
Small intestinal bacterial overgrowth (SIBO) occurs when bacteria that usually grow in one part of the digestive tract, like the colon, start growing in the small intestine. The goal of treating SIBO is to restore a healthy balance of gut bacteria. While antibiotics are the primary treatment for SIBO, some people use an elimination diet to identify connections between their diet and SIBO symptoms. One common elimination diet is the low-FODMAP diet, which focuses on limiting certain types of carbohydrates that are not easily digestible. FODMAPs include fructans, fructose, galactans, lactose, and polyols, which are found in foods such as wheat, vegetables, fruits, honey, legumes, dairy, and certain vegetables. While the low-FODMAP diet is popular, it should be done under the supervision of a dietitian as it is restrictive and there is limited evidence of its effectiveness for SIBO. In this context, we will explore whether corn is allowed on a SIBO diet.
| Characteristics | Values |
|---|---|
| Corn allowed on SIBO diet? | Corn is not allowed on the SIBO diet as it contains high-fructose corn syrup, which is a FODMAP food. FODMAP foods contain short-chain carbohydrates that are difficult to digest and can increase fermentation in the intestines, exacerbating SIBO symptoms. |
| What is SIBO? | Small intestinal bacterial overgrowth (SIBO) is a condition where there is an overgrowth of bacteria in the small intestine, leading to symptoms like bloating, gas, and changes in bowel movements. |
| Treatment | There is no proven diet to treat SIBO. The first line of treatment is antibiotics. Doctors may also recommend an elimination or elemental (liquid) diet to identify trigger foods and manage symptoms. |
| FODMAP diet | A low-FODMAP diet is a common approach to managing SIBO. FODMAP stands for Fermentable Oligosaccharides, Disaccharides, Monosaccharides, and Polyols. It involves limiting certain carbohydrates that feed gut bacteria and promote fermentation. |
| Other recommendations | Experts recommend limiting sugar and alcohol sugars as they can disrupt the balance of gut bacteria and increase inflammation. Some suggest limiting fiber, while others recommend a high-fiber diet. Working with a dietitian is advised to determine individual trigger foods and safe foods. |
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What You'll Learn

Corn syrup is a no-go
If you have Small Intestinal Bacterial Overgrowth (SIBO), you may be wondering what you can and can't eat. SIBO is a bacterial overgrowth in the small intestine, and it can cause pain, diarrhoea, and malnutrition. Antibiotics are the first line of treatment, but some people also claim that limiting certain types of food or changing your eating pattern can help.
Corn syrup is one of the foods that people with SIBO may want to avoid. This is because it is a high-FODMAP food. FODMAP stands for Fermentable Oligosaccharides, Disaccharides, Monosaccharides, and Polyols. These are short-chain carbohydrates that are difficult for some people to digest. The process of bacteria digesting these foods causes increased fermentation in the intestines, which may make SIBO symptoms worse.
High-FODMAP foods include foods with glucose, fructose, maltose, and sucrose. Honey and high-fructose corn syrup are also high-FODMAP foods. Other high-FODMAP foods to avoid include maple syrup, sugar-free and fruit-flavoured pancake syrup, jams, jello, Karo syrup, brown rice syrup, and crystalline fructose.
If you are considering an elimination diet for SIBO, it is important to plan it out with the help of a registered dietitian. They can help you build a list of foods to cut out temporarily and advise on how and when to reintroduce foods.
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High fructose corn syrup is a FODMAP
Corn is allowed on a SIBO diet, but it is recommended to work with a dietitian to determine your trigger foods. Experts recommend cutting out alcohol sugars and other fermentable sweeteners, as well as foods with glucose, fructose, maltose, and sucrose.
High fructose corn syrup (HFCS) is considered a FODMAP. FODMAP is an acronym for Fermentable Oligosaccharides, Disaccharides, Monosaccharides, and Polyols. These foods contain short-chain carbohydrates that are difficult for some people to digest, especially those with irritable bowel syndrome. The bacteria in the intestines digest these foods, causing increased fermentation in the intestines, which may worsen SIBO symptoms.
High fructose corn syrup is typically about 55% fructose and 40% glucose, making it high in FODMAPs. HFCS can be labelled under multiple names, such as glucose-fructose in Canada, or isoglucose in Europe. It is important to read labels and watch out for these ingredients, as they can contain excess levels of fructose.
Fructose is absorbed efficiently in the presence of equal or greater amounts of glucose. However, when there is more fructose than glucose, it is not absorbed well and can result in gastrointestinal symptoms such as loose stools due to the osmotic effects of fructose in the gut. Therefore, it is recommended to avoid processed foods containing HFCS during the initial stage of a low FODMAP diet.
It is important to note that corn syrup is not the same as high fructose corn syrup. Corn syrup is considered low FODMAP as it is predominantly made of glucose.
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Cornbread is allowed
The goal of a SIBO diet is to restore a healthy balance of gut bacteria and manage symptoms. One popular approach is the low-FODMAP diet, which focuses on limiting certain carbohydrates that are hard to digest and feed bacteria, leading to increased fermentation and symptoms. FODMAP stands for Fermentable Oligosaccharides, Disaccharides, Monosaccharides, and Polyols, which are types of short-chain carbohydrates.
While cornbread is allowed on a low-FODMAP diet, it's important to remember that this diet is restrictive and should be done under the supervision of a registered dietitian. Cornbread may be allowed, but high-FODMAP foods like honey, high-fructose corn syrup, and some fruits and vegetables should be avoided. The diet should be carefully planned and monitored to ensure you're meeting your nutritional needs.
Additionally, the low-FODMAP diet is not meant to be followed long-term. It's typically recommended for 2-6 weeks initially, and most people shouldn't continue beyond 6 months without reintroducing higher FODMAP foods. This diet is meant to rebalance your gut microbiome, not create ongoing food intolerances. Antibiotics are also a standard treatment for SIBO, and a registered dietitian can help determine the best approach for managing symptoms.
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Corn flakes are not recommended
Corn flakes are a type of breakfast cereal made primarily from milled corn. While corn itself is not explicitly mentioned as a food to avoid in a SIBO diet, there are several reasons why corn flakes may not be suitable. Firstly, cereals, in general, are often processed and refined, which can contribute to gut inflammation and disrupt the balance of gut bacteria. Secondly, corn is a source of fructose, which is a FODMAP. FODMAPs are short-chain carbohydrates that can be difficult for some people with SIBO to digest and can lead to increased fermentation in the intestines, exacerbating symptoms.
Additionally, corn flakes are often high in sugar, which can further imbalance gut bacteria and increase inflammation. Sugar feeds unhealthy bacteria in the gut and can worsen SIBO symptoms. Corn flakes may also contain other additives or ingredients that are not SIBO-friendly, such as high-fructose corn syrup, which is specifically listed as a food to avoid in a SIBO diet.
It is important to note that the specific triggers for SIBO symptoms can vary from person to person. Working with a registered dietitian or healthcare provider is crucial to determine your individual trigger foods and develop a personalised SIBO diet plan. They can guide you in gradually reintroducing eliminated foods and ensuring you meet your daily nutritional needs. While corn flakes may not be recommended, there are other breakfast options that may be suitable for a SIBO diet, such as eggs, unsweetened peanut butter, nuts, and certain types of bread in moderation.
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Popcorn is a soy product to avoid
Popcorn is a popular snack, and there are many soy-free options available. Popcorn is not a soy product, and it is not derived from soy. However, some people may choose to avoid it as part of a soy-free diet.
A soy allergy is the body's abnormal response to the proteins found in soy. Those with a soy allergy must stay away from all foods or products containing soy. Soybeans are classified as legumes, and other legumes include various types of beans, chickpeas, lentils, and peanuts.
Popcorn is made from a specific type of corn kernel that expands and puffs up when heated. It is a good source of fiber and can be enjoyed in a variety of ways, including buttered, salted, or with other toppings. Many brands offer soy-free popcorn products, such as SkinnyPop and Lesser Evil, which are gluten-free, dairy-free, non-GMO, and vegan.
While popcorn itself is soy-free, some people may choose to add soy-based toppings to their popcorn, such as soy sauce or soy-based seasonings. These toppings can add flavor and variety to plain popcorn. However, for individuals with soy allergies or sensitivities, it is essential to avoid these toppings and opt for alternative seasoning options.
When following a SIBO (Small Intestinal Bacterial Overgrowth) diet, the primary goal is to manage symptoms and maintain a healthy balance of gut bacteria. While popcorn is not explicitly mentioned as a food to avoid, it is important to work with a dietitian to determine your specific trigger foods. A registered dietitian can guide you in planning an elimination diet to identify any connections between the foods you eat and your SIBO symptoms.
In summary, popcorn is not a soy product, and there are soy-free popcorn options available. However, some people may choose to avoid it as part of a soy-free diet or due to specific dietary restrictions related to conditions like SIBO. It is always advisable to seek guidance from a healthcare professional or registered dietitian when making dietary changes to address specific health concerns.
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Frequently asked questions
SIBO, or Small Intestinal Bacterial Overgrowth, is a bacterial overgrowth in the small intestine. A SIBO diet is a dietary plan that can help keep the condition from coming back.
Corn is not allowed on a SIBO diet. High fructose corn syrup is listed as a food to avoid with SIBO. Additionally, cornbread is listed as an acceptable food on a low-FODMAP diet, which is not recommended for SIBO.
The SIBO diet recommended by the University of West Virginia Digestive Health Center includes beef, pork, lamb, chicken, turkey, duck, fish, shellfish, eggs, milk, tofu, tempeh, unsweetened peanut butter, unsweetened almond butter, nuts, seeds, and more.











































