dangerous energy bar ingredient
Articles, Nutrition

The Most Dangerous Hidden Ingredient In Your Energy Bar

High-fructose corn syrup, artificial colors like red #3 and artificial sweeteners like aspartame…  There's a whole laundry list of ingredients that most health-conscious consumers know to avoid. But there's one that often flies under the radar, and it could be lurking in your so-called “healthy” energy bar.

Let's Talk About IMO

Isomalto-oligosaccharide (IMO) is a relatively sweet “prebiotic fiber” that has been popping up in more and more energy bars every day. IMO has been coming under increased scrutiny lately and for good reason.

Health or energy bars that claim to have high amounts of protein but very low levels of net or available carbohydrate, (the carbohydrate left over after dietary fiber and sugar alcohols are subtracted out) have become wildly popular in certain segments of the fitness community.

You’ve no doubt seen these so-called “high protein, low carb” bars all over the place. A key ingredient in many of these bars is IMO, which sneaky energy bar manufacturers advertise as a “prebiotic dietary fiber”. Bars made with IMO often include over 15g of IMO. This allows the bar manufacturer to deceivingly claim that their bar contains a high amount of dietary fiber.

Not knowing this, we innocent consumers see this as a win because this gives us a nutrition bar that appears to have a low level of net carbohydrate and relatively low calories with the added benefit of a prebiotic dietary fiber to go along with all that protein. But a deeper dive into the research shows that IMOs might not live up to their sterling reputation as a calorie-free, guilt-free source of dietary fiber.

The Sweeter Side of IMO

To say the average American has a sweet tooth would be an understatement.

After all, what good is a bar that's good for you when eating it is like chewing on sawdust? As consumers become increasingly well-informed though, they're ditching the bars containing nasty ingredients like sucralose and aspartame. Energy bar manufacturers, acutely aware of this problem, are scrambling to find alternatives. This is another way IMOs come in handy. 

IMO contains fewer calories per gram than natural sugar. It's high in dietary fiber and contains adequate sweetness to make an energy bar palatable. Energy bar manufacturers began using IMOs as a sweetening agent in their products, and unaware of the truth behind what they were really eating, consumers loved them. A solution to the problem of producing a bar that's portable, high in fiber and natural energy – and doesn't taste like sawdust – had seemingly been found.

But recent research has revealed some troubling aspects of IMOs and their efficacy as a truly natural source of energy. Some have gone so far as to call it the “fraudulent fiber.” 

So What's the Big Problem?

For starters, it turns out that IMO syrup isn't really “natural”, as many bar labels claim.

There is no debating that IMO occurs naturally in some foods. However, it is not economically feasible to extract IMO from foods on a large scale. Because of this, commercially-available IMO syrups are enzymatically synthesized from starch. This process converts starch into smaller chains of glucose units that are linked together via chemical bonds. So it is completely incorrect to say that the IMO syrup added to foods is natural.

Next, IMO syrup is not a completely undigestible dietary fiber, as claimed.

Studies using a digestive modeling system and human salivary or hog pancreatic alpha-amylase showed a lack of hydrolysis of IMO, suggesting that it may be a dietary fiber that would largely resist hydrolysis in the small intestine and reach the colon intact. In these studies, under resting conditions, consumption of IMO causes mean serum glucose levels to increase from 109 mg/dL pre-ingestion to a peak of 136 mg/dL at 30 minutes post-ingestion. Serum insulin also rises in parallel with glucose, reaching a peak of 32 μU/mL at 30 min post-IMO ingestion, up from 4.8 μU/mL pre-ingestion. So what’s this mean?

In a nutshell, the majority of the carbohydrate in the IMO syrup used in these bars is, in fact, digested, absorbed, and metabolized.

And, despite industry claims, IMO is definitely not calorie-free.

IMO syrup instead contains about 2.7 to 3.3 calories per gram. So, it would be dead wrong to assume that the carbohydrates from IMO don’t count as available carbohydrates to the body simply because IMO is often referred to as a dietary fiber. It is also misleading for manufacturers to list the entire carbohydrate content of IMO as dietary fiber since the studies you can read here clearly show that this is not the case.

According to this excellent, well-researched article, “IMO syrup carbs ‘don’t count' in the carb content because they are long-chain molecules. Most sugars, such as white table sugar, are short-chain molecules. Short-chain sugars burn up very quickly. They spike your blood sugar and release a flood of insulin from the pancreas. And then, if the sugars aren’t burned, they get stored as body fat.”


Perhaps you're saying to yourself, “I'll simply look at the ingredient list on my energy bar, and if don't see Isomalto-oligosaccharide or IMO, I should be safe.” Well, not quite. Does it list an ingredient called inulin? This is just another fancy word for IMO. 

When you have bars like Kion Bar that are naturally sweetened with honey and contain natural sources of fiber like almonds, chia seeds and cocoa nibs, who needs IMO anyway? To put it bluntly, IMO is not a natural fiber and not quite the low-carb friendly sweetener it's cracked up to be. So steer clear of this “fraudulent fiber”, and try your hardest to always go all-natural. It's not easy these days, but all-natural, IMO free energy bars, such as Kion Bar, are out there.

17 thoughts on “The Most Dangerous Hidden Ingredient In Your Energy Bar

  1. Victoria Miller says:

    I just had a drink powder called super cacoa and maca breakfastBowl and I mixed it with mostly water and milk. I then after a little while got this weird feeling in my mouth almost numb. then I read the back and found it had a thing called IMO. I cannot handle fake sweetener it leaves a shocking taste in my mouth. It has to be honey or sugar or nothing. I got a bit of a fright it felt like I was felt as if I was going to have a reaction to it. wont be having that again.

    1. Team Kion says:

      Always smart to listen to your body when it tell you something isn’t quite right. Good for you!

  2. L says:

    So, is Inulin good, bad, or neutral?

    1. Team Kion says:

      Inulin is another name for IMO, so the concerns related to IMO would also be relevant for inulin

  3. brucegordy says:

    I am 68 yr old diabetic who weighs 168 and have been working out hard with weights and eating over 4000 calories. My insulin is low and I haven’t been able to gain.body fat is under 6 %.would like to gain 5 pounds and get glucose level down which is running high despite metformin.Ideas diet is clean

  4. Marc says:

    I just purchased some protein powder (Organika’s Vege-Pro) that lists “organic inulin powder” as an ingredient. Is this still just IMO/inulin or something as bad?

    1. Team Kion says:

      Hi Marc, Basically, not all sources of prebiotic fiber created equal, and IMO is the one to look out for. If you check your blood glucose after you eat any bar with inulin and you don’t have a really high glycemic response, you should be fine.

  5. Alicia Ford says:

    Hi there, any thoughts on prebiotic fiber from tapioca, like the ones used in Julian BNakery’s paleo bars?

    1. Team Kion says:

      Hi Alicia, we’re not familiar with that product. Basically, not all sources of prebiotic fiber are created equal, and IMO is the one to look out for.

  6. Michael says:

    One of my energy bar lists as an ingredient “Isomalto-oligosaccharide (prebiotic fiber from cassava root)” and the other lists “soluble corn fiber (prebiotic fiber)”. Are either of these ingredients the IMO the article is talking about?

    1. Team Kion says:

      Yes, Isomalto-oligosaccharide is IMO.

  7. Kos says:

    I thought inulin was good. The article says it contains calories – is it so bad?

  8. Graham says:

    I’m always completely baffled why someone would even want to buy a commercial energy bar. A pocket full of almonds and dates, job done. If you need a bit of a boost from either carbs or fat, even better, get yourself into metabolic flexibility!

  9. Jeff says:

    What about taking psyllium husk and ground flax for fiber supplementation, do you have any experience raising of insulin levels with those ?

    1. Team Kion says:

      Hi Jeff, this is a great question for the Kion Community. Facebook.com/groups/GetKion We will keep it in mind for a future article as well. Stay tuned!

      1. Mike says:

        I’ve been curious about this as well – insulin response, does it take you out of a fasted state (I believe so?), etc.

        I find psyllium beneficial for a number of reasons, but if it’s going to negate the benefits of fasting, I’d like to know that beforehand so I can make an informed decision. Thanks!

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