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FoodMarble Health For use by physicians
  • Last updated: 19 April 2022
  • Est. reading time: 5 minutes
  • FoodMarble AIRE Sorbitol Test

  • Why and how to test your tolerance to Sorbitol with our FODMAP Testing Kit…


  • Est. reading time: 5 minutes
  • FoodMarble AIRE Sorbitol Test

  • Why and how to test your tolerance to Sorbitol with our FODMAP Testing Kit…


What is sorbitol?

Sorbitol is a type of sugar alcohol (or polyol), which is commonly found in a range of fruits and vegetables. It can also be found in toothpaste, mouthwash, chewing gum, soft drinks (used as a low-calorie sweetener), and in low-calorie and diabetic food products as a sweetener.


What is sorbitol intolerance or sensitivity?

It is quite common to have an issue digesting large amounts of sorbitol in one sitting. It is poorly tolerated by many, especially those with a sensitive gut, like people with IBS. Sorbitol is quite a small sugar so it is digested by passive diffusion, through the walls of the small intestine. In large quantities, it can cause osmotic diarrhea (watery diarrhea). The undigested portion will move along to the large intestine, where it is broken down by our gut microbes. There can be a rapid build-up of gas, resulting in abdominal pain, bloating and excess flatulence.


What can doing the Sorbitol Challenge with my FoodMarble AIRE tell me?

By performing a sorbitol breath test, you will be able to get an understanding of how well your body can tolerate and digest sorbitol. A big factor is how long the sorbitol remains in your small intestine (your transit time), as this will dictate how much is passively absorbed through the small intestinal wall.

We have taken a selection of results from our users who have already performed a Sorbitol Challenge. We selected three different results for interpretation. Each user consumed 10g of sorbitol, which is approximately equal to the amount of sorbitol present in a medium-sized pear.

PLEASE NOTE: FODMAP Challenges are tested in a fasting state, which reduces the chance of experiencing uncomfortable symptoms. However, if you were to eat or drink something containing sorbitol after a meal containing a large amount of fermentable foods, that could result in symptoms, as the combination could result in an excessive amount of gas production. Since the effect of what you eat and drink is cumulative, it’s important to log your meals and take multiple breath readings over the day to see the combined effect of your meals.


Sorbitol Test Result, Low Fermentation Score


The final result for this challenge was 0/10. The user didn’t experience any uncomfortable symptoms during or after the challenge, so it is likely that their body is able to tolerate 10g of sorbitol quite well.

It’s possible the user fully absorbed the portion of sorbitol as there was no measurable level of hydrogen on their breath during the testing period. Alternatively, the hydrogen produced from the fermentation of the undigested sorbitol may have been consumed by other resident microbes in the gut. Hydrogen is an important by-product and can be used to make other products that are beneficial for the body.


Sorbitol Test Result, Medium Fermentation Score


The final result for this test was 3.8/10. You can see from the graph that there was a peak in hydrogen production at 1 hour 45 minutes, and remained at a similar level up until the second last reading, where it has started to drop.

This particular user has IBS and found they had a number of loose stools during the testing period. They also found that they became bloated towards the end of the test, which changed to abdominal pain later that day. For some people, certain symptoms appear after the peak in breath hydrogen.

The level of hydrogen produced was at a medium level, but considering they have a sensitive gut and had a clear osmotic response to this dose of sorbitol, we would recommend that they consider reducing the level of sorbitol in their diet, in order to avoid uncomfortable digestive symptoms.


Sorbitol Test Result, High Fermentation Score


The final result for this challenge was 8.4/10. This user experienced quite a significant level of hydrogen production during the testing period. This strongly indicates that the portion of sorbitol (10g, similar level to a pear), was not absorbed well.

This user felt some minor flatulence and increased bloating, but did not experience any other digestive symptoms. They said that they measured their breath 1 and 2 hours after the testing period and their fermentation levels had already returned to baseline. This would suggest that they have a good ability to expel excess hydrogen, either by breath, flatulence, or consumption by other gut microbes present in their colon.

We recommend this user be aware that their body doesn’t absorb sorbitol well and to be mindful when meal planning. This user was in a fasted state, meaning their digestive tract was fairly empty of gas and foodstuff, so they were less likely to experience symptoms during a challenge. There is still a potential for generating symptoms on a regular day if sorbitol was consumed in conjunction with a meal containing a mix of FODMAPs.

Are you struggling with food sensitivities?

Would you like to fast-track your road to digestive health and comfort with the use of the FoodMarble AIRE and FODMAP Testing Kit?  If are struggling to find your foods why not check out how FoodMarble can help you and your gut.

Claire Shortt

PhD Microbiologist

  • 6 August 2021
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