Since releasing Fast Tract Digestion Heartburn, I have received several inquiries about using the Fast Tract Diet program to treat other SIBO-related conditions. The answer is yes! That’s the reason Fast Tract Digestion is a book series. More books are coming. In the meantime, the diet can be used for all SIBO-related health problems. This article also reviews several other diets reported to improve SIBO along with the Fast Tract Diet.
What is SIBO?
In healthy people, the small intestine contains low levels of friendly bacteria such as Lactobacillus acidophilus, especially in the upper part of the small intestine where our own critical digestion takes place. SIBO involves the invasion of the small intestine with much greater numbers of bacteria from the large intestine. The official definition of SIBO is “the presence of an abnormally high number of bacteria (more than 100,000 bacteria per milliliter) in the upper part of the small intestine”. At this level, the normally harmless bacteria that live in our gut can become harmful. They produce toxins, enzymes, and intestinal gases, including hydrogen, methane, and carbon dioxide that can disrupt digestion, cause intense physical discomfort and even damage the small intestine.
The symptoms of SIBO include abdominal pain or cramps, diarrhea, constipation, gas, bloating, acid reflux, flatulence, nausea, dehydration and fatigue. More severe symptoms related to SIBO can include weight loss and “failure to thrive,” steatorrhea (the body’s failure to digest fats), anemia, bleeding or bruising, night blindness, bone pain and fractures, leaky gut syndrome, and autoimmune reactions, among others.
There is an abundance of scientific research linking SIBO to a growing number of digestive (and even systemic) conditions. The list continues to grow but already includes:
- Celiac disease
- Crohns disease
- Chronic acid reflux
- Autoimmune disorders
- Cystic fibrosis
SIBO has many underlying causes, but here some that stand out:
- Slowed peristalsis – how well food moves through the intestine
- Low stomach acidity
- Immune deficiency
- Antibiotic usage
- Food poisoning
- Carbohydrate malabsorption (key for dietary control)
Though each of these issues could increase your chances of having SIBO, the driving force behind SIBO is always poorly absorbed carbohydrates. That’s because gut bacteria consume mostly carbs for energy. For this reason, the best way to control SIBO is to deny gut bacteria the fuel they need to overrun the small intestine by limiting the consumption of certain carbohydrates. The worst offenders are the hard-to-digest carbohydrates including lactose, fructose, resistant starch, fiber and sugar alcohols (while sugar alcohols are not carbs, they can be fermented by bacteria). Fast Tract Digestion considers these hard-to-digest carbs as having “fermentation potential” or FP. Limiting FP, as opposed to overall carbs, is the secret of lasting symptoms relief.
Back to the question, “Can the Fast Tract Diet be used to treat other SIBO-related conditions?” The answer is yes, although specific conditions may have additional requirements. For instance, any diet for celiac disease would require all gluten (even small amounts) to be removed. With this in mind, the Fast Tract Diet is specifically designed to treat SIBO by limiting the carbohydrates (listed above) that drive bacterial overgrowth. The idea is not new. Other diets have been used to treat SIBO-related conditions. These include the Paleo Diet, Elemental Diet, Specific Carbohydrate Diet (and the related GAPS Diet), Low Starch Diet, Low Carb Diet and the FODMAP approach. These diets all limit carbohydrate malabsorption to varying degrees. Let’s take a closer look at each.
The Paleo Diet – Did Cavemen get Heartburn?
Paleo diet experts make a rational case that eating like our ancestors ate is healthier. The reason is, our bodies evolved in balance with the foods that were available before we learned to cultivate grains.
You hear different opinions on the details as no one knows for sure what paleolithic humans ate or what their diets were like locally. More fruits would be available in tropical areas. People near lakes, rivers or the ocean relied more heavily on aquatic foods. Hunting was a common thread as supported by fossil records. Foods tended to be uncooked and many foods we tend to dismiss in the modern Western world (i.e. insects) were likely part of the caveman diet.
I have gained a general view of paleo diet foods from reading two great books, The Paleo Solution, by Rob Wolf and The Primal Blueprint by Mark Sisson. Another excellent source of information on paleo eating is the web site, Paleohacks. com. I also attended the Ancestral Health Symposium in Cambridge Massachusetts last August. My take away message is this.
”Modern paleo diets are based on a relatively short list of food types because that’s what was available during our evolution.”
- Fish, meats; including organs, fowl and eggs
- Green vegetables, fruits, nuts, seeds and herbs
- Grains including rice (though Mark’s plan allows some wild rice)
- Beans and pulses
- Dairy and foods containing dairy
- PUFA-containing oils except olive and coconut oil
- Processed foods containing sugars and trans fats, nitrates and other additives.
Clearly, this diet is a big step in the right direction for gut health! The paleo diet removes or limits many difficult-to-digest carbohydrates that are tied to SIBO.
Let’s take a closer look at paleo diet foods to see if some might give Mark’s caveman, Grok, a little indigestion.
Removing the grains beans, pulses, dairy, and processes sugars should make a big improvement in reducing SIBO-related symptoms. But, I would advise caution on some of the other “acceptable” food choices when experiencing symptoms.
Wild rice likely has a relatively low glycemic index and high fermentation potential (FP) due to resistant starch. Unfortunately, I can’t confirm this fact without a GI value and I don’t believe wild rice has been tested. I would recommend jasmine rice with an FP value of zero. But, don’t eat too much if you have high blood sugar or insulin resistance.
How about fruit? Many fruits contain high amounts of fructose. Because fructose is a single sugar, it requires no digestion, but it’s absorbed slowly into the bloodstream. This makes it more available for excessive fermentation in the gut. There are many studies liking fructose consumption to gut problems, especially IBS symptoms. Apples, pears, cherries, grapes, plums, are examples of fruits containing a lot of fructose.
Another fruit that can create issues is bananas. Bananas have a lot of resistant starch, especially under-ripe bananas. Resistant starch, like all difficult to digest carbs, hangs around providing gas-producing bacteria fuel.
What about dairy? Dairy is restricted on the paleo diet because it wasn’t available throughout our evolution. For gut health, the major issue is lactose. I agree that high lactose dairy such as milk and ice cream (there is lactose-free ice cream available) should be avoided. I don’t see the benefit of excluding heavy and light cream, lactose-free milk, cheeses, plain yogurt and other fermented dairy. I personally can’t imagine life without them.
Of particular interest are tubers, which are allowed on many paleo diets. Tubers include potatoes, sweet potatoes, parsnips, celery root, carrots, beets, daikon, yams, and turnip. Some tubers contain significant amounts of resistant starch and need to be avoided. See my recommendations at the end of the article for safe tubers.
The Elemental Diet
The Elemental diet consists of foods that are essentially “predigested.” The foods contain fatty acids rather than fats, amino acids rather than proteins, and glucose instead of carbohydrates. The diet formula also includes water and micronutrients — vitamins and minerals. Elemental diet product such as Nestle’s Vivonex can be delivered orally or enterally (by tube). Elemental diets are designed to ensure full absorption and have been used to treat a broad range of digestive conditions including: Crohn’s and celiac disease, lactose intolerance, malabsorption, diarrhea, constipation, diabetes, cystic fibrosis, abdominal distention, and short bowel syndrome. Note that all of these conditions have some connection to SIBO. Some of the drawbacks of the elemental diet approach include high cost, unappealing (predigested!) food products, and the need for medical supervision.
The Specific Carbohydrate Diet
The book Breaking the Vicious Cycle by Elaine Gottschall describes her experiences with Drs. Sidney and Merrill Haas, who successfully treated celiac disease with a diet that allowed only specific sugars and starches. The Specific Carbohydrate Diet limits disaccharide or double sugars as well as grains and starch, but allows simple sugars like glucose.
In general, this dietary approach is on the right track, but it fails to limit a number of known contributors to SIBO-related illness. For example, honey is used extensively in the recipes even though honey has just as much fructose as table sugar (sucrose is made of equal parts glucose and fructose). And the diet also allows a large variety of fruits and fruit juices that also contain large quantities of fructose, which is now recognized as a major contributor to the development of SIBO.
Finally, the SCD does not allow any grains or foods containing starch. It wrongly identifies amylose starch as easy to digest and amylopectin starch as difficult to digest, suggesting that amylopectin and not amylose is more likely to cause problems. The reverse is actually true.
Note: The GAPS Diet (Gut and Psychology Syndrome) created by Dr. Natasha Campbell-McBride is based on the Specific Carbohydrate Diet but also includes detoxification, and supplementation.
The Low Starch Diet
Carol Sinclair popularized the Low Starch Diet in her book The IBS Low-Starch Diet. Sinclair discovered that reducing starch in her diet improved her IBS symptoms. She also collaborated with Dr. Alan Ebringer, a professor of immunology at Kings College in London, UK, who found that the diet could improve painful symptoms of ankylosing spondylitis (AS). Dr. Ebringer has made the connection between the autoimmune disease AS, intestinal overgrowth of the bacterium Klebsiella pneumonia, and controlling the bacteria’s growth through a low-starch diet. Sinclair’s book limits all starches as well as sucrose, lactose and maltose.
Unfortunately, like the Specific Carbohydrate Diet, the Low Starch Diet unnecessarily limits all starch, yet does not limit fructose, and will not be completely effective in treating SIBO.
The Low Carb Diet
The book Protein Power by Drs. Mike and Mary Dan Eades documented how low-carb dieting helped people with heartburn. Clinical studies have also shown that strict (ketogenic) low-carb dieting can improve IBS and GERD, two conditions associated with SIBO.[i] Despite impressive results (as documented in my first book, Heartburn Cured), not everyone gets complete symptom relief from a low carb diet. One possible explanation for the variations in results is that the low-carb diets don’t restrict fiber — another well-known contributor to SIBO-related digestive illness. Another reason might be a simple failure to stick with the diet.
The FODMAP Approach
Susan Shepherd and Peter Gibson developed the FODMAP diet at Monash University in Victoria, Australia.[ii] The acronym FODMAP represents four classes of fermentable sugars/sugar alcohols: Fermentable Oligo-, Di-, and Monosaccharides, And Polyols.[iii] The FODMAP approach limits fructose, fructans, lactose, galactans and sugar alcohols.
One flaw in the FODMAP approach is that it fails to limit resistant starch, a significant contributor to malabsorption and excessive fermentation. In fact, the FODMAP diet calls for adding more resistant starch. As a recent article on the diet stated, “Part of dietary counseling is to ensure continuing adequate intake of resistant starch.”[iv] Another drawback of the FODMAP system is that a trained dietitian must deliver it.[v]
The Fast Tract Diet – New Way to Treat SIBO
The Fast Tract Diet limits all difficult-to-digest carbohydrates including fructose, lactose, fiber, resistant starch and sugar alcohols. But the diet uses a special method called Fermentation Potential (FP) to calculate the potential for any food containing carbohydrates to cause symptoms. Mathematically derived FP values (they are listed in tables but can also be calculated) for each food help identify and restrict difficult-to-digest carbohydrates without having to know what carbs are in each food. So you don’t need the help of a medical professional or dietician.
Unlike a strictly low-carb diet, the Fast Tract Diet limits fiber, but can include some higher-carb foods as long as they don’t contain too many difficult-to-digest carbohydrates. For instance, sushi rice, which contains little resistant starch, is acceptable, but basmati rice, which contains more resistant starch, is not. The Fast Tract Digestion book series also explains and addresses the other underlying problems listed above that can contribute to SIBO.
Here are four recommendations to control SIBO and limit symptoms:
- Limit rice containing amylose starch – high FP. Low amylose rices (such as Asian glutinous or sticky rice) are safe for gut issues.
- Limit tubers containing amylose starch – high FP. There are other low FP tubers such as parsnips, Pontiac potatoes, celery root and daikon.
- Limit high fructose fruits – high FP. Low FP fruits include watermelon, strawberries, blueberries, etc. Consume other fruits, such as melon, pineapple, pears, peaches, apples, lemon, lime and oranges as single slices or small wedges.
- Limit dairy with lactose – high FP. Acceptable are heavy and light cream, fermented dairy products including plain yogurt and cheeses.
Note: Some low FP vegetables, while gut friendly, are high carb. Use your judgment to avoid metabolic complications from high blood sugar, such as diabetes, obesity and cardiovascular health.
Question: What foods cause you digestive problems?
[i]Yancy WS Jr, Provenzale D, Westman EC. Improvement of gastroesophageal reflux disease after initiation of a low-carbohydrate diet: five brief cased reports. Altern Ther health med. 2001. Nov-Dec; 7(6):120,116-119. Austin GL, Thiny MT, Westman EC, Yancy WS Jr, Shaheen NJ. A very low-carbohydrate diet improves gastroesophageal reflux and its symptoms. Dig Dis Sci. 2006 Aug;51(8):1307-12. Austin GL, Dalton CB, Hu Y, Morris CB, Hankins J, Weinland SR, Westman EC, Yancy WS Jr, Drossman DA. A very low-carbohydrate diet improves symptoms and quality of life in diarrhea-predominant irritable bowel syndrome. Clin Gastroenterol Hepatol. 2009 Jun;7(6):706-708.
[iv] Peter R Gibson, Susan J Shepherd. Evidence-based Dietary Management of Functional Gastrointestinal Symptoms: The FODMAP Approach. J Gastroenterol Hepatol. 2010;25(2):252-258.
[v] Gibson, P, Shepherd, S. Evidence-based dietary management of functional gastrointestinal symptoms: The FODMAP approach. J Gastroenterol Hepatol. 2010 Feb ;25 (2):252-8, 20136989f.