Is Keto Bread Good for Diabetics? What the Research Says
Two slices of regular bread add about two carb choices. See how keto bread compares, which sweeteners to check and what the research says.
TL;DR: Keto bread can fit a diabetes eating plan because it has far fewer carbs than regular bread. Two slices of regular bread have about 29–35 g of carbs, roughly two carb choices. A good keto bread has a few grams of net carbs per slice. Check the label for total carbs, fiber, sugar alcohols and serving size, and test your own blood sugar response.
The short answer
For many people with type 2 diabetes, keto bread can be a better fit than regular bread because it delivers far fewer carbohydrates per slice. Carbohydrates are what raise blood sugar most. Fiber does not (CDC).
But “keto” on the bag is not a guarantee. Some keto breads use starch, sugar alcohols or small slices to hit a low number. The label and your own meter tell you more than the front of the package.
This article is for general information only and is not medical advice. If you have diabetes, talk with your doctor or diabetes care team before changing your diet, especially if you take insulin or other glucose-lowering medicine.
How many carbs does bread add?
Every regular bread here lands near two carb choices for a sandwich, even whole grain. Fiber trims it a little, but not much. A keto bread with a few grams of net carbs per slice keeps the same sandwich well under one carb choice.
What the research says about low carb eating and diabetes
The American Diabetes Association supports carb reduction. Its nutrition consensus report says reducing overall carbohydrate intake has the most evidence for improving blood sugar. It also calls low and very low carbohydrate eating patterns a viable option for some adults with type 2 diabetes (diaTribe summary of the ADA consensus report). The same report advises cutting refined grains such as white bread.
Low carb diets helped in short-term trials. A 2021 review in The BMJ pooled 23 trials with 1,357 adults. At six months, 57% of people on low carb diets reached an HbA1c under 6.5%, compared with 31% on other diets. By 12 months, the benefits had mostly faded, and the authors rated the evidence moderate to low (Goldenberg et al., 2021). Sticking with the diet was the hard part.
So bread is not off-limits. The question is how many carbs each slice brings, and what else is in it.
Sweeteners and sugar alcohols: read the ingredient list
Many keto breads use sweeteners or sugar alcohols to replace sugar. They are not all the same:
- Erythritol: a 2023 study in Nature Medicine linked higher blood erythritol levels to more heart attacks and strokes over three years in people at risk of heart disease. In a small test, 30 g of erythritol raised blood levels about 1,000-fold for over two days. This shows a link, not proof of harm (TCTMD report on Witkowski et al., 2023).
- Maltitol and some starches: these still contain carbohydrate the body can absorb, so check total carbs, not only the “net carb” number on the front.
- No added sweetener: many savory breads, like sourdough and seeded loaves, don’t need any.
If blood sugar is your main concern, a bread with no added sugar and no sugar alcohols is the simplest choice to judge.
Is sourdough good for diabetics?
Regular white sourdough is not much different from white bread for blood sugar. A 2022 review of 25 trials found that more than half the studies comparing sourdough with white bread saw no real difference (Ribet et al., 2022). In one trial in overweight men, sprouted-grain bread raised blood sugar less than white sourdough (Mofidi et al., 2012). A low carb sourdough made from high-fiber flour is a different product: check its carbs per slice, not the word “sourdough.”
What about glycemic index?
The glycemic index (GI) ranks how fast a food raises blood sugar compared with pure glucose. It helps, but the total amount of carbohydrate you eat matters more for most people. A small serving of a high-GI food can raise blood sugar less than a big serving of a lower-GI one. That is why carb counting, not GI alone, is the usual starting point.
How to choose a keto bread if you have diabetes
Use the Nutrition Facts panel, not the front of the bag:
- Total carbohydrate per slice. The CDC suggests counting total carbohydrate from the label; one carb choice is 15 g (CDC).
- Dietary fiber. More fiber means fewer digestible carbs. Look for at least 3 g per slice.
- Sugar alcohols and added sugars. Check the ingredient list for erythritol, maltitol, sugar, honey or syrups.
- Serving size. A low number on a very thin slice is not the same as a low number on a full slice. Compare grams per serving.
- Protein. Breads made with wheat protein, eggs or seeds tend to have more protein, which makes a meal more filling.
- Short ingredient list. Fewer starches, gums and sweeteners make it easier to know what you are eating.
If you check your blood sugar at home, ask your care team how to test a new food like this. Responses to the same bread differ a lot from person to person (Ribet et al., 2022). For a deeper guide to labels, see how to read bread nutrition labels, or compare loaves in our guide to the healthiest bread.
Frequently Asked Questions
It can fit a diabetes eating plan because it usually has far fewer carbs than regular bread. Check total carbs, fiber and sugar alcohols on the label, and test your own blood sugar response.
Any food with digestible carbs can raise blood sugar. A keto bread with only a few grams of net carbs per slice will usually raise it much less than regular bread, which has about 14–18 g of carbs per slice.
Look for a bread with low total carbs, at least 3 g of fiber, no added sugar and a full-size slice. High-fiber low carb breads and sprouted whole grain breads are common choices.
White sourdough is close to white bread in carbs and blood sugar effect in most studies. A whole grain or low carb sourdough is a better option.
A 2023 study linked high blood erythritol to heart events, but it showed an association, not proof. If you are concerned, choose breads without added erythritol and ask your doctor.
Bread that fits your carb plan
LowCarb Avenue is a physician-founded low carb bakery in Frederick, Maryland, baking clean-label low carb and keto bread. Our Frankie sourdough is made with a live sourdough starter, high-fiber wheat flour, wheat protein, olive oil and sea salt, with no sugar and no sugar alcohols. It has 3 g of net carbs and 6 g of protein per serving, per our product label. See our breads for diabetics or shop low carb bread at lowcarbavenue.com.
Sources
- Centers for Disease Control and Prevention. Carb Counting. Updated May 15, 2024. Link
- Centers for Disease Control and Prevention. Carb Choices (carbohydrate lists). Updated May 15, 2024. Link
- Evert AB, et al. Nutrition therapy for adults with diabetes or prediabetes: a consensus report. Diabetes Care. 2019 (American Diabetes Association). diaTribe summary
- Goldenberg JZ, Day A, Brinkworth GD, et al. Efficacy and safety of low and very low carbohydrate diets for type 2 diabetes remission: systematic review and meta-analysis. BMJ. 2021;372:m4743. Abstract
- Witkowski M, Nemet I, Alamri H, et al. The artificial sweetener erythritol and cardiovascular event risk. Nat Med. 2023. TCTMD report
- Ribet L, Dessalles R, Lesens C, Brusselaers N, Durand-Dubief M. Nutritional benefits of sourdoughs: a systematic review. Adv Nutr. 2022;14(1):22–29. PMC10103004
- Mofidi A, et al. The acute impact of ingestion of sourdough and whole-grain breads on blood glucose, insulin, and incretins in overweight and obese men. J Nutr Metab. 2012;2012:184710. PMC3317179
- USDA FoodData Central, SR Legacy: Bread, white (174924); whole-wheat (172688); multi-grain (168013); rye (172684); french or vienna, includes sourdough (172675); scaled to a 34 g slice. Food For Life Ezekiel 4:9 label (34 g). fdc.nal.usda.gov
