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Fiber One Bars Review

Healthy Snack or Fake Food? (Nutritionist Reacts)

Portable, bite-sized cereal bars have become a staple as we navigate our busy modern-day lives. They are perfect for satisfying many nutritional needs and cravings while on the go.

Unfortunately, many of them have some negative side effects, raising the question: is the Fiber One bar a healthy snack or a fake food?

I consider Fiber One bars a healthy snack option thanks to their high dietary fiber content, but only when consumed in moderation.

Otherwise, when you have too many of these bars, you may experience bloating, cramping, or gassiness due to their high fiber content (at least 6 g of dietary fiber per 23 g bar). 6 g might not sound like a lot, but since these are only 70 calories per bar it would be really easy to overdo it.

Most of these side effects are temporary and only prevalent if you don’t generally have enough fiber in your diet.

Additionally, Fiber One Chewy Bars are loaded with added sugars and artificial ingredients with no nutritional value.

So let’s break down the Fiber One bars to find out whether they are worth your cash.

What Are Fiber One Bars?

Fiber One bars are manufactured by General Mills. These fiber bars make a suitable snack or low-calorie breakfast option as they’re a good protein source with a low-calorie count and are high in dietary fiber.

Other than bars, General Mills also produces a variety of other high-fiber products, including cereals, bread, sweet treats, and bites. The main thing to frown upon with Fiber One products is the high amount of artificial sweeteners they contain.

These also have very little to offer in terms of vitamins and minerals.

Fiber One makes three main types of bars:

  • Fiber One (70 calories) Chewy Bars
  • Fiber One (70 calories) Brownies or Soft Baked Bars
  • Fiber One Chewy Protein Bars
70 calories chewy chocolate barsChewy Bars Chocolate 70 calories natural flavor chocolate brownies with chocolate chipsBrownies Chocolate Fudge coconut almond protein chewy barsCoconut Almond

Fiber is an essential dietary requirement that only 5% of American adults get enough of.

Fiber One bars are a tasty and convenient way to increase your fiber intake. According to General Mills, these bars contribute 21–26% of the average adult’s recommended daily fiber target.

Adequate fiber intake is linked to a healthy gastrointestinal system and also helps to reduce cholesterol levels and regulate blood sugar levels.

“I have a row of various Fiber One products on my shelf so grabbing a treat or dessert is delightful…”

C. Schwartz

Nutritional Macros

Fiber One bars contain 70 calories per each 23 or 25 g bar and 130 calories per 33 g bar. The macronutrients contributing to this calorie intake include:

  • 5 g Net carbs
  • 1–2 g Sugar
  • 2–6 g Protein
  • 1–3.5 g Saturated fat
  • 90–130 mg Sodium

The Fiber One Chewy Bars and Brownies do not contain any cholesterol, vitamin D, or potassium, while the Chewy Bars contain less than 5 mg of cholesterol.

Pros and Cons of Fiber One Chewy Bars and Brownies

Fiber One Bar
Fiber One Chewy Bars and Brownies Review
The Takeaway
We’d like to bring the reality closer to home. Here’s a table that highlights the pros and cons of Fiber One bars.
Taste and Texture Rating:
Macros Rating:
Plant Protein or Fiber Content Rating:
Ingredients Rating:
Value Rating:
Sugar Rating:
Have an adequate soluble and insoluble fiber content
Offer consumers a diverse variety of flavors
Inulin obtained from chicory root fiber improves gut health
Boasts a low calorie count
Some of the Fiber One Bars have a relatively high sugar content packed in a few calories
Contain milk soy and eggs making them unsuitable for people on vegan diets
Eating too many can cause you digestive system issue due to their high fiber content

Rating of the Fiber One Chewy Bars and Brownies

The section below breaks down the bars’ ratings based on six criteria to help determine whether the Fiber One bars are really a healthy snack or if they’re a fake food.

Texture and Taste

NuGo Bar

My favorite thing about Fiber One bars has always been the variety of flavors they offer. My favorites include:

  • Chocolate Chip Cookie Brownies
  • Chocolate Fudge Brownies
  • Chocolate Caramel & Pretzel Chewy Bars
  • Coconut Almond Protein Chewy Bars
  • Chocolate Peanut Butter Chewy Bars

The new 70 calorie bars have lost when it comes to taste. The former 90 calorie bar and brownie formula was tender and soft, but this new formula is dry and has a chemical after taste.


Fiber One bars contain carbs, calories, and protein from some healthy ingredients.

  • 2–6 g Fat
  • 16–17 g Total carbohydrates
  • 6–8 g Dietary fiber
  • 2–6 g Protein

The fat in the bars is obtained from highly refined palm and canola oil, which are prone to oxidation and may lead to inflammation.

Additionally, some of the carb content is derived from high-carb sweeteners, like fructose corn syrup, maltodextrin, and sugar. These sugars are associated with a blood sugar level spike and increases one’s risk of diabetes.

Plant Protein and Fiber Content

Whey protein concentrate, soy lecithin, milk, and eggs are among the sources of protein used in Fiber One bars. These ingredients make the bars unsuitable for vegans, and soy may weaken estrogenic and anti-estrogenic activity in the body.

The main sources of fiber in the Fiber One bars are:

  • Chicory root
  • Bran
  • Whole grain oats

Inulin fiber from chicory root and oat fiber are soluble, meaning they are broken down during digestion. Bran fiber, however, is insoluble and typically supports the digestion of other foods.

Additionally, the inulin promotes the growth of beneficial bacteria and improves gut health, which can help you with your weight loss goals.


Fiber One Chewy Bars and Brownies contain a mixture of the following ingredients:

  • Chicory root extract
  • Rolled oats
  • Nonfat milk or milk powder
  • Soy lecithin
  • Crisp rice or rice flour
  • Sugar, honey, and cellulose gum
  • Salt
  • Whole grain barley flakes and barley malt extract
  • Vegetable glycerin
  • Sugar cane fiber
  • Canola oil
  • Palm kernel oil
  • Baking soda

Several flavors are used to distinguish the different varieties. These include:

  • Caramel
  • Semisweet chocolate (sugar, chocolate liquor, chocolate chips cocoa butter, natural flavor)
  • Peanut butter

There’s nothing too grand about these ingredients. Even worse, there are multiple fake sugar alternatives and other artificial additives.


These bars are fairly priced for a healthy snack bar that’s ideal for breakfast, dessert, or an on-the-go treat. You can get this bar for even less if you sign up for Fiber One’s Subscribe & Save program for the best bulk discounts.

Low Sugar

Fiber One bars can’t be considered low-sugar. That’s because they contain at least 5 g (20 calories) of sugar, despite their variation in macronutrients.

The sugar comes from natural sweeteners like sugarcane fiber, but the bars also contain a lot of added sugars from corn syrup, maltodextrin, honey, and cellulose gum.

“Excessive sugar alcohols are the problem causing bitter aftertaste and digestive eruptions..”

Claxon,Bill — United States

Still not sure? Check out these reviews of other fiber rich bars we tested:

Fiber One Bars vs. Human Food Bar

When compared to the Fiber One bar, the Human Food Bar is not your typical fiber bar.

It contains a unique blend of ingredients, including prebiotic fibers, resistant starch, plant-based protein, and superfoods.

the human food bar

This unique blend provides you with a tasty fiber bar that’s lectin-free, plant-based, and that provides you with multiple health benefits.

This table gives you a side-by-side comparison of the Fiber One and Human Food Bar.

  Fiber One Bar Human Food Bar
Dietary fiber content 6–9 g dietary fiber from chicory root, bran, and oats 8 g dietary fiber obtained from multiple fiber sources (prebiotic fiber and resistant starch)
Carb and sugar content Contains at least 5 g of sugar from added sugars Low carb and low sugar without sugar alcohols
Superfoods None Four superfoods: baobab, green banana flour, tiger nuts, and cacao
Calories 70–140 calories 200 calories (just enough to keep you full)

The Fiber One bar is worth taking a bite of. But, it lacks some beneficial ingredients, such as superfoods, to be your go-to fiber bar.

Our Human Food Bar, on the other hand, will provide you with all the benefits of a fiber bar and keep you satisfied for a long time. What’s more, our bar will be so healthy that you can eat it everyday without developing any stomach-related issues, like you would if you had too many Fiber One bars.

Not to toot our own horn, but the Human Food Bar is a definite winner.

Paleo friendly

Is the Fiber One Bar Worth Your Money?

We can all agree that the Fiber One bar has quite a bit to offer as a healthy snack, but it doesn’t quite make the grade. This is owing to its extremely high fiber content, excess sugar, and inadequacy when it comes to superfoods and health-boosting ingredients.

The Human Food Bar, however, compensates for these deficits and more, making it the ideal fiber bar to help you meet your daily dietary requirements.

Our bar is inspired by ancient humans but designed for modern humans to ensure you have impeccable gut health without compromising on taste.

By joining our waitlist, you can be among the first few people to get your hands on this impeccable bar.

Still not sure? Check out these reviews of other fiber rich bars we tested:

Frequently Asked Questions

Are there any allergens to be aware of in the Fiber One bars?

Yes. Fiber One bars contain common allergens such as soy, milk, and wheat ingredients.

Are Fiber One bars an adequate source of dietary fiber?

Generally, these bars are not the enemy, and they do make a good dietary fiber supplement. However, I cannot recommend them over other fiber sources.

Are Fiber One bars lectin-free?

No, Fiber One bars are not lectin-free. Most flavors contain lots of ingredients with lectins, such as peanuts and almonds, and also contain sugar alcohols. Furthermore, these bars have a low Amazon rating and are partially processed with genetic engineering to retain freshness.

Remy is the founder of Human Food Bar. A health and wellness enthusiast based in Berkeley, California with a deep interest in dietary nutrition, he's well versed in the Plant Paradox, Keto, Paleo and Vegan diets. He has a borderline obsession with nutrition bars that eventually gave birth to the Human Food Bar. In his free time he likes to blog, cook, mixologize, garden and mountain bike.
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Registered Dietitian Nutritionist, Nutritional Synergy
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Kathy is a Registered Dietitian Nutritionist with a Master of Science degree from Michigan State University in Human Nutrition. She's been a Registered Dietitian for 32 years serving in all capacities of my profession from clinical nutrition to public health and education. She's passionate about helping people change their lives for the better using medical nutrition therapy and in the art and practice of writing about all aspects of functional and integrative nutrition.
Remy is the founder of Human Food Bar. A health and wellness enthusiast based in Berkeley, California with a deep interest in dietary nutrition, he's well versed in the Plant Paradox, Keto, Paleo and Vegan diets. He has a borderline obsession with nutrition bars that eventually gave birth to the Human Food Bar. In his free time he likes to blog, cook, mixologize, garden and mountain bike.
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