Keto Sourdough Glossary
Sinless Sourdough™
Keto Sourdough Glossary
The Top 10 Questions Answered
Every other page on this site assumes you already know some of the basics. This one doesn’t. If a term like “discard,” “net carbs,” or “third-party tested” has ever made you pause, start here.
Why Sinless Sourdough Created This Approach
Sinless Sourdough™ built this glossary because we noticed something: people were asking us the same foundational questions over and over, often after already reading a more advanced page. Our 5-Minute 1-2-7 Keto Sourdough Blueprint™ and the rest of our content only make sense once these basics click — so this page exists to make sure they do.
Written by Shari MAC, CEO and founder of Sinless Sourdough. 30+ years in the food and wine industry, international award-winning cookbook author, former syndicated food and wine journalist. Shari developed the Flexible Keto approach to sourdough after losing over 70 lbs and shifting her own work from gourmet food and wine to low-carb baking.
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1. What Is Keto Sourdough?
Keto sourdough is bread made through real sourdough fermentation, using lower-carb, higher-fibre flour combinations instead of traditional wheat flour.
The fermentation part is the same wild-yeast, lactic-acid-bacteria process used in traditional sourdough. The difference is entirely in what’s fed to the starter and mixed into the dough.
2. What Is a Keto Sourdough Starter?
A starter is a living culture of wild yeast and lactic-acid bacteria that ferments dough, giving sourdough its rise and its tang. You keep it alive by feeding it regularly.
A keto starter is simply one fed low-carb flour combinations instead of traditional high-carb wheat flour — same living culture, different food source.
3. What’s the Difference Between Net Carbs and Total Carbs?
Total Carbs − Fibre = Net Carbs
Total carbs is every gram of carbohydrate in a food. Net carbs subtracts fibre, and sometimes certain sugar alcohols, to estimate the portion your body actually digests into blood sugar.
Net carbs is a widely used convention in low-carb foods, but it’s not an FDA-regulated term — different brands calculate it slightly differently.
4. Can You Make Sourdough With Vital Wheat Gluten?
Yes. Vital wheat gluten is concentrated wheat protein with very few carbs relative to its volume, and it’s used to give low-carb dough the structure it needs to actually rise and hold together.
It’s still wheat protein, so it still contains gluten — bread made with vital wheat gluten is not gluten-free. The full gluten and Celiac safety details are covered on our Keto Sourdough Recipes page.
5. What Does “Fermentation” Actually Mean in Bread?
Fermentation is what happens when wild yeast and bacteria in a starter break down compounds in the flour over time.
That process produces carbon dioxide, which makes dough rise; organic acids, which create sourdough’s characteristic tang; and other byproducts that build flavour the longer fermentation runs.
6. What’s the Difference Between Keto and Low-Carb?
Strict keto is a specific macronutrient ratio — very low carb, moderate protein, high fat — intended to shift the body into ketosis. Low-carb is a broader term for reducing carbohydrate intake without necessarily hitting strict keto ratios.
Sinless Sourdough uses a Flexible Keto approach: designed to fit within a keto framework, but built to also work for people who are simply low-carb, diabetic-friendly, on WW, or managing insulin resistance.
7. Is Keto Sourdough Gluten-Free?
It depends entirely on the recipe. Keto sourdough can be made with gluten (usually via vital wheat gluten) or without it, using different flour and binder combinations.
It’s never automatically gluten-free just because it’s keto, and even gluten-free recipes aren’t Celiac-safe unless made in a certified gluten-free facility. See our Recipes page for the full explanation.
8. What Does “DNA-Sequenced” or “Third-Party Tested” Actually Mean?
DNA sequencing identifies the actual microbial species living in a starter, confirming it genuinely contains wild yeast and lactic-acid bacteria — not just flour and water with no real fermentation happening.
Third-party tested means an independent lab, not the company selling the product, verified those results. That distinction matters: a company testing its own product isn’t the same as outside verification.
9. What’s the Difference Between a Starter and a Discard?
Your starter is the living culture you maintain long-term by feeding it regularly.
Discard is the portion you remove before each feeding to keep the starter from growing indefinitely. Rather than throwing it away, that discard can go straight into recipes that don’t need a full rise — biscuits, scones, pancakes, and similar bakes.
10. Is Keto Sourdough the Same as Sourdough Discard Baking?
Related, but not the same thing. Keto sourdough describes the low-carb ingredient approach. Discard baking describes using the byproduct of starter maintenance in recipes.
The two overlap whenever you bake with a keto starter’s discard — which is most of what’s in our free recipe library — but they answer different questions, not the same one.
Related Questions You Might Ask Next
• Is keto sourdough strict keto?
• Why does the carb-to-fibre ratio matter more than net carbs alone?
• Can people with diabetes eat sourdough bread?
• Can eating bread actually help you lose weight?
• What are the actual health benefits of keto sourdough?
• Is high-fibre keto sourdough safe on a GLP-1 medication?
Ready to Start?
Every Sinless Sourdough™ starter ships with the complete Starter Guide — your step-by-step foundation for bringing your culture to life and baking your first low-carb sourdough loaf.
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