Are Fiber One Bars Good For You?

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There are several types of Fiber One bars:

  • Chewy Bars (35% of daily value fiber or 9 grams of fiber per serving)
  • Protein Chewy Bars (20% of daily value fiber and 6 grams of protein per serving)
  • Trail Mix Chewy Bars (35% of daily value fiber or 9 grams of fiber per serving)
  • 90 Calorie Chewy Bars (20% of daily value fiber or 5 grams of fiber per serving)
  • Meal Bar (9 grams of fiber & 10 grams of protein per serving)

What are the Pros and Cons of Fiber One bars?


1. Most Fiber One bars list chicory root extract as the first ingredient.  Chicory root is a rich source of soluble fiber known as inulin. It is added to food products to boost their fiber content and improve taste or texture.

Inulin is a prebiotic that promotes the growth of specific beneficial gut bacteria. It is not digested in the small intestines but is fermented by beneficial bacteria in the colon. Hence, chicory root extract or inulin can help relieve constipation, protects against gastrointestinal diseases and improves overall health.

2. Low in sugar

Cons: 1. Fiber One  bars contain too many ingredients including artificial additives such as caramel colour, glycerin, tricalcium phosphate, dipotassium phosphate, artificial flavour/colour, etc.

The “Oats and Strawberries” flavoured Chewy Bars contain “natural strawberry flavored fruit pieces” (sugar, cranberries, citric acid, natural flavor, elderberry juice concentrate, sunflower oil, soy lecithin). See what I mean by too many ingredients? Why aren’t the bars made with real strawberry fruit instead?

As stated on the packaging, Fiber One bars are either naturally flavored or naturally and artificially flavored. It seems that these bars may be unpalatable if no natural and/or artificial flavours are added to them.

2. Due to the fermentation of inulin (chicory root extract) in the colon, excess consumption of Fiber One bars may cause gastrointestinal side effects such gas, bloating, flatulence, cramps or diarrhea in some people.

2. GMO ingredients There are no indications that the soluble corn fiber, soy fiber, soy protein or soybean oil used in the bars are non-GMO.

3. Soy Protein &  Soy Protein Isolate Fiber One Protein bars and Meal bars contain soy protein and/or soy protein isolate, which are highly processed and a cheap source of protein. There are also potential safety concerns on increased consumption of soy products as discussed here.


While the high fiber content of Fiber One bars is great for satisfying cravings and increasing fiber intake, it may cause gastrointestinal discomfort in some people. Chicory root extract (inulin) does not have the taste and texture of normal fiber foods, thus it is easy to over consume it. So, don’t try to eat too many bars at one time or in a day.

Fiber One bars are a let down due to the long list of ingredients and artificial additives. There are other granola or protein bars that have better nutritional profiles than Fiber One bars.

Check them out:
3 Healthy Granola Bars
3 Healthy Protein Bars

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