How to Make Low-Carb Sourdough Discard Pizza Crust

Sourdough discard transforms into a delicious low-carb pizza crust that’s highly digestible and super low in carbs—as long as you keep the toppings low-carb too!

If you’ve visited this page before, you’ll notice I’ve updated the crust recipe — again! That’s because I’ve been on a mission to perfect it: crispier, easier to make, and even lower in net carbs.

According to pizza expert Dave Portnoy, the crust needs a firm undercarriage — and I couldn’t agree more. So I kept testing and refining until I finally landed on this simple, firm, and delicious crust that meets the mark.

But here’s the best part…

✨ It’s made with Sinless Sourdough discard.

Using the discard from your low-carb sourdough starter doesn’t just reduce waste — it actually makes the crust more digestible. I personally ate nearly half the pizza and didn’t feel heavy or bloated. Here’s why:

Table of Contents

The Science Behind 24-Hour Prefermentation

🍞 What Preferementing Does

Extends fermentation time for fresh almond flour, allowing the wild sourdough bacteria (Lactobacillus species) and yeasts (Saccharomyces cerevisiae and Candida milleri) to:

Break down phytic acid and other antinutrients in the almond flour through enzymatic hydrolysis, improving bioavailability of minerals like zinc, iron, and magnesium by up to 60%.
Partially digest proteins and fibres via proteolytic and cellulolytic enzymes, reducing particle size and making nutrients more accessible to digestive enzymes.
Develop more flavour through lactic acid fermentation, which produces organic acids (lactic and acetic acid) that create the characteristic tangy complexity of sourdough while lowering pH to 3.5-4.5.

This process transforms fresh almond flour from “raw” to “fermented,” creating similar digestive benefits to the pre-fermented flours already present in your sourdough discard through controlled microbial activity.

🔥 Benefits for Your Pizza Crust

Lower glycemic impact due to resistant starch formation and partial carbohydrate breakdown by amylase enzymes
Enhanced digestibility with reduced potential for digestive discomfort through pre-digestion of complex proteins and elimination of enzyme inhibitors
Improved crust structure from protein modification and gluten-like network formation between cheese proteins and fermented almond compounds
Deeper flavour development from Maillard reaction precursors created during fermentation, enhancing browning and taste complexity during baking

⏰ The 24-Hour Process

The extended 24-hour fermentation (versus the typical 8-12 hours) allows for:

Complete phytic acid reduction – Studies show 24-hour fermentation can reduce phytic acid by 62-96% compared to shorter periods
Maximum enzyme activity – Longer fermentation ensures full activation of naturally occurring enzymes in both starter and almond flour
Optimal flavour compound development – Extended time allows for complex ester and organic acid formation that contributes to superior taste
Structural protein changes – Sufficient time for protein denaturation and cross-linking that improves dough handling and final texture

This scientific approach transforms simple ingredients into a more nutritious, digestible, and flavourful pizza crust through controlled fermentation chemistry.

What Are the Health Benefits of Low-Carb Sourdough Discard?

Low-carb sourdough discard is the leftover mixture from maintaining a sourdough starter. Instead of throwing it out, you can repurpose it into healthy, low-carb recipes that offer surprising nutritional benefits.

Supports Gut Health

The fermentation process creates beneficial probiotics that promote a healthy gut microbiome, improve digestion, and enhance nutrient absorption. These probiotics can also reduce bloating, gas, and other digestive issues, including symptoms of irritable bowel syndrome (IBS).

Perfect for Low-Carb Diets

Sourdough discard works excellently in low-carb and keto lifestyles. When combined with ingredients like almond flour or protein powder, you can create delicious low-carb pizzas, crackers, and pancakes. A slice of sourdough discard pizza can provide around 18.6 grams of protein.

Better Blood Sugar Control

With its naturally low glycemic index, sourdough discard doesn’t cause rapid blood sugar spikes. Regular consumption can improve insulin sensitivity and help manage blood sugar levels, making it beneficial for preventing type 2 diabetes.

Nutrient-Rich and Bioavailable

Fermentation breaks down compounds like phytic acid that block mineral absorption, making nutrients more available to your body. Whole grain sourdough discard is also an excellent source of dietary fibre, essential for digestive health and appetite control.

Reduces Food Waste

Using sourdough discard promotes sustainable cooking by repurposing what would otherwise be thrown away. This creative approach reduces environmental impact while adding nutritional value to your meals.

Unique Flavour and Versatility

The distinctive tangy flavour from natural fermentation adds complexity to both savoury and sweet dishes. It pairs well with rich toppings like cheese, meats, and vegetables.

Easier to Digest

While not gluten-free, the fermentation process breaks down some gluten and phytic acid, making sourdough discard easier to digest than regular bread. This is particularly helpful for those with mild gluten sensitivities.

Adaptable to Dietary Needs

Sourdough discard fits into various diets—low-carb, keto, or high-protein. Making your own recipes gives you complete control over ingredients, avoiding unnecessary additives and preservatives found in commercial products.

What Are Some Tips For Working With Low Carb Sourdough Discard?

Here are a few tips to keep in mind:

At Sinless Sourdough, however, we don’t discard the starter in the traditional sense. In our method, the “discard” is actually the living starter. We never throw away the starter because it’s used in all of our bread and baked good recipes, which require half to one cup of living starter depending on the recipe. So, technically speaking, there’s no discard. However, in the context of our low carb sourdough discard baking, the “discard” is simply the starter.

For the low carb sourdough discard pizza recipe, you’ll remove about half a cup of starter from your 16-ounce (500 mL) jar. Afterward, feed your starter with the low carb ingredients and spring water to build it back up for future use.

Tips for the Best Results:

Feed Your Starter the Night Before: For optimal health, feed your Sinless Sourdough starter the night before you plan to bake. This gives it enough time to ferment and become bubbly, which is key to a healthy dough. You’ll want your starter to be actively rising and almost bursting out of the jar before you use it.
Mix Before Measuring: Once your starter is bubbly and ready, use a chopstick or starter spatula to gently mix it to evenly distribute the air pockets, and then measure out the required 1/2 cup for your recipe.
Blending the Starter: If you’re using the low carb sourdough discard (or starter) in any recipe other than traditional bread, such as pizza or pancakes, it’s a good idea to blend the discard in a small mixer. This helps achieve a smooth, pancake-like consistency, which works better in these types of recipes.
Consider the Moisture: Since sourdough starter is wet, take that moisture into account when creating any low-carb sourdough discard recipe. If you’re using the starter in a recipe like pizza dough, make sure to adjust the flour or other dry ingredients as necessary to balance the hydration levels.

Low-Carb Sourdough Pizza Crust with 24-Hour Preferment

Makes 1 (14-inch) pizza, 8 slices

Equipment Needed:

Non-stick pan OR pizza pan or pizza stone with parchment paper

Ingredients:

Preferment (night before):

½ cup Sinless Sourdough living starter*
1 cup almond flour
2 tbsp coconut flour
¼ cup water (adjust for batter-like consistency)

Crust (day of baking):

Preferment from above
1½ cups shredded hard cheese (Parmigiano or Asiago)
1 teaspoon xanthan gum

Toppings:

1½ cups low-carb pizza sauce (or as desired)
Low carb toppings of your choice
1 cup partly skimmed mozzarella cheese

About the Starter:

Bring your Sinless Sourdough low-carb dehydrated starter to life following the starter guide included with your purchase.

Preparation Instructions:

Step 1: Prepare the Preferment (Night Before)

In a bowl, mix ½ cup Sinless Sourdough living starter, 1 cup almond flour, and about 2 tbsp spring water.
Stir to a smooth, batter-like consistency.
Cover loosely and let ferment at room temperature for 24 hours. This develops flavour, improves digestibility, and softens the almond flour.

Step 2: Prepare the Crust (Day of Baking)

Preheat your oven to 400°F (200°C).
In a mixing bowl, combine the 24-hour preferment, 1½ cups shredded hard cheese, and 1 teaspoon xanthan gum. Mix well until fully incorporated into a dough ball.
Prepare your pan by lining a 14-inch pizza pan with parchment paper or use a non-stick oven-proof sauté pan.
Place the dough ball in the centre of the pan.
Using slightly wet fingers and palms, gently press the dough outward until it reaches the edges forming a thin, even crust with no holes or gaps.

Step 3: Bake the Crust

Place the pan on the bottom oven rack and bake for 20-25 minutes, until the crust is golden brown.
Remove carefully, flip the crust so the golden side is up, and bake again until the second side is golden brown and crisp.
Remove from oven and let cool completely on a wire rack — this resting period firms up the crust for that perfect crunch.

Step 4: Add Toppings and Final Bake

Spread low-carb pizza sauce evenly over the crust.
Add your favorite toppings.
Sprinkle 1 cup partly skimmed mozzarella cheese on top for extra crunch and flavor.
Return pizza to oven and bake for an additional 10 minutes until heated through and cheese is melted and bubbling.

What Is The Nutritional Value of Sinless Sourdough Discard Pizza?

Nutritional Information (Based On Sinless Sourdough living starter brought to life with almond flour and coconut flour):

For 1/8th of a 14-inch pizza (using Rao’s pizza sauce, not including toppings):

Calories: 199
Protein: 10.9
Total Fat: 14.25
Total Carbs: 7.2
Fiber: 4.6
Net Carbs: 2.6

20 Low-Carb Sinless Sourdough Signature Discard Pizza Ideas

1. Sinless Sourdough Discard Pizza with Pepperoni and Mozzarella

Toppings: Pepperoni, extra mozzarella cheese, fresh basil, drizzle of olive oil.
Flavour Profile: Classic, savoury, with a fresh herb kick.

2. Sinless Sourdough Discard Pizza with Grilled Chicken and Spinach

Toppings: Grilled chicken, spinach, mozzarella, garlic, Parmesan.
Flavour Profile: Light, protein-packed, with a garlic infusion.

3. Sinless Sourdough Discard Pizza with Italian Sausage and Mushrooms

Toppings: Italian sausage, mushrooms, mozzarella, fresh oregano.
Flavour Profile: Rich, hearty, with a balance of meaty and earthy.

4. Sinless Sourdough Discard Pizza with Anchovies and Arugula

Toppings: Anchovies, mozzarella, arugula, garlic, olive oil.
Flavour Profile: Bold, savoury, with a peppery bite from the arugula.

5. Sinless Sourdough Discard Pizza with Bacon, Zucchini, and Goat Cheese

Toppings: Bacon, zucchini, goat cheese, fresh thyme, mozzarella.
Flavour Profile: Smoky, savoury, with creamy goat cheese and fresh herbs.

6. Sinless Sourdough Discard Pizza with Salami, Olives, and Bell Peppers

Toppings: Salami, olives, bell peppers, mozzarella, fresh rosemary.
Flavour Profile: Bold and briny with a sweet finish from peppers.

7. Sinless Sourdough Discard Pizza with Ground Beef, Onions, and Cheddar

Toppings: Ground beef, onions, cheddar, cilantro, cumin.
Flavour Profile: Taco-inspired with rich beefy goodness and spice.

8. Sinless Sourdough Discard Pizza with Turkey Bacon, Mushrooms, and Microgreens

Toppings: Turkey bacon, mushrooms, mozzarella, micro-greens, olive oil.
Flavour Profile: Smoky turkey bacon, earthy mushrooms, fresh micro-greens.

9. Sinless Sourdough Discard Pizza with Shrimp, Anchovies, and Ricotta

Toppings: Shrimp, anchovies, ricotta, spinach, garlic.
Flavour Profile: Seafood dream with creamy ricotta and garlic spinach.

10. Sinless Sourdough Discard Pizza with Ham, Broccoli, and Provolone

Toppings: Ham, broccoli, provolone, mozzarella, parsley.
Flavour Profile: Savoury ham paired with crispy broccoli and cheese.

Introducing Sinless Sourdough “Starter + Membership” and “Global Heritage Collection”

Stop sacrificing flavour for your health goals – our authentic heritage sourdough starters have been specially adapted for low-carb baking

Sinless Sourdough™ Heritage Collection

Transform your low-carb baking with our Global Heritage Collection featuring unique starters from historic moments across continents. Each brings its own personality and flavor profile while maintaining excellent nutritional values—just 1g net carbs compared to 8-10g in traditional starters.

Choose from:

1849 San Francisco Gold Rush – Authentic California sourdough character
1898 Yukon Gold Rush – Subtle tanginess with notes of butter
1847 Oregon Trail – Rustic character with exceptional rise
1000-Year-Old Italian Monastery – Delicate complexity with ancient lineage

Each starter connects you to centuries of baking tradition while supporting your modern low-carb lifestyle. Our proprietary transformation process preserves their unique characteristics while adapting them for health-conscious baking.

When you purchase any Sinless Sourdough™ starter, you receive our comprehensive onboarding sequence teaching you exactly how to revive your dehydrated starter for perfect low-carb, high-protein results every time.

Click the link:

SINLESS STARTER SHOP

🍞 START YOUR LOW-CARB SOURDOUGH JOURNEY TODAY! 🍞

Sinless Sourdough™ Starter + Membership Includes:

Limited Time Offer: 82% OFF – Only $19.99 Today (Regular Price: $113)

Authentic Heritage Starter shipped directly to your door
Complete Video Training Library showing you step-by-step how to create:
- Artisan boules and batards with delicious crispy crust and soft interior
- Crisp French baguettes for the dinner table or as crostini
- Chewy Montreal-style bagels that won’t spike your blood sugar
- German street pretzels with authentic alkaline crust
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Supportive Community of fellow low-carb bakers to share your journey
Extensive Recipe Collection for using sourdough discard (nothing goes to waste!)

“After years of disappointing low-carb bread experiments, Sinless Sourdough changed everything. I’m enjoying real sourdough again without the carb guilt!” — Maria T.

“My family can’t tell the difference between these loaves and traditional bread. The starter is incredibly active and the results are amazing!” — James K.

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Use code: Sinless82 at checkout Offer expires soon! Limited starter batches available

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FYI: SOURDOUGH MEDICAL STUDIES AND REVIEWS:

Here they are:

Does Sourdough Bread Provide Clinically Relevant Health Benefits?: Link: https://pmc.ncbi.nlm.nih.gov/articles/PMC10399781/
The Sourdough Microbiome : Link: https://asm.org/articles/2020/june/the-sourdough-microbiome
Sourdough Microbiome Comparison and Benefits: Link: https://pmc.ncbi.nlm.nih.gov/articles/PMC8306212/
Nutritional Benefits of Sourdough; Systematic Review : Link: https://pubmed.ncbi.nlm.nih.gov/36811591/
Use of sourdough in low FODMAP baking : Link: https://pubmed.ncbi.nlm.nih.gov/29932101/

Disclaimer:

All information provided on this website regarding the health benefits of sourdough low carb bread is intended for educational purposes only. The content presented is not meant to be taken as specific medical advice for any individual. It should not be considered a replacement for professional medical guidance or treatment. If you have any health concerns, especially related to diabetes, pre-diabetes, or any other medical condition, please consult with a healthcare professional immediately.