What Are Prebiotics?

Image of a person holding prebiotic grains

Note: This article may contain affiliate links. If you click a link and purchase a product, Consumer’s Health Report may receive a commission, which allows us to continue to do our research.

Prebiotics are non-digestible fibers, carbohydrates, and certain types of sugar that act as food for probiotic microorganisms that pass through the digestive system.

By eating prebiotics or taking a prebiotic supplement, you can improve the balance of microflora in your gut, which can encourage better overall health.

In this article, we’ll be discussing the difference between probiotics and prebiotics, natural sources of prebiotics, health benefits of prebiotics, prebiotic supplements, and types of prebiotic fiber so that you can get a better idea of whether they could improve your health.

What’s the Difference Between Probiotics and Prebiotics?

Probiotics are living microorganisms (either bacteria or yeast), that promote better health.

Prebiotics are foods (typically fiber) that provide a food source to probiotics.

What Foods are Prebiotics

Prebiotics in natural form come from a wide variety of plant foods.

If you’re looking to increase your intake of natural prebiotics, here are some of the prebiotic foods you can work into your diet:

  • Onions
  • Garlic
  • Bananas
  • Asparagus
  • Apples
  • Oats
  • Barley
  • Wheat bran
  • Seaweed
  • Flaxseed
  • Leeks
  • Jerusalem artichoke
  • Radishes
  • Carrots
  • Tomatoes
  • Yams
  • Cucumbers
  • Bell peppers
  • Sweet potatoes
  • Cabbage

This is by no means a comprehensive list of prebiotic foods. As you can see, there are a lot of options, so even the pickiest of eaters should have some prebiotic foods to work with.

Benefits of Prebiotics

The benefits of prebiotics come both from the prebiotic fiber itself and by being a food source for probiotics.

Some of the potential health benefits that prebiotics are thought to have include:

  • Improved digestion
  • Better colonic health
  • Better immune function
  • May lower risk factors for heart disease
  • Better nutrient absorption, including calcium, magnesium, and iron
  • Promotes satiety (the feeling of fullness after eating), which can help with weight management and obesity
  • Reduces inflammation
  • May protect against colon cancer (1)

Aside from the benefits you get from prebiotics being a fiber, you could make the case that prebiotics and probiotics share a lot of the same health benefits, because probiotics aren’t as effective without prebiotics.

Prebiotic Supplements

If for whatever reason you don’t get enough prebiotic fiber in your regular diet, a prebiotic supplement can be a good option. That’s especially true if you combine it with probiotics.

Not all prebiotic supplements are the same, though. There are several types of prebiotics, which we’ll discuss in this section.

Types of Prebiotic Fiber

There are three main types of prebiotic fiber that both aid in digestion and provide a food source for probiotics: inulin, fructooligosaccharides, and galacto-oligosaccharides.

In this section, we explain these three types of prebiotics and why all of them are important.


Inulin is a form of soluble prebiotic fiber. It’s found in a number of plants.

Inulin is low in calories and is good for digestion even just as a fiber. Inulin can be found as an ingredient in many fiber supplements.

Inulin is made up of fructose molecule chains that can’t be digested by the small intestine, also known as a fructan. This means that it travels undigested to the lower gut, where it acts as a food source for probiotic bacteria and yeast.

Some of the other health benefits thought to be associated with inulin include constipation relief (2), may have benefits in people with diabetes (3) (4) (5) (6), improves mineral absorption so it may strengthen bones (7) (8), it may be beneficial for inflammatory bowel disease (9), it may support heart health (10) (11) (12), and helps provide a healthy balance of the gut microflora.

Inulin does have some potential side effects that you should be aware of, although they are generally minor in nature. Those include: bloating, gas, and abdominal discomfort.


Fructooligosaccharides are a form of carbohydrate made of short fructose chains.

They’re also very high in dietary fiber content and are prebiotics.

Some sources of fructooligosaccharides include bananas, onions, garlic, yacon root, chicory root, leeks, asparagus, and Jerusalem artichokes.

Aside from being a great source of fiber, fructooligosaccharides may also decrease cholesterol levels (13), may fight against harmful bacteria (14), and of course, they’re prebiotic.


Galacto-oligosaccharides are prebiotics made up of plant-based sugars linked together in chain-like structures.

They’re non-digestible, and they provide a food source for probiotics.

Combined with probiotics, galacto-oligosaccharides ferment short-chain fatty acids and gases, “which is effective in genotoxicity, lowering cholesterol, improving infant health and efficient in diseases.” (15)

Sources of Prebiotics

There are various sources from which supplement manufacturers get prebiotics for their prebiotic supplement products.

It’s a good idea to get prebiotics from as many sources as you can. The reason being is that different types of fiber play different roles in digestion and also each probiotic strain has preferences as to which prebiotics they like to feed on.

If you’re getting prebiotics from food (which we should try to do as much as we can for optimal health), then you should aim for getting multiple types of prebiotics in your diet from a wide variety of food.

Likewise, when shopping for a prebiotic supplement, ideally you’d look for a supplement that contains several different types of fiber and prebiotics.

Chicory Root Powder

Chicory is a plant native to Eurasia, but has been transplanted to the United States and other parts of the world, where it grows freely.

Chicory root can be ground up and used to make a beverage that resembles and tastes similar to coffee, but without the caffeine.

Chicory root powder is a great source of prebiotics due to its high inulin content.

Gum Arabic Flour

Gum arabic (also known as acacia fiber) is a natural gum that comes from the acacia tree.

Gum arabic is very high in soluble fiber. It’s often found in powder fiber supplements because of this plus it doesn’t thicken so it’s easy to swallow, it has a smooth texture, and it doesn’t have an overly strong taste.

Because of its high soluble fiber content, gum arabic is a prebiotic and may help regulate blood sugar, lower cholesterol, and may even be beneficial in conditions such as diabetes and irritable bowel syndrome.

Lentils/Lentil Root Powder

Lentils have a high prebiotic carbohydrate content, so you may come across some prebiotic supplements that contain lentils or lentil extract as an ingredient.

Lentils are a good source of prebiotics, as they support “healthful hindgut microflora”. (16)


With all these different types of prebiotics, it’s important to keep in mind that you should try to get as many as you can. The reason being is that strains of probiotics tend to have certain prebiotics that they like and pair well with.

Whether you do that through foods or you get a little extra help from supplements is up to you, but getting a healthy amount of prebiotics will get you on track to having better digestive health—and that means better health overall.

Looking for a good prebiotic supplement?

It’s a good idea to take a prebiotic manufactured by the same brand as whatever probiotics you take, as they’re likely to be tailored to go together.

For example, the manufacturer of our preferred probiotic supplement, BlueBiology, has a prebiotic product specifically formulated to complement their probiotics.

In order for probiotics to flourish to their maximum potential, you need prebiotics, and this is one example where two separate products come together nicely.


Recommended Articles

Black text on a yellow background that says "lactobacillus bulgaricus" and a graphic of a bacterial cell

Lactobacillus Bulgaricus: A Probiotic Strain

Facebook Twitter Pinterest LinkedIn Email Lactobacillus bulgaricus, also known as Lactobacillus delbrueckii subsp. bulgaricus is a member of the acidophilus group of lactic acid group of bacteria and Firmicutes phylum (1,2,3). Lactobacillus delbrueckii subsp. bulgaricus is one of the subspecies

BlueBiotics Ultimate Care Review

Facebook Twitter Pinterest LinkedIn Email -EDITORS’ CHOICE-           Overall Rating:          4.8/5 What Really Sets BlueBiotics UC Apart From The Rest? For years, BlueBiotics has been the most highly recommended and most effective probiotic supplement available. With their new

The Top 5 Best Prebiotic Supplements of 2020

Facebook Twitter Pinterest LinkedIn Email Dietary fibers contain a blend of vitamins, minerals, and antioxidants that is unlike anything else we eat. For that reason, the scientific community has studied them extensively over the past few decades. The resulting list

Image of a bowl of miso soup, which can contain the probiotic lactobacillus gasseri

Lactobacillus Gasseri

Facebook Twitter Pinterest LinkedIn Email While bacteria are often associated with sickness, infection, and a host of other health issues, they are an essential part of a healthy GI system. The gut microbiome, consisting of countless bacteria found mostly in

Image of a container of the best prebiotic supplement, BlueBiology 100% Plant Based Prebiotic

BlueBiology Prebiotic Review

Facebook Twitter Pinterest LinkedIn Email BlueBiology’s BlueBiotics Ultimate Care probiotic supplement has been our preferred probiotic supplement for some time now and it’s what we recommend the most when people ask us about probiotics. So when BlueBiology came out with

Image of the top 5 best probiotics

Top 5 Probiotics of 2020

Facebook Twitter Pinterest LinkedIn Email Within the past few years, the probiotics market has been EXPLODING. Doctors may have been prescribing them for a long time, but only recently have people started including these extraordinary supplements in their daily diets.

Image of a woman holding a glass of water taking probiotic supplement bifidobacterium longum in a pill

Bifidobacterium Longum: A Probiotic Bacteria

Facebook Twitter Pinterest LinkedIn Email Bifidobacterium longum is a rod-shaped, Gram-positive, anaerboic bacterium strain in the Bifidobacterium genus of the phylum Actinobacteria (1,2). Bifidobacteria are prokaryotes, which mean that they are unicellular organisms that do not have a membrane-bound nucleus,

Image of yogurt on a table from above, which can contain lactobacillus casei

Lactobacillus Casei

Facebook Twitter Pinterest LinkedIn Email Lactobacillus casei is a rod-shaped, gram-positive, non-spore forming bacterium strain in the Lactobacilli genus (1). It is found in many strains in lactic acid fermented food products such as sauerkraut, fermented meat and fish, sourdough,

Image of yogurt, fruit and granola in a bowl on a table, which can contain the probiotic lactobacillus rhamnosus

Lactobacillus Rhamnosus

Facebook Twitter Pinterest LinkedIn Email What is Lactobacillus rhamnosus? Lactobacillus rhamnosus GG is a form of naturally occurring bacteria that is commonly found in the genital and urinary tract of human females. It is one of the most widely used

Image of two glass jars full of yogurt and fruit

Lactobacillus Salivarius

Facebook Twitter Pinterest LinkedIn Email Lactobacillus salivarius is a form of naturally occurring bacteria that is commonly found in the gastrointestinal tracts of most humans. L. salivarius is one of 25 species in the L. salivarius clade (group of organisms

Send this to a friend