About 11 g of protein per 100 g.
- Made from refined wheat flour: only about 2 g of fibre per 100 g.
- Glycemic load of about 28 per 100 g.
- About 600 mg of sodium per 100 g (around 1.5 g of salt).
Calculate the glycemic load of a meal with Sourdough bread
Allergens
Low-GI recipes on Logi Food Coach
Frequently Asked Questions
What is the glycemic index of Sourdough bread?
Sourdough bread has a glycemic index of 54 (Low). One piece (70 g) has a glycemic load of 18.8; per 100 g the glycemic load is 26.8.
Is Sourdough bread good for people with insulin resistance?
Sourdough bread has a low glycemic index (54), making it a good option for people with insulin resistance. It causes a slow, gradual rise in blood sugar.
Which form of Sourdough bread has the lowest glycemic load?
Among the forms of Sourdough bread in this database, High protein bread sourdough has the lowest glycemic load (16 per 100 g).
Check Sourdough bread in the Logi app, with your portion.
