Sourdough Bread
Fermentation lowers the glycemic response compared with standard white bread.
FatTonic Facts
Sourdough Bread · per serving 1 slice (50g)
Good · supports fat-burning
| Factor | Amount | Points |
|---|---|---|
| Start | 100.0 | |
| Glycemic load | 13 | −28.6 |
| Sugar (g) | 2 | −1.6 |
| Processing | processed | −16.0 |
| Fiber (g) | 2 | +3.2 |
| Protein (g) | 5 | +3.5 |
| Glycemic index | 54 | |
| Carbs (g) | 26 | |
| Fat (g) | 1 |
Score model v1
Nutrients: USDA FoodData Central, record 172675 (Bread, french or vienna (includes sourdough)), public domain, checked 2 Oct 2026.
Glycemic index: per-food source not yet recorded.
Per 100 g (USDA record; serving 50 g): carbs 51.9, sugar 4.6, fiber 2.2, protein 10.8, fat 2.4 g.
What this means for fat-burning
Why this score: glycemic load 13 set it, −28.6 points. Source: USDA FoodData Central, FDC 172675.
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Among the 200 rated foods
Sourdough Bread scores 61, rated Good. It scores higher than 35% of the 200 rated foods.
Rated foods per band: Avoid 0–19: 11; Poor 20–39: 23; Moderate 40–59: 34; Good 60–79: 45; Excellent 80–100: 87.
Frequently asked questions
Does sourdough bread spike insulin?
Glycemic load 13 for 1 slice (50g); FatTonic Score 61/100 — it supports fat-burning.
Is sourdough bread good for fat loss?
Good (61/100): sourdough bread supports fat-burning.