Want Gut Health? Take Prebiotics (not Probiotics)

 In Health Blog

Prebiotics are the food that grows and sustains the good bacterial colonies.

In my clinic, I almost always recommend prebiotics to clients when trying to increase good bacteria in the gut; sometimes, I recommend prebiotics instead of probiotics.”

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Why?  Research has shown that once we stop taking a probiotic, the number of good bacteria inevitably returns to pre-probiotic levels. Essentially, our gut bacteria diversity and numbers are set by the time we’re adults. However, there are a few things we can do to change these set points and increase our bacterial diversity and the number of colonies in our gut. When we take prebiotics, good bacterial colonies become more plentiful. More good bacteria equals better health.

Of course taking probiotics, if done correctly, remains important. I still use them with my patients with good success. As my last article pointed out, however picking the correct strains are important. See my article, “Probiotics: Wasting Your Money?”.

What is a prebiotic? A prebiotic is a non-digestible food ingredient (usually fiber or starch) which promotes the growth and activity of health-promoting microorganisms / bacteria (such as bifidobacteria and lactobacilli) in the intestines.

Research has shown prebiotics contribute to the integrity of the gut barrier, promote normal colon transit time, improve nutrient absorption, strengthen the immune system (in the gut and systemically), and modulate blood sugar and lipid levels. Thus, prebiotics have shown to have diverse effects on health, including:

  • gut health maintenance
  • colitis prevention
  • cancer inhibition
  • immune-potentiation
  • cholesterol removal
  • reduction of cardiovascular disease
  • prevention of obesity and constipation
  • restoration of the vaginal ecosystem

Prebiotics occur naturally in many foods, however, eating them raw can be important.

Prebiotic Foods:

  • Acacia gum (or gum arabic)
  • Raw chicory root
  • Raw Jerusalem artichoke
  • Raw dandelion greens
  • Raw garlic
  • Raw leek
  • Raw onion
  • Cooked onion
  • Raw asparagus
  • Raw Wheat bran
  • Baked wheat flour
  • Raw Banana
  • Mexican yams
  • Human milk
  • Colostrum

I suggest getting 12 grams of prebiotic fiber / carbohydrate per day. Though it’s difficult to get some of these prebiotics into our diet, there are good supplements we can take. Just as with probiotics, taking a random product might not be the best idea. Knowing the different kinds of prebiotics, targeting your specific condition, and understanding which bacteria you are trying to grow is helpful.

Here are some prebiotics that I use in my clinic. More are consistently emerging with ongoing research.

Inulin-type fructans. Fructans are found in wheat, onions, asparagus, bananas, garlic, artichokes, and leeks. Chicory root is a major commercial source. These prebiotics mostly feed the Bifidobacterium family of bacteria, but also increase numbers of Lactobacillus and the important butyrate-producing Eubacterium and Roseburia species.

Galactooligosaccharides is found in human and cow’s milk and selectively augments Bifidobacterium and Lactobacillus. 

Lactulose is a galacto-fructose made by the isomerization of lactose. It increases Bifidobacterium and Lactobacillus numbers, and reduces the bad bacteria, Clostridium perfringens, Bacteroides, Enterobacteriaceae, and Streptococcus populations.

Beta-Glucan are non-digestible polysaccharides. They are found in cereals, yeast (e.g. brewer’s yeast), mushrooms, seaweeds and some bacteria. Of note, different types of beta-glucans produce different effects on the body. Effects may include:

  • immune stimulation
  • anti-tumor properties
  • blood cholesterol lowering capacity
  • inhibiting the early stages of atherosclerosis

Larch Arabinogalactan (Larix occidentals) is a fiber that ferments in the intestine and increases the good bacteria, such as Lactobacillus, as well as other beneficial effects on the digestive tract health. This fiber is used for a wide range of immune disorders. Clinically I often use it to:

  • prevent and treat the common cold and flu

Larch has a wide range of conditions it can benefit, for example:

  • H1N1 (swine) flu
  • Ear infections in children
  • Liver cancer
  • Hepatic encephalopathy, (a brain condition caused by liver damage).
  • Lowers cholesterol

Guar Gum: Diabetes & Blood Sugar Levels 

Guar gum increases both Bifidobacteria and Lactobacillus, and helps to reduce symptoms of Irritable Bowel Syndrome (IBS). It also increases immune function. Further effects include:

  • Reduction of fasting blood glucose
  • Improvement in glycemic control
  • Reduction of insulin requirements in insulin-dependent diabetics
  • Reduction of LDL cholesterol

Here is a summary of some of the current research and recommendations for specific conditions and the prebiotics used to address them.

Normalize bowel transit time

  • 20 gm/day inulin (elderly)
  • 20 gm/day lactulose (healthy subjects)
  • 2 gm/day xylooligosaccharides (pregnant woman)

 Improve mineral absorption:

  • 10 gm/day inulin-type fructan (postmenopausal women)
  • 10 gm/day lactulose (postmenopausal women)
  • 8 gm/day inulin-type fructans (pubertal males and females)

Favorably influence blood lipids

  • 7-20 gm/day inulin-type fructans (healthy, type-2 diabetic, hyperlipidemic subjects)

Increase pathogen resistance

  • 15 gm/day inulin and inulin-type fructans (healthy subjects)
  • 20 gm/day lactulose (healthy subjects)
  • 1 gm/dL galactooligosaccharides/inulintype fructans (9:1) (infants)

Enhance systemic immunity

  • 8 gm/day inulin-type fructans (elderly)
  • 8 gm/L galactooligosaccharides/inulintype fructans (9:1) (infants)

Attenuate GI inflammation

  • 15 gm/day inulin-type fructans (Crohn’s disease patients)
  • 12 gm/day inulin-type fructan (ulcerative colitis patients)

(Recommendations from Klair Labs)


When should I take prebiotics?

Prebiotics should be taken with a meal.

Do I need to take probiotics with prebiotics? 

No. Prebiotics have been shown to have beneficial effects when taken alone. However, pairing the right prebiotic with the correct probiotic is best. To review how to pick a good probiotic see my previous article, “Probiotics: Wasting Your Money?

Do prebiotics cause side-effects?

Some people have discomfort / bloating when they start taking prebiotics. Therefore, one should start slowly. If this does not remedy the situation, then consult your health practitioner and consider conditions such as small intestinal bacterial overgrowth (SIBO).

How do you know if you need prebiotics?

Prebiotics essentially come from fiber. It is my clinical opinion that almost everyone could benefit from additional fiber. For example, a modern westerner may eat 20-25 grams of fiber a day, whereas ancestral humans ate ~125 grams a day. Imagine hunters and gathers finding wild vegetables, I imagine they ate even the stalks, which are full of fiber.

This said, I do not know of any test or set of symptoms pointing the need for prebiotics. Yet anyone with compromised health, and those who want to stay healthy may benefit from taking prebiotics.

It is best to consult with a healthcare professional to know how you may benefit and to discern which prebiotic is best for you.

I would love to hear any questions or comments. In health, Jason…

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Showing 10 comments
  • Alexander

    Hi Jason, my brother has recommended me probiotics. Your point on prebiotics vs probiotics will help me to implement of this idea. While thinking about this, i realized that I have a concern. I tried to post it on your blog, but got an error message iafter trying to post it. Here it is below ***********
    This article opens my eyes on prebiotics (and probiotics). But… Chinese medicine is based on Qi. As well as health is. Chinese herbal compounds usefulness is based on the characteristics of Qis it provides. Maybe this is not really so, if we have to consume prebiotics/probiotics. The ancients have not heard of prebiotics, but some of them have lived hundreds of years as much as 857 years or more. How is this possible? Is the problem that we live in cities in multistory buildings? I am not. I live in a small town in a house surrounded by a yard with trees. I do qigong, but my gut is still challenged. The problem is most likely ignorance in qigong and not using the right herbs. Yet the problem is not using prebiotic’s??!! I am willing to use them. I just want to also be sure that I have sound reasons to pay attention to relatively novel items such as prebiotics. Since the root of health seems to be in abundance and quality of shen, jing and QI. This takes time to achieve. If we hunt for things such as prebiotics, the 3 treasures might get scattered and no amount of prebiotics will correct that problem. I am simply concerned that for the first 70 years possibly, we may hunt for whatever we like to get, such as prebiotics. After that time has passed away, we either are able to continue doing what we have done or if we have to switch to something really important, the time for that would not be available. Our resources have been scattered beyond repair.

    • Jason Blalack

      Hi Alexander, There is a lot here to comment on, hence my delay. Chinese medicine has a certain model for viewing the world and the body. It is ancient wisdom and extremely valuable. But it is just one viewpoint / one lens. Western medicine and science has a different lens and has discovered incredible new information about health. It is also valuable.

      Ancients were riddled with diseases also. In general the population as a whole, as far as I understand, were not living longer than we do now. I understand there are stories of long living individuals, and am not sure what to do with these. With science we notice that ancient man though ate over 100-120 grams of fiber a day. Now we eat around 20grams a day. Prebiotics are essentially fiber and carbohydrates that we ourselves do not digest. Such food, like fibrous stalks, have been weeded out of the diet. These are important to our health and feed our bacteria, hence give us longevity. So through science we learn what was working for ancients and what was not. Prebiotics are one of those things that makes sense to me at least. But I agree there are many “new” discoveries that never pan out and ancient simple wisdom sometimes trumps complex new theories. We should tread lightly with “newness” and all must figure out what makes sense to us. I finality, I believe good bacteria in our gut directly relate to Spleen Qi and prebiotics feed this. Please let me know your thoughts or further questions. -Jason

  • Azrul Daud

    Thank you for your very informative and interesting write-up on pre and probiotic. I believe there many more herbs that are prebiotic in nature especially from tropical rainforests that need to be explored.

    • Jason Blalack

      I agree, it is a new field of study, growing rapidly!

  • Brenda

    I have Lyme disease, coinfections, neurological issues, severe anxiety, depression and insomnia etc. Plus I am about to start detoxing for parasites. I use many supplements, herbs,etc.Any thoughts would be greatly appreciated. I also take a raw probiotic from Garden of Life. …how would you rate this probiotic? Thank you!

    • Jason Blalack

      You need to have an expert evulate your condition (since so much is going on) to pick a proper probiotic and path. I cannot know from this information alone, but would be happy to do a Skype consult with you to help guide you. -Jason

  • Sean Walsh

    Hi Jason, i have had psoriasis now for many years and its getting worse n worse. Just wondering if you would be interested in assisting me? I live in Australia. Would love some help if can assist at all?

    • Jason Blalack

      I would be happy to help. We can do some Skype consults if you like. -Jason

      • Sean Walsh

        That would be awesome Jason. Can you send me your email and will sort out with you mate. Thanks so much

      • Sean Walsh

        Awesome Jason thanks so much. When you get a chance can you email me some details and will organise to skype with you. Look forward to it and thanks again. [email protected]

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