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  • Last updated: 29 July 2025
  • Est. reading time: 3 minutes
  • All About Sorbitol and Mannitol

  • Sorbitol and mannitol are types of sugar alcohols, also known as polyols. They are naturally found in a range of fruit and vegetables, and can also be added to diet versions of food and drinks. Some of us have intolerances to sorbitol and mannitol, here’s everything you need to know…

  • Est. reading time: 3 minutes
  • All About Sorbitol and Mannitol

  • Sorbitol and mannitol are types of sugar alcohols, also known as polyols. They are naturally found in a range of fruit and vegetables, and can also be added to diet versions of food and drinks. Some of us have intolerances to sorbitol and mannitol, here’s everything you need to know…

What are sorbitol and mannitol?

Sorbitol and mannitol are types of “sugar alcohols”, also known as polyols. They are naturally found in a range of fruit and vegetables, and can also be added to diet versions of food and drinks.

 

How are they digested?

Polyols (sorbitol and mannitol) are poorly digested by many people. These sugars are partly absorbed into the blood by passive diffusion in the small intestine. A person’s transit time (how long food stays in the digestive tract) and the molecular size of the sugar will influence how much is absorbed.

Due to their very small size, these sugars have the ability to draw water into the small intestine (this also can happen with undigested fructose and lactose), resulting in watery diarrhea. After that, undigested sorbitol or mannitol will finally reach the large intestine, where the gut microbes will start to break them down into gases (like hydrogen) and other beneficial fermentation products (like Short Chain Fatty Acids – SCFAs).

 

What are the common symptoms associated with poor digestion of polyols?

Even small doses of sugar alcohols can result in diarrhea, bloating, and increased flatulence, in particular in people with IBS. It is important to identify your unique tolerance, as this can vary considerably from person to person.

 

Can I test this myself?

If you suspect that you have an issue with sorbitol or mannitol, you can use breath testing to measure your intolerance. You can find out more about the FoodMarble breath analysis device and app here.

We also have a “FoodMarble Program“, which you can use with the breath analysis device to find which foods suit you best. You will test your tolerance to 4 hard-to-digest food components (FODMAPs); lactose, fructose, sorbitol, and inulin. You’ll get guided through the whole process using the app.

 

Sorbitol and Mannitol in Food

Examples of vegetables containing sorbitol

  • Aubergine – 75g is low FODMAP
  • Green beans – 75g is low FODMAP
  • Bok choy – 75g is low FODMAP
  • Sweet corn – 75g is high FODMAP


Examples of vegetables containing mannitol

  • Butternut squash – 75g contains moderate FODMAPs
  • Cauliflower – 75g is high FODMAP
  • Celeriac – 75g is low FODMAP
  • Celery – 75g is high FODMAP
  • Fennel, bulb – 75g contains moderate FODMAPs
  • Leek, leaves – 75g contains moderate FODMAPs
  • Button mushrooms – 75g is high FODMAP
  • Snow peas – 75g is high FODMAP


Examples of fruits containing sorbitol

  • Apple (fresh) – 160g (one apple) is high FODMAP
  • Apricot – 70g (two apricots) is high FODMAP
  • Avocado – 80g (half an avocado) is high FODMAP
  • Blackberries – 160g is high FODMAP
  • Coconut – 95g contains moderate FODMAPs
  • Nectarine – 150g is high FODMAP
  • Peach (contains both sorbitol and mannitol) – 145g is high FODMAP
  • Plum – 65g is high FODMAP


Examples of fruits containing mannitol

  • Peach (contains both sorbitol and mannitol) – 145g is high FODMAP
  • Watermelon (mannitol) – 150g is high FODMAP

 

Frequently Asked Questions
about Sorbitol and Mannitol

Sorbitol and mannitol are sugar alcohols (polyols) naturally found in fruits and vegetables, and often added to sugar-free products. They’re poorly absorbed by many people, which can lead to digestive symptoms.

Because these polyols are only partially absorbed in the small intestine, they draw water in and reach the large intestine where gut bacteria ferment them. This can cause diarrhea, bloating, and gas, especially in people with IBS.

Taking breath tests with FoodMarble AIRE 2 can help you detect intolerance. By measuring hydrogen and methane after consuming a small amount of these polyols, you’ll see how your gut reacts, so you can pinpoint what causes symptoms.

Yes, individual tolerance varies. Factors like digestion speed and polyol amount affect how much you absorb. It’s important to find your personal limit for each polyol to avoid symptoms without unnecessarily restricting healthy foods.

With FoodMarble AIRE 2 and the Food Intolerance testing kit, you can test sorbitol with one of our sachets, and foods with mannitol individually. Real-time breath tracking shows your fermentation response, helping you gradually introduce polyols and build a varied, symptom-free diet tailored to your tolerance.

Would you like to test your food sensitivities?

FoodMarbles FODMAP Testing Kit is a great way to find the foods that are right for your body.  If you are looking to find the root cause of your digestive issues check out our AIRE device and FODMAP Testing Kit.

Claire Shortt

PhD Microbiologist

  • 6 January 2024
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