Home / friendly / processed / snacks / breads / Is Sourdough Bread Keto-Friendly?

Is Sourdough Bread Keto-Friendly?

Sourdough Bread on a kitchen counter

The world of ketogenic dieting introduces a variety of challenges, particularly when navigating your way through different food options.

A common query that we come across is 'Is Sourdough Bread Keto-Friendly?' The short answer is no, it isn't.

Throughout this article, we delve into the nutritional specifics of Sourdough Bread, its impact on the ketogenic diet, and the reasons behind why it doesn't qualify as a keto-friendly food.

We also provide potential keto-compatible alternatives and suggestions for maintaining a successful low-carb diet without compromising on your love for bread-like textures and flavors.

Let's dive into the details.


  • Sourdough Bread is not keto-friendly due to its high net carb content.
  • Despite its health benefits, such as aiding digestion and being lower on the glycemic index, Sourdough Bread can disrupt a state of ketosis.
  • Maintaining ketosis while consuming Sourdough Bread is a challenge - find out why as you read further.

Is Sourdough Bread Keto-Friendly?

Diving straight into the heart of the matter, the answer is no - Sourdough Bread, as delightful and rustic as it may be, is not a keto-friendly food. Now, let's peel back the nutritional layers to fully understand why.

Our beloved Sourdough Bread is made from a process of long fermentation using naturally occurring lactobacilli and yeast, giving it that unique tangy taste we all enjoy. But, when it comes to being suitable for a keto diet, it falls short due to its macronutrient composition.

The ketogenic diet, as many of you know, is a low-carb, high-fat diet that aims to get your body into a state of ketosis, where it burns fat for energy instead of carbohydrates. The goal for most people on a keto diet is to limit their carb intake to a meager 20-50 grams per day.

Now, here’s where Sourdough Bread steps out of the keto-friendly arena. Looking at its nutritional profile, Sourdough Bread contains roughly 49.68g net carbs per 100 grams. You've got it right – a single 100-gram serving of Sourdough Bread can potentially knock your diet off the keto track!

Can Sourdough Bread be Incorporated into a Strict Keto Diet?

Given the high net carb content of Sourdough Bread, incorporating it into a strict keto diet would be quite challenging, if not virtually impossible. A strict ketogenic diet is characterized by a severely restricted carb intake, typically no more than 20-50 grams per day. As we've uncovered earlier, a mere 100 grams of Sourdough Bread contain nearly 50 grams of net carbs. That's potentially your entire carb quota for the day!

The cornerstone of a successful keto diet is meticulous tracking of your macronutrient intake, with a special focus on carbs. There are several handy tools and apps available today that can help you track your daily intake of carbs, fat, and protein, making it easier to stick to your keto regimen.

When you use these tools, you can easily see how quickly your carb count will rise with even a modest serving of Sourdough Bread in your meal plan. It would be far too easy to be pushed out of ketosis, the metabolic state where your body burns fat for energy instead of carbs, by including Sourdough Bread in your diet.

Delving into the Carbohydrate Content of Sourdough Bread

Let's take a closer look at the carb content of our Sourdough Bread. As we've mentioned before, 100 grams of this bread contain roughly 49.68 grams of net carbs. But what exactly does "net carbs" mean and why is it so important for the keto diet?

Net carbs are the total carbohydrates in a food minus the fiber. This calculation is critical because dietary fiber is a type of carb that your body can't digest. As a result, it does not raise your blood sugar levels or prevent ketosis, making it a non-issue for those on a keto diet.

In the context of a ketogenic diet, net carbs are what you need to keep an eye on. These are the carbs that can be absorbed by the body and hence can affect your state of ketosis.

Now, let's bring this concept back to Sourdough Bread. If you were to enjoy a typical slice of Sourdough Bread, which weighs around 50 grams, you'd be consuming close to 25 grams of net carbs. That's half the daily allowance for most individuals on a strict ketogenic diet and that's just from one slice of bread!

It's also important to note that carb counts can slightly vary depending on the specific recipe or brand of Sourdough Bread. However, regardless of these slight variations, the net carb count of Sourdough Bread remains too high to be comfortably fitting into a strict ketogenic dietary plan.

Nutritional Snapshot of Sourdough Bread

Sourdough bread offers a rich nutritional profile with an array of macronutrients and micronutrients. Each 100g serving is packed with 51.88g of carbohydrates, which includes 49.68g of net carbs and 2.2g of dietary fiber, aiding digestion. The total fats are a minimal 2.42g, with a balanced mixture of saturated, monounsaturated, and polyunsaturated fats. The protein content stands at 10.75g, contributing to muscle growth and repair.

This bread is also a good source of essential minerals. Sodium and potassium, at 602.0mg and 117.0mg respectively, play vital roles in maintaining fluid balance. The bread provides 32.0mg of magnesium, beneficial for heart health, and 52.0mg of calcium, known for promoting bone health. Trace minerals like iron (3.91mg), copper (0.15mg), and manganese (0.58mg) contribute to various bodily processes, including energy production and antioxidant defense.

The vitamin content is equally impressive. Thiamin, Riboflavin, and Niacin, contributing with 0.71mg, 0.43mg, and 4.82mg respectively, are essential for energy metabolism. Vitamin B6 (0.11mg) plays a role in brain development and function. Vitamins E and K1, along with the carotenoids lutein and zeaxanthin, have antioxidant properties.

Nutrient NameAmount and Unit per 100g
Net Carbs 49.68g
Carbohydrate, by difference 51.88g
Fiber, total dietary 2.2g
Total fats 2.42g
Protein 10.75g
Sodium, Na 602.0mg
Potassium, K 117.0mg
Magnesium, Mg 32.0mg
Calcium, Ca 52.0mg
Vitamin B-6 0.11mg
Vitamin E (alpha-tocopherol) 0.21mg
Vitamin K1 0.7ug
Copper, Cu 0.15mg
Iron, Fe 3.91mg
Phosphorus, P 105.0mg
Selenium, Se 28.6ug
Zinc, Zn 1.04mg
Lutein + zeaxanthin 45.0ug
Manganese, Mn 0.58mg
Thiamin 0.71mg
Riboflavin 0.43mg
Niacin 4.82mg
Pantothenic acid 0.46mg
Folate, total 123.0ug
Choline, total 8.0mg
Folic acid 67.0ug
Calories 272.0kcal
Water 33.0g
Fatty acids, total saturated 0.53g
Fatty acids, total monounsaturated 0.36g
Fatty acids, total polyunsaturated 0.86g
This data was provided by the US Department of Agriculture's FoodData Central system.
'Sourdough Bread' was not found in FoodData Central, so nutritional data for 'Bread, french or vienna (includes sourdough)' was used instead under Cast Iron Keto's editorial and research standards.

Health Implications of Sourdough Bread on a Keto Diet

While Sourdough Bread is not keto-friendly, it's worth noting that it does have several health benefits. However, these benefits must be weighed against the challenges it poses for those trying to maintain ketosis.

Including Sourdough Bread in a keto diet can make it considerably difficult to stay in ketosis. As we've previously established, a single serving of Sourdough Bread can potentially consume your entire daily carb allowance on a keto diet. This can easily knock you out of the metabolic state of ketosis, where your body is primed to burn fat for energy.

Despite its high carb content, Sourdough Bread does have some noteworthy nutritional properties. It's a fermented food, which means it contains probiotics, or beneficial bacteria, that aid digestion and gut health. The fermentation process also helps reduce the phytic acid content in the bread, which can improve mineral absorption.

Additionally, Sourdough Bread has a lower glycemic index compared to other types of bread, meaning it doesn't spike blood sugar levels as much. This could potentially be beneficial for overall health and wellness, particularly for those with blood sugar management issues.

Avoiding Sourdough Bread in Your Keto Meal Plan

Navigating through a keto meal plan can be tricky, especially when you're trying to substitute your favorite foods – in this case, Sourdough Bread. Here are some practical tips to help you steer clear of Sourdough Bread while sticking to your keto diet:

Firstly, awareness is key. Sourdough Bread can often be a hidden component in many dishes – from a simple sandwich to a topping for a hearty bowl of soup. So, it's crucial to be mindful of what's on your plate. Always check the ingredients when dining out or purchasing pre-packaged foods.

Secondly, plan your meals ahead. Meal planning is a powerful tool that helps you maintain control over your macronutrient intake. Allocate time each week to plan your meals, ensuring they consist of low-carb, high-fat foods that align with your keto diet.

Cravings can be tough, especially when you've become accustomed to having Sourdough Bread in your diet. However, there are ways to tackle this. You can explore keto-friendly bread alternatives made from almond flour, coconut flour, or even cauliflower. You might be surprised by how satisfying these substitutes can be!

Also, try to divert your focus towards enjoying the variety of foods you can eat on the keto diet, rather than dwelling on what you can't. There's a plethora of delicious, hearty, and fulfilling foods that are keto-friendly.

Keto-Compatible Alternatives for Sourdough Bread

While Sourdough Bread is not a viable option for a ketogenic diet due to its high carb content, there are several keto-friendly alternatives that you can enjoy. Let's explore a few of them:

Firstly, there are commercially available, low-carb bread options that are made with alternative ingredients like almond flour and coconut flour. These breads often have a significantly lower net carb content compared to Sourdough Bread. For instance, a slice of low-carb almond flour bread may contain only 2-3 grams of net carbs, making it a substantially more keto-friendly choice.

Secondly, lettuce wraps provide an excellent low-carb alternative to Sourdough Bread. They are versatile, fresh, and can be filled with a variety of tasty keto-friendly fillings. A large leaf of romaine lettuce only contains about 1 gram of net carbs. Using lettuce wraps for your sandwich or burger can dramatically lower your carb intake compared to using Sourdough Bread.

Another creative option is using cauliflower to make a bread-like base for dishes like pizza. A 100-gram serving of cauliflower contains only about 3 grams of net carbs and can be used to create a delicious, crispy keto-friendly crust.

Eggplant and portobello mushrooms can also serve as unique, low-carb substitutes for Sourdough Bread in dishes like burgers or sandwiches. A 100-gram serving of eggplant contains just 2.88 grams of net carbs, while a similar serving of portobello mushrooms contains only 3.87 grams of net carbs.

Concluding Thoughts on Sourdough Bread and Keto

Navigating the world of ketogenic dieting presents numerous challenges and considerations, particularly when it comes to bread options, such as Sourdough Bread. We've thoroughly examined the high net carb content of Sourdough Bread and highlighted the risk it poses to maintaining a state of ketosis. With nearly 50 grams of net carbs in a 100-gram serving, it's evident that Sourdough Bread doesn't align with the strict carb limits of the keto diet.

While Sourdough Bread is nutritionally rich and offers some health benefits, such as digestive support due to its probiotics and a lower glycemic index compared to many other breads, its incompatibility with a ketogenic diet cannot be overlooked. Keto dieters must instead look for low-carb substitutes that can offer a similar level of satisfaction.

We've proposed a variety of viable alternatives, ranging from commercially available low-carb breads made from almond or coconut flour to innovative substitutes like lettuce wraps, cauliflower crusts, and even slices of eggplant or portobello mushrooms. These alternatives not only drastically lower the carb intake but also introduce you to new flavors and textures.

The journey towards an effective and satisfying keto diet involves culinary creativity and nutritional awareness. Here's an additional idea: why not explore the kitchen and try cooking your own keto-friendly bread? Numerous recipes are available that utilize low-carb ingredients like almond or coconut flour, flaxseeds, or even cheese. This could be a fun way to experiment with different flavors while maintaining the control over your carb intake.

Explore our Is It Keto Knowledge Hub.

Is Scone Keto-Friendly
Are Breads Keto Friendly

Cast Iron Keto's Editorial and Research Standards

Certain rare or exotic food items may not have nutritional profiles in the FoodData Central database. If an exact match is not found in the FoodData Central database, then, the Cast Iron Keto team utilizes a three-prong approach to provide readers with the closest relevant nutritional data, where possible.

First, in the event that nutritional profiles for a rare or exotic food item is not available in the FoodData Central database, we investigate alternative names for that particular food item and use that data, when possible. Second, in cases where no alternate names exist, Cast Iron Keto will use nutritional data for a close relative or similar food item. Finally, if no close relatives or similar items exist, we refrain from publishing nutrient data tables.

When making dietary or health decisions based on FoodData Central's data, we suggest readers consult with a nutritionist or other health experts, particularly if the food in question has a significant role in your diet or if you are using the food item to treat any health disorder(s).

Furthermore, it is important to note that even if a close relative or similar item is used to approximate the nutritional data, different food items can have varying levels of nutrients due to factors such as soil quality, farming practices, and regional differences.


The information on this website is only intended to be general summary information for public use, designed for educational purposes only and is not engaged in rendering medical advice or professional services. This information does not replace written law or regulations, nor does it replace professional medical advice, diagnosis, or treatment. If you have questions about a medical condition or are seeking to evaluate the health merits of certain food items for the treatment of any medical condition, you should seek the advice of a doctor or other qualified health professionals.

The views expressed at, or through, Cast Iron Keto are for informational purposes only. Cast Iron Keto cannot guarantee the validity of the information found here. While we use reasonable efforts to include accurate and up-to-date information, we make no warranties as to the accuracy of the content and assume no liability or responsibility for any errors or omissions in the content. All liability with respect to actions taken or not taken based on the contents of this website are hereby expressly disclaimed. The content on this posting is provided "as is;" no representations are made that the content is error-free.

Frequently Asked Questions

The primary reason is its high net carb content. With nearly 50 grams of net carbs per 100-gram serving, this significantly exceeds the daily carb limits of a typical ketogenic diet.

No, even variations of Sourdough Bread, like those made with whole wheat or rye, tend to have high net carb contents, making them non-keto-friendly.