1 slice (medium) of Sourdough Bread (40 g) has 100 calories. That works out to 250 calories per 100 g. It contains 19.2 g of carbs, 3.4 g of protein, 0.5 g of fat and 1.3 g of fiber. Its 196 mg of Sodium covers 9% of the Daily Value. Its glycemic index is 54 (medium), so it raises blood sugar at a moderate pace.

What is Sourdough Bread?

Sourdough Bread is made with flour, water and a fermented starter culture that leavens the dough over time. It is not tied to one place: versions of naturally leavened bread have long been baked in many food traditions. The crust is often crisp and deeply browned, while the interior can be airy and chewy, with a gentle tang that varies with the starter and fermentation.

It is commonly sliced for toast or sandwiches, served alongside soup, or paired with cheese and other savoury toppings; a good loaf also works simply with butter or olive oil. It is chiefly a carbohydrate source, with some fibre—3.2 g per 100 g. For a more balanced plate, pair a slice with vegetables and a protein-rich topping.

Sourdough Bread Nutrition Facts

Selected: 100 g

250

KCAL / 100G

Carbs

48g

· 17% DV

Protein

8.5g

· 17% DV

Fat

1.2g

· 2% DV

Fiber

3.2g

· 11% DV

DV is the share of the daily value covered, on a 2,000 kcal reference diet.

Calories come from: Carbs 81% · Protein 14% · Fat 5%

Sourdough Bread Vitamins & Minerals

Vitamins

0.22mg · 18% DV

2.1mg · 13% DV

Folate

32µg · 8% DV

0.08mg · 6% DV

Minerals

Manganese

1mg · 43% DV

Selenium

13µg · 24% DV

Sodium

490mg · 21% DV

Iron

2mg · 11% DV

How Nutritious Is Sourdough Bread?

Nutrient density

Medium

45/ 100

How many vitamins, minerals and how much fiber this food carries per calorie. A high score means a lot of nutrition for few calories.

Satiety score

Medium

44/ 100

An EatBetter score computed from fiber, protein and calorie density. A high score means staying full longer on the same calories.

Both scores are calculated per 100 g and do not change with the selected portion. The satiety score is EatBetter's own calculation, not a clinical measure.

Sourdough Bread Glycemic Index

GLYCEMIC INDEX

Medium

0 Low5570100

GLYCEMIC LOAD

High

Accounts for portion size — a more realistic measure than GI alone.

How to Burn Off Sourdough Bread

To burn the 250 calories in 100 g:

🚶

62min

Walking (5 km/h)

🏃

26min

Running (8 km/h)

🚴

34min

Cycling

🏊

29min

Swimming

Times are calculated with the MET equation for a 70 kg adult. Actual burn varies with your weight, age and pace.

Is Sourdough Bread Processed?

NOVA 2

Minimally Processed

1. Unprocessed

2. Minimally Processed

3. Processed

4. Ultra-Processed

NOVA classifies foods into 4 groups by industrial processing. NOVA 1 (unprocessed) is the healthiest.

Does Sourdough Bread Contain Allergens?

Contains these allergens:

Gluten yes

Dairy free

Eggs free

Peanuts free

Tree nuts free

Fish free

Soy free

Sesame free

Which Diets Is Sourdough Bread Good For?

Vegan

— Not suitable

Vegetarian

✓ Suitable

Gluten-Free

— Not suitable

Dairy-Free

— Not suitable

Mediterranean

— Not suitable

Paleo

— Not suitable

Whole30

— Not suitable

DASH

— Not suitable

Keto

— Not suitable

Low FODMAP

— Not suitable

Sourdough Bread Fat Profile

SATURATED

0.2g

MONOUNSATURATED

0.2g

POLYUNSATURATED

0.3g

⚖️

Omega 6:3 ratio 6:1

Above the ideal 4:1 (6:1).

Compare Sourdough Bread

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Sourdough Bread vs Whole wheat pasta126 kcal more per 100 g

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Sourdough Bread vs Breadstick160 kcal fewer per 100 g

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Sourdough Bread vs Simit90 kcal fewer per 100 g

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Foods Similar to Sourdough Bread

🍚

Bulgur Pilaf

120 kcal

🍝

Whole wheat pasta

124 kcal

🥖

Breadstick

410 kcal

🥯

Simit

340 kcal

🥣

Granola

450 kcal

🍚

Rice Pilaf

150 kcal

🍚

Basmati Rice Pilaf

140 kcal

🍝

Pasta (Boiled)

155 kcal

Frequently Asked Questions About Sourdough Bread

What is sourdough bread?

Sourdough bread is bread leavened with a fermented mixture of flour and water called a starter, rather than relying only on packaged baker’s yeast. The starter’s natural yeasts and bacteria create its distinctive flavor and help the dough rise.

Is sourdough bread healthier than regular bread?

Sourdough bread is not automatically healthier than every other bread. Its long fermentation changes flavor and dough characteristics, while the flour and other ingredients still matter. A whole-grain sourdough loaf can provide more fiber than one made with refined flour.

Why does sourdough bread taste sour?

Sourdough bread tastes tangy because bacteria in the starter produce acids during fermentation. A longer fermentation or cooler proofing can make the flavor more pronounced, though the level of sourness varies with the starter and baking method.

Does sourdough bread contain probiotics?

Baked sourdough bread generally does not provide live probiotic cultures, because the high heat of baking kills most of the starter’s microorganisms. Fermentation can still affect the bread’s flavor and structure, but it should not be treated as a probiotic food.

Is sourdough bread easier to digest?

Some people find sourdough bread easier to digest, but it is not easier for everyone. Fermentation alters parts of the dough, yet the result depends on the recipe and the individual; sourdough is not a safe substitute for gluten-free bread for someone who must avoid gluten.

Can people with diabetes eat sourdough bread?

Yes, many people with diabetes can include sourdough bread, but it still contains carbohydrates and can raise blood sugar. Choose a portion that fits your meal plan, and consider how the particular loaf affects your own readings.

How do you make a sourdough starter for sourdough bread?

To make a sourdough starter, mix flour and water and keep feeding the culture with fresh flour and water as it ferments. Once it reliably bubbles and rises after feeding, it can leaven sourdough bread; this usually takes several days or longer.

How should you store sourdough bread?

Keep sourdough bread at room temperature in a bread box or a breathable bag, with the cut side facing down, and use it within a few days. Refrigeration often makes bread stale faster, so it is usually not the best choice.

Can you freeze sourdough bread?

Yes, sourdough bread freezes well. Slice the loaf first and seal the slices in a freezer-safe bag so you can take out only what you need. Thaw slices at room temperature or toast them straight from frozen.

Why didn’t my sourdough bread rise?

Sourdough bread may fail to rise if the starter is weak, the dough is too cold, or fermentation is too short. Use a recently fed, active starter and give the dough enough time to expand before baking; a clock alone is not a reliable guide.

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Nutrition data compiled from USDA FoodData Central and scientific sources.

· Last updated: September 24, 2026