Is sourdough bread keto-friendly?

Standard sourdough is not recommended on a strict keto diet. It contains 16–19g of carbs per slice depending on the flour used, which can exceed a full day's carb limit for people targeting 20g per day. A homemade keto version using almond flour and coconut flour brings the carb count down significantly.

Does sourdough have fewer carbs than regular bread?

Yes, but only marginally. The fermentation process breaks down some of the starches and sugars, which reduces the carb content slightly. It's not enough of a difference to make traditional sourdough low-carb.

Can you use almond flour in a sourdough starter?

Almond flour can be used in a starter and works well for low-carb and gluten-free versions. Coconut flour is used in the starter recipe above, but almond flour is a reasonable substitute if that's what you have on hand.

Is sourdough bread healthy?

Compared to most commercial white bread, sourdough has some advantages. It has a lower glycemic index, supports gut health through fermentation, and is easier to digest for some people. That said, it's still a carbohydrate-rich food and doesn't fit a strict keto diet without modifications.

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

Ingredients

Scale

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

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Instructions

Preheat oven to 350°F. Line a baking sheet with parchment paper.
Whisk all dry ingredients together in a large bowl.
In a separate bowl, whisk eggs, egg whites, buttermilk, apple cider vinegar, and warm water until slightly frothy.
Pour wet into dry gradually, stirring until a smooth, lump-free dough forms.
Divide into 4–6 equal portions and shape into small rounds or ovals. Score the tops with 2–3 diagonal cuts.
Bake for 30 minutes until edges are golden and loaves sound hollow when tapped.
Brush tops with melted butter, sprinkle with flaky salt, and broil on high for 3 minutes until deep golden brown.
Cool on a wire rack for at least 15 minutes before slicing.

Notes

Use psyllium husk powder, not whole husks — whole husks don’t hydrate properly and leave a grainy texture
Don’t skip the cooling time; cutting too early makes the inside gummy
The dough will be softer and stickier than conventional bread dough — this is normal
Scoring the tops isn’t just aesthetic; it helps the loaves expand evenly in the oven
Watch the broil step closely — it goes from golden to burnt fast
For protein powder: add 1–2 scoops of unflavored whey isolate to the dry ingredients and reduce almond flour by 2 tbsp per scoop to keep the dough balanced
Sunflower seeds turn the bread green when they react with baking soda — harmless, but worth knowing before you add them
Filtered water is better than tap for the starter; chlorine can slow fermentation

Storage

Room temp (up to 2 days): wrap in paper bag or plastic wrap
Fridge (up to 5 days): wrap tightly
Freezer (up to 3 months): slice first, freeze flat, then bag

Author: Natasha Krajnc
Prep Time: 15 mins
Cook Time: 33 mins
Category: bread