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What source if most reliable for determining the fodmap in foods during the rechallenge phase?

I am rechallenging sorbitol with peaches, but also see peaches listed for fructose. Will I have an accurate rechallenge for sorbitol with peaches? The conflicting lists on various websites and in books are causing confusion during my rechallenge phase.

  1. Hi Marri! Great question! Sorbitol is a tricky one to test with as there is lots of conflicting information out there, and most fruits that contain sorbitol are also high in another FODMAP. I don't recommend peaches for testing sorbitol, because they do contain fructose. The choices I usually give my patients are - Blackberries, 6 for the first test, 12 for the second and if they pass with flying colours, I usually get them to also try Lifesavers Sugar Free Mints sweetened with sorbitol (I've found them at Walmart, they're tricky to find) - 2 candies the first test, 4 for the second test - since this is a controlled dose of sorbitol. There is a lack of consensus around how much sorbitol is found in various fruits; I believe this is due to the ripeness (the firmer the fruit the more the sorbitol) - so that's why I usually do a back-up test to confirm - especially if they think they may be sensitive and are surprised by doing so well with blackberries. Usually, I only see sorbitol intolerance in IBS-D - as the sugar alcohol is poorly absorbed and tends to pull water into the bowel - so that's something to keep in mind; the type of IBS you have may be helped or hindered by sorbitol. I hope that helps! - Andrea Hardy, RD

    1. I am suffering with IBS-D and had no symptoms with peaches. The source I was using indicated peaches as one of the best items to use for testing sorbitol. I will try your suggestions, but am really struggling with knowing which items to use for testing each of the fodmaps. What source can be trusted?

      Do I also need to test mannitol? Is it that different from sorbitol? The rechallenge phase is getting very long and tedious!

  2. Hey Marri! Great question - the reintroduction phase can be very confusing! There is no proper research to indicate the best way to retest hence why it can be challenging to find accurate information. I typically recommend seeing an RD who has developed a treatment protocol based on experience, however most RD's expert opinion is, introduce one FODMAP at a time - (that includes splitting out mannitol from sorbitol!) - using FODMAP friendly app or Monash app can help guide you in this, or a registered dietitian or physician specialized in FODMAP's to guide you, as it can be individual, and based on practitioner preference. Hope that helps! - Andrea Hardy, RD

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