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Inulin Fiber and Prebiotics Foods for Healthy Gut Flora

Inulin fiber for probiotics. Yes, it's true. Eating foods with inulin combined with resistant starch is the best at promoting healthy gut flora.
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Inulin Fiber and Prebiotics Foods for Healthy Gut Flora

Inulin foods contain what are known as super-complex carbohydrates. Insulin fiber in addition to serving as a food additive substitute for sugar promotes healthy gut flora, the ultimate prebiotic. Prebiotic foods with insulin including bananas, corn, and garlic are low gi making it easier to control blood sugar. A diet with inulin may lower cholesterol and is said to aid in the absorption of calcium. For best results combine with resistant starch foods.

What is inulin?

Inulin is a polysaccharide that despite being used as a substitute for sugar is in fact a fiber belonging to the dietary fiber fructans. For this reason it is sometimes referred to as sugar fiber. Fuctan fiber known as fructo-oligosachcharides (FOS) contains long carbohydrate molecules (complex carbs) used by some plants as a mode of energy storage. Inulin complex carb passes through your digestive system not metabolized until reaching your colon.

Inulin fiber

Inulin like other fibers is not absorbed during digestion but instead pass through your digestive tract otherwise known as the gastrointestinal system intact unabsorbed. Inulin fiber is said to promote healthy gut flora said to probiotic effect on the body.

Natural sources of inulin soluble fiber

Inulin fiber derived from inulin sources such as foods with inulin like root chicory and other natural sources of inulin like, onions, leeks, and garlic. That fact that it has a low glycemic index makes it advantageous to take for people looking to control blood sugar levels.

Side effects of too much inulin

Fiber in inulin foods can be found added to processed foods like chocolate bars and other snack foods can backfire in your diet causing unwanted stomach aches. Eating too much inulin fiber in your diet may come with side effects. That is why although many benefits come along with eating foods with inulin, you should only do so in moderation.

Inulin fiber vs psyllium fiber

Inulin and psyllium are both sources of water-soluble dietary fiber. However, unlike inulin that has a gassy effect on the body, psyllium lies quite while absorbing water softening your stool. In addition psyllium isn't accompanied with side effects of overuse such as intestinal bacterial overgrowth. On the other hand, there have been reports of allergic reactions to fiber enriched cereal with psyllium. The same goes for inulin.

Inulin supplements for extra soluble fiber

Inulin supplements serves as a psyllium-free solution to supplementing your diet with extra fiber in addition to feeding the good bacteria in you digestive system.

List of foods containing inulin

Foods with inulin such as chicory root, onions, bananas, corn, and garlic gives your health benefiting inulin fiber without having to resort to supplements that tend to be costly in the long term.  However, depending on the natural source of inulin fiber you chose to consume, the inulin content may differ. Due to the gassy nature of foods containing inulin increased consumption of inulin foods may lead to more gas.

Chicory root

Chicory root fiber is one of the best sources of inulin. With 15-20 grams of inulin per 100g serving size the only inulin foods that come close are the Jerusalem artichoke and asparagus.
Commercial sources of chicory root fiber inulin include chicory root powder and chicory root extract.
Chicory root is an exemplary food containing inulin.


The inulin content in onions being between 2 and 6 grams per 100g serving size may not seem like much at first. The phytochemical content (quercetin and anthocyanins), eating onions gives you both inulin and polyphenols for antiaging.


Asparagus along with chicory root and the Jerusalem artichoke is one of the best natural sources of inulin fiber available. Based on the assumption that asparagus contains only 5% less inulin than chicory root, the inulin content of asparagus is between 13 and 18 grams per 100g serving size. Asparagus is also packed with antiaging polyphenols that may slow down the effect of aging.

Jerusalem artichoke

The Jerusalem artichoke is one of the top 3 foods high in inulin fiber alongside chicory root and asparagus. It is a tuber (potatoes-like vegetable) weighing between 75 and 200g dry. In addition to being a good source of other valuable nutrients, the Jerusalem artichoke is considerably high in potassium. It is said to have 14 to 19 grams of inulin per 100 gram serving size.


Garlic has between 9 and 16 grams of inulin per 100 gram serving size. In addition to being as good source of inulin fiber, it is considered to have strong natural antibiotic properties.

Benefits of inulin rich foods

The benefits of insulin rich foods in your diet included less energy consumption in calories, easier way to control blood sugar, healthy gut flora for probiotics, lower cholesterol reducing the risk of heart disease, and increased calcium absorption in your colon.

Less energy

Inulin contains only a fraction of the energy found in sugars and fat. That means less energy intake to worry about when dieting.
There are only 1.5 calories per gram of inulin. Compared to sugar (4Cal/g) and fat (9Cal/g), inulin calories are relatively low calorie.
Due to the fact that inulin contains significantly less energy than sugar and fat, its use in health food is on the rise.

Control blood sugar

Due to the fact that inulin is not broken down until it reaches the colon, it has little to no effect on your insulin levels making it super low-gi along with one of the best ways to control blood sugar whether you are diabetic or not.

Healthy gut flora

Inulin promotes healthy probiotic gut flora making it a prebiotic acting as food for intestinal bacteria. Intake of inulin not exceeding the recommended daily intake improves the efficiency of your digestive system.

Lower cholesterol

Along with helping to lower neutral fats such as triglycerides, inulin may help lower cholesterol. The fat reducing effect of inulin has been demonstrated on hamsters. Hamsters fed dietary inulin showed significant loss in cholesterol. However, for humans the effect of inulin is not certainly proven to lower cholesterol.

Increase calcium absorption

Inulin type fructans are said to increase calcium absorption if consumed regularly. A study on young adults concluded that prebiotic inulin has a positive effect on the nutrient absorption of dietary calcium in the colon due to the probiotic effect it has on the body. Results indicate as much as a 3% increase in calcium absorption in young adults with increased inulin consumption.

ABRAMS, Steven A., et al. An inulin-type fructans enhances calcium absorption primarily via an effect on colonic absorption in humans. The Journal of nutrition,2007, 137.10: 2208-2212.

Bottom line on inulin in foods

Inulin combined with resistant starch is rumored as the super prebiotic. Recent studies suggest that the combination of inulin fiber and resistant starches, resistant starch with inulin produces a synergetic effect said to the leading edge in remedies to promote a healthy gut. However, one side effect to be wary of is the consuming too much inulin. Overconsumption of inulin may cause stomach problems due the overgrowth of gut flora that feed on inulin in the body.

By Martin Nicholson

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