Is Keto Sourdough Bread Low Carb? (Plus How to Make a Low-Carb Loaf)

Last updated on May 26th, 2026

Many who follow a low carb or ketogenic diet can only consume a small set amount of carbs a day. So small pleasures like consuming a couple slices of sourdough for breakfast may easily kick you out of ketosis. If you’ve been missing bread on keto, this is the recipe to try.

Table of Contents

• Can You Eat Sourdough Bread on Keto?
• What Makes a Keto Sourdough Starter Different
• How to Make a Keto Sourdough Starter
  • Ingredients
  • How to
  • Tips for a healthy Keto starter
• Keto Sourdough Bread Recipe
  • Ingredients
  • Instructions
• Keto Sourdough Bread Recipe
  • Ingredients
  • How to Make
• Recipe Notes
  • About Protein Powder
  • About Psyllium Husk
• Optional Add-Ins: Nuts and Seeds
• How to Store Keto Sourdough Bread
• FAQs

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Can You Eat Sourdough Bread on Keto?

Righ out, standard sourdough bread isn’t keto-friendly.

A single slice made with whole wheat flour contains around 19g of carbs, nearly a full day’s allowance if you’re keeping to a strict 20g daily limit.

That said, sourdough does have slightly fewer carbs than regular bread.

During fermentation, the wild yeast and bacteria partially break down the starches and sugars in the dough. This lowers the final carb count a little, but not enough to make it safe for most people in ketosis.

Let’s compare regular bread and sourdough:

Bread Type	Total Carbs per Slice
White bread	20.5g
Sourdough white bread	18.5g
Whole wheat bread	18.8g
Sourdough whole wheat bread	16.8g
German rye bread	18g
Sourdough German rye bread	16g

As you can see, the difference isn’t dramatic.

For anyone sticking to 20–50g of carbs per day, even one slice of traditional sourdough takes up a significant chunk.

The solution: use low-carb flours to make a keto-friendly version that mimics sourdough’s tangy flavor and open crumb without spiking your carb intake.

What Makes a Keto Sourdough Starter Different

A traditional sourdough starter uses regular flour and water, which means it’s loaded with carbs before it even goes into a recipe.

A keto starter swaps high-carb flour for coconut flour, which is naturally low in carbohydrates and gluten-free.

The starter is what gives sourdough its signature tang. Even in a keto version, a live starter produces the lactic acid that creates that familiar sour flavor. Using this means you’re not sacrificing much in terms of taste.

How to Make a Keto Sourdough Starter

Makes: Enough starter for ongoing use

Time: 5 minutes active + 24–48 hours to develop

Ingredients

• 4 oz coconut flour
• ½ cup filtered water

How to

1. Combine the coconut flour and filtered water in a tall glass jar or mixing bowl. Whisk until smooth. The texture should resemble a thin pancake batter.
2. Cover the jar loosely with a tea towel or cloth, leaving a small gap for airflow.
3. Place the jar somewhere warm around 70°F (21°C) and leave it undisturbed.
4. Feed the starter every 8–12 hours by discarding half and adding fresh coconut flour and water in equal parts. Within 24–48 hours, you should start to see bubbles forming, which means fermentation is active.

Tips for a healthy Keto starter

• Filtered water works better than tap water, as chlorine can slow fermentation.
• Consistent temperature matters. Too cold and the starter will be sluggish.
• A rise-and-fall pattern (the starter puffs up then deflates between feedings) means it’s active and ready to use.

Keto Sourdough Bread Recipe

If you’re someone who loves bread as much as I do, but don’t want the additional carbs to throw you out of ketosis, then try this keto-friendly, sourdough bread recipe!

Ingredients

• 1 ½ cup almond flour
• ⅓ cup psyllium husk
• ½ cup coconut flour
• ½ cup flaxseed meal
• ½ tsp baking powder
• 1 tsp baking soda
• 1 tsp sea salt/kosher salt
• ¾ cup egg whites
• 2 whole eggs
• ¾ cup buttermilk
• ½ cup apple cider vinegar
• ½ cup warm water
• 3 tbsp melted butter
• 1 tsp Italian seasoning

Instructions

1. Preheat the oven to 350 degrees F, meanwhile line a baking sheet with parchment paper.
2. Add almond flour, psyllium powder, coconut flour, flax meal, salt, baking soda and powder, then whisk to combine.
3. In a separate bowl, add egg whites buttermilk, apple cider vinegar, and water.
4. Whisk until the surface starts to froth.
5. Slowly drop your wet ingredients into your dry ingredients. Mix until you have a lump free dough.
6. Divide and portion the dough into small loaves of equal size.
7. Score the tops of each loaf with a sharp knife. Bake in the preheated oven for 30 minutes until the edges are golden brown.
8. Remove the loaves from the oven, and brush the tops with melted butter, followed by a sprinkle of salt.
9. Place them back into the oven, set to broil for 3 minutes, till the tops are a deep brown color.

Keto Sourdough Bread Recipe

This recipe produces small individual loaves with a firm crust, open crumb, and light tang. It uses a combination of almond flour, coconut flour, and psyllium husk to replicate the structure that gluten provides in traditional bread.

Yield: 4–6 small loaves

Prep time: 15 minutes

Bake time: 33 minutes

Total time: ~50 minutes

Ingredients

Dry ingredients:

• 1½ cups almond flour
• ½ cup coconut flour
• ⅓ cup psyllium husk powder
• ½ cup flaxseed meal
• 1 tsp baking soda
• ½ tsp baking powder
• 1 tsp sea salt or kosher salt
• 1 tsp Italian seasoning (optional)

Wet ingredients:

• 2 whole eggs
• ¾ cup egg whites
• ¾ cup buttermilk
• ½ cup apple cider vinegar
• ½ cup warm water

Finishing:

• 3 tbsp melted butter
• Pinch of flaky salt

Optional add-ins:

• 1–2 scoops unflavored or lightly flavored protein powder (add to dry ingredients; see note below)

How to Make

1. Preheat the oven Set the oven to 350°F (175°C). Line a baking sheet with parchment paper.

2. Mix the dry ingredients In a large bowl, whisk together the almond flour, coconut flour, psyllium husk powder, flaxseed meal, baking soda, baking powder, salt, and Italian seasoning (if using). If adding protein powder, whisk it in at this stage.

3. Mix the wet ingredients In a separate bowl, combine the eggs, egg whites, buttermilk, apple cider vinegar, and warm water. Whisk until the mixture begins to froth slightly on the surface.

4. Combine Pour the wet ingredients into the dry ingredients gradually, stirring as you go. Mix until a smooth, lump-free dough forms. The dough will be thicker than a batter but softer than typical bread dough and his is expected with psyllium husk.

5. Shape the loaves Divide the dough into 4–6 equal portions. Shape each into a small round or oval loaf and place on the lined baking sheet. Score the tops with a sharp knife (2–3 diagonal cuts) to allow for oven spring.

6. Bake Bake at 350°F for 30 minutes, until the edges are golden and the loaves sound hollow when tapped on the bottom.

7. Butter and broil Remove the loaves from the oven. Brush the tops with melted butter and add a small pinch of flaky salt. Return to the oven and broil on high for 3 minutes, watching closely, until the tops turn deep golden brown.

8. Cool Let the loaves cool on a wire rack for at least 15 minutes before cutting. Cutting too early causes the interior to become gummy.

Recipe Notes

About Protein Powder

Adding 1–2 scoops of unflavored protein powder boosts the protein content per loaf without significantly affecting the texture. Whey protein isolate works best since it blends into the dry ingredients smoothly.

Avoid flavored varieties unless you want a sweeter result. Add it with the other dry ingredients in Step 2 and reduce the almond flour by a small amount (about 2 tablespoons per scoop) to keep the dough consistency balanced.

About Psyllium Husk

Psyllium husk powder is a fiber-rich ingredient that acts as a binder in gluten-free and keto baking. It holds the loaf together the way gluten would in a conventional dough, and it creates a springier, more bread-like texture.

It’s also prebiotic, supporting gut bacteria. This is an added benefit since sourdough fermentation already has digestive advantages.

Use psyllium husk powder, not whole psyllium husks. The powder integrates better and produces a smoother crumb.

Optional Add-Ins: Nuts and Seeds

Adding raw nuts or seeds to the dough gives the bread more texture and flavor. Mix them in just before shaping the loaves.

Add-In	Flavor Profile	Notes
Raw pecans	Mild, buttery	Easy to blend in; won’t overpower
Brazil nuts	Bold, crunchy	Chop roughly for texture
Sunflower seeds	Neutral, slightly earthy	May turn bread green due to a reaction with baking soda. Safe to eat, just unexpected

You can add homemade yogurt or homemade butter to this recipe. I have a recipe using pumpkin seed pesto on my pesto sourdough, if you wanted to check it out!

How to Store Keto Sourdough Bread

Timeframe	Storage Method
Up to 2 days	Wrap in paper bag or plastic wrap; leave at room temperature
3–5 days	Wrap tightly and refrigerate
Up to 3 months	Slice, freeze flat on a plate, then transfer to an airtight bag or container

To reheat from frozen, toast individual slices directly from frozen or warm in a 300°F oven for 8–10 minutes.

FAQs