Is Sourdough Healthier Than Whole Wheat Bread?

Short answer: The white-bread source is a French/Vienna category that includes sourdough, not a laboratory test of fermentation. Whole-wheat bread has more fiber in these records; whole-grain sourdough is a different food.

Selected foods: French/Vienna white bread (includes sourdough) and Wholegrain bread. These specific preparations are compared below.

Which to pick for your goal

If you want	Better pick	The numbers
Fewer calories	Whole Wheat Bread	252 kcal vs 272 kcal per 100 g
More protein	Whole Wheat Bread	12 g vs 11 g per 100 g
Most protein per calorie	About the same	sourdough 4 g, whole wheat bread 4.9 g protein per 100 kcal
More fiber (keeps you full)	Whole Wheat Bread	6 g vs 2.2 g per 100 g
Less sugar	About the same	sourdough 4.6 g, whole wheat bread 4.3 g per 100 g
Less saturated fat	About the same	sourdough 0.5 g, whole wheat bread 0.7 g per 100 g
Less salt	About the same	sourdough 1.5 g, whole wheat bread 1.1 g per 100 g
Overall (Nutri-Score)	Whole Wheat Bread	B vs D

Small differences count as a tie: a few calories or a few tenths of a gram won't change your day.

Nutrition side by side, per 100 g

Per 100 g	Sourdough	Whole Wheat Bread
Calories	272 kcal	252 kcal
Protein	11 g	12 g
Fat	2.4 g	3.5 g
incl. saturated	0.5 g	0.7 g
Total carbohydrates	52 g	43 g
incl. sugars	4.6 g	4.3 g
incl. fiber	2.2 g	6 g
Salt	1.5 g	1.1 g
Nutri-Score	D	B

Rounded values from exact USDA records (see * Data and sources below). Different brands, cuts and recipes can have different values. Diary food cards and the alternative versions below retain their own typical recipes.

For the same amount: 50 g

Equal amount	Sourdough	Whole Wheat Bread
Calories	136 kcal	126 kcal
Protein	5.4 g	6.2 g
incl. saturated	0.3 g	0.4 g
incl. sugars	2.3 g	2.2 g
incl. fiber	1.1 g	3 g

In a typical serving

One serving	Sourdough	Whole Wheat Bread
Serving	slice, 50 g (1.8 oz)	slice, 35 g (1.2 oz)
Calories	136 kcal	88 kcal
Protein	5.4 g	4.3 g
Fiber	1.1 g	2.1 g
Sugars	2.3 g	1.5 g
Saturated fat	0.3 g	0.3 g
Easy walking to burn it*	44 min	29 min

* For a 70 kg (154 lb) person; the app works it out for your weight and your activities.

Portion size usually moves the numbers more than the choice between two similar foods: a heaping serving of the “healthier” one can easily outweigh a modest serving of the other.

Blood sugar angle

Sourdough has 52 g of carbohydrate per 100 g (4.6 g sugars, 2.2 g fiber); Whole wheat bread has 43 g (4.3 g sugars, 6 g fiber). This table is not a measured glycemic-response comparison; the amount eaten and the rest of the meal matter. Glycemic index values vary by variety, ripeness and cooking, so treat any single number with caution — and eat either with vegetables and some protein.

Other versions: typical diary estimates

The first two rows repeat the selected USDA records; other rows are typical diary estimates, without an exact source-record match. The cut, fat level or recipe can change the result. Per 100 g:

Per 100 g	Calories	Protein	Sat. fat	Sugars	Fiber	Nutri-Score
Sourdough	272	11 g	0.5 g	4.6 g	2.2 g	D
Whole Wheat Bread	252	12 g	0.7 g	4.3 g	6 g	B
White bread	265	8 g	0.7 g	4.5 g	2.4 g	C
Rye bread	210	6.6 g	0.2 g	1.5 g	5.8 g	B

*Data and sources

Bread, french or vienna (includes sourdough) — USDA FDC 172675 (SR Legacy; published 4/1/2019).
Bread, whole-wheat, commercially prepared — USDA FDC 172688 (SR Legacy; published 4/1/2019).

Retrieved 2 October 2026. USDA composition is per 100 g; drink values per 100 ml use the record’s measured household weight, with the USDA customary cup of 236.6 ml. Displayed cup servings remain 240 ml. Carbohydrate includes fiber on this US site; salt is sodium × 2.5. The food records are historical reference values, not current brand guarantees.

WHO guideline on free sugars: honey, syrups and fruit-juice sugars count as free sugars. WHO guideline on saturated and trans fats: consider replacing saturated fat with unsaturated fat.

FAQ

Which has fewer calories, sourdough or whole wheat bread?

Whole wheat bread: 252 kcal vs 272 kcal per 100 g. In a typical serving that's 136 kcal for sourdough (slice, 50 g) and 88 kcal for whole wheat bread (slice, 35 g).

Is sourdough or whole wheat bread better for weight loss?

No single food makes you gain or lose weight — the day's total does. Gram for gram, whole wheat bread is the lighter pick (252 kcal vs 272 kcal per 100 g) and has more protein and more fiber, which help you stay full. The portion usually matters more: a typical serving of sourdough (slice, 50 g) is 136 kcal, of whole wheat bread (slice, 35 g) 88 kcal.

Which has more protein, sourdough or whole wheat bread?

Whole wheat bread: 12 g vs 11 g per 100 g. Per typical serving: 5.4 g for sourdough (slice, 50 g) and 4.3 g for whole wheat bread (slice, 35 g).

Which has more fiber, sourdough or whole wheat bread?

Whole wheat bread: 6 g vs 2.2 g per 100 g. In a typical serving that's 1.1 g for sourdough and 2.1 g for whole wheat bread — and most adults eat less fiber than dietary guidelines recommend.

Which has less sugar, sourdough or whole wheat bread?

About the same: sourdough 4.6 g, whole wheat bread 4.3 g per 100 g. A typical serving has 2.3 g of sugars for sourdough and 1.5 g for whole wheat bread.

Log it and see your day

In Calories Not Count every food gets a Nutri-Score grade, a sugar–salt–fat–fiber traffic light, fair same-calorie swaps and the minutes of movement it costs for your weight and your activities — no scale needed. Goals like lower sugar, more protein or more omega-3 can be set in the diary, and swaps there are ranked for that goal.