How to Find the Best SIBO Meal Replacement Shake

📌 Overview and Key Takeaways

This is a Dietitian’s guide on how to the best SIBO meal replacement shake.

Discover how to safely support your diet with SIBO.

Last Updated
Jan 11, 2026

Author and Medical Reviewer

Written by Kayla Kamen, MS, RD

Kayla Kamen is a Registered Dietitian with a MS in Nutrition.

Medically reviewed by Jennifer Fossett, PA-C

Jennifer Fossett is a Physician Assistant with a BA in Nutritional Sciences.

Meal Replacement Shakes for SIBO

Are Meal Replacements Good for SIBO?

Small intestinal bacterial overgrowth (SIBO) occurs when there is an overgrowth of bacteria in the small intestine, particularly of types of bacteria that normally grow in other parts of the gut.

This overgrowth can cause digestive issues like stomach pain and diarrhea, and can lead to malnutrition and weight loss in severe cases.

Although SIBO remains a poorly understood disease, it is associated with several chronic conditions including irritable bowel syndrome (IBS), Crohn’s disease, and gastroesophageal reflux disease (GERD) (Gastroenterol Hepatol (N Y), 2007).

The most common treatment for SIBO is antibiotics, which can help decrease the number of bacteria in the small intestine.

Antibiotics will not address the underlying issue that caused SIBO in the first place, however, which is why they are often paired with dietary changes.

One such example is the SIBO diet, which is a temporary elimination diet designed to help determine which foods cause and reduce symptoms.

If you are on the SIBO diet, which takes 2-6 weeks, it is not a great time to introduce a new meal replacement to your diet.

But afterwards, the right meal replacement can help you curb weight loss and malnutrition.

In other words, adding a meal replacement shake to your diet can help you ensure you are meeting your nutritional needs.

Moreover, in some cases, a liquid meal may also be the only thing your stomach can handle.

That said, not all meal replacement shakes are good for SIBO.

What Is the Best SIBO Meal Replacement Shake?

Many meal replacements are made from ingredients known to cause painful side effects and long-term gut health problems for someone with SIBO.

Among these ingredients are food additives, dairy-based proteins, and protein concentrates and isolates.

🚫 Avoid Food Additives

Regularly eating emulsifiers, thickeners, sugar substitutes, and other additives can not only upset your stomach, but also alter the composition of your gut microbiome (North Clin Istanb, 2019).

This can lead to gut dysbiosis, or an imbalance in gut bacteria, which is linked to the development of SIBO (Microorganisms, 2022; Microorganisms, 2023).

In fact, small intestinal bacterial overgrowth can be understood as a type of gut dysbiosis.

SIBO involves an overgrowth of bacteria in the small intestine specifically, whereas gut dysbiosis refers to an imbalance in bacteria in the digestive tract generally speaking.

There is no indication that the latter causes the former, but the two are certainly related, so ingredients that could cause gut dysbiosis should be avoided by people with SIBO.

⚠️ Here is a list of the most common food additives in meal replacements:

• acacia fiber
• acacia gum
• acesulfame potassium
• artificial flavors
• ascorbic acid
• aspartame
• calcium carbonate
• carrageenan
• cellulose gum
• dextrin
• dicalcium phosphate
• dipotassium phosphate
• erythritol
• gellan gum
• guar gum
• gum arabic
• inulin
• locust bean gum
• maltitol
• maltodextrin
• mono- and diglycerides
• ‘natural’ flavors
• rice bran extract
• rice dextrin
• rice hulls
• rosemary extract
• silica
• silicon dioxide
• sodium alginate
• soluble corn fiber
• sorbitol
• soy lecithin
• sucralose
• sunflower lecithin
• tocopherols
• tricalcium phosphate
• xanthan gum
• xylitol
• zinc oxide

Note that this list includes several artificial sweeteners.

Artificial sweeteners like sucralose and acesulfame potassium are among the worst ingredients for your gut microbiome (Nature, 2014).

They both reduce microbial diversity and promote the growth of potentially pathogenic bacteria.

Also note that as a rule of thumb, if you cannot find it in nature or make it at home, it is probably a food additive.

🚫 Avoid Dairy-Based Proteins

Dairy-based proteins like whey and casein, although not an issue for everyone, can cause digestive issues.

This is usually because they contain lactose, a sugar many individuals with sensitive stomachs cannot fully digest.

But you might be sensitive to dairy-based proteins even if you are not lactose intolerant.

This is particularly true for casein protein, which forms a gel-like substance in your stomach that slows down digestion.

🚫 Avoid Protein Concentrates and Isolates

If you have a sensitive stomach, you might also want to avoid ultra-processed protein concentrates and isolates.

Most protein supplements are made from one or both of these ultra-processed protein sources, which have been mechanically and/or chemically stripped of everything but the protein.

This includes the enzymes, fiber, and other natural digestive aids that help your gut break them down.

You therefore do not digest them in the same way that you do whole foods, which could affect your gut health.

Studies show that regularly eating protein concentrates and isolates might disrupt your gut microbiome and cause the formation of toxic byproducts in your gut (Nutrients, 2018; Mol Nutr Food Res, 2024).

Individuals with pre-existing digestive issues should thus look for protein supplements made from whole food protein sources like egg whites and almonds, which are easier to digest and absorb.

Order Samples to see for yourself.

Sources

1. Gastroenterology & Hepatology (Gastroenterol Hepatol (N Y)). Small Intestinal Bacterial Overgrowth: A Comprehensive Review. 2007.
2. Northern Clinics of Istanbul (North Clin Istanb). Food additives and microbiota. 2019.
3. Microorganisms (Microorganisms). Gut Microbiota Dysbiosis: Triggers, Consequences, Diagnostic and Therapeutic Options. 2022.
4. Microorganisms (Microorganisms). Association between Gut Dysbiosis and the Occurrence of SIBO, LIBO, SIFO and IMO. 2023.
5. Nature (Nature). Artificial sweeteners induce glucose intolerance by altering the gut microbiota.. 2014.
6. Nutrients (Nutrients). Effect of a Protein Supplement on the Gut Microbiota of Endurance Athletes: A Randomized, Controlled, Double-Blind Pilot Study. 2018.
7. Molecular nutrition & food research (Mol Nutr Food Res). In Vitro Fermentation of Animal and Plant Protein Isolates by the Human Gut Microbiota Under High and Low Carbohydrate Conditions.. 2024.

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This article was written by a Registered Dietitian and reviewed by a Physician Assistant. We rely on peer-reviewed research and trusted medical sources, and regularly update our content to ensure accuracy and clarity.