Are Cruciferous Vegetables Low Fodmap?

Low Fodmap for Life


One of the most common questions I get asked on the low fodmap diet is about cruciferous vegetables. This is such a confusing topic for most people starting off on the low fodmap diet simply because there is so much conflicting information available on the internet. I have been following this diet for 3 years now and I thought this is a great topic to write about so that I can share with you an outline of what has been researched and what is, as yet, undetermined.

Firstly, to answer the question: are cruciferous vegetables low fodmap?

Well, YES and NO.

Cruciferous vegetables have a long tradition and reputation for being regarded as vegetables that may cause gas and discomfort, but it is good news for us IBS sufferers that not all cruciferous vegetables are off-limits.

This is my list below, although it isn’t conclusive.:

  • Arugula or Rocket – low fodmap *
  • Bok Choy – should be OK up to 1 cup. Large servings (2 cups) contain high amounts of Polyol (sorbitol), so limit the servings size if this is a problem for you *
  • Broccoli – should be OK up to 1/2 cup. Large servings (1 cup) contain high amounts of Oligos (fructans, GOS) and Polyol (sorbitol) so watch your serving size *
  • Brussels sprouts – should be OK up to 2 sprouts. Avoid large servings (6 sprouts) which contain high amounts of Oligos (fructans) and moderate amounts of Polyol – sorbitol *
  • Cauliflower – No! Even small servings have high amounts of Polyols (mannitol) * (Read about my personal experience with cauliflower here)
  • Choy sum – low fodmap *
  • Collard greens – unsure. They are closely related to kale (which is safe) so they may also be safe. Best to avoid initially and then re-introduce and monitor your symptoms.
  • Chinese broccoli (gai-lan or kai-lan) – unsure. Best to avoid initially and then re-introduce and monitor your symptoms.
  • Common cabbage – should be OK in servings up to 1 cup. Larger servings contain high amounts of Polyol (sorbitol). Best to limit your servings if you know sorbitol is a problem. * (I personally find that I don’t tolerate cabbage very well)
  • Savoy cabbage – in servings up to 1/2 cup are OK for most people with IBS. Servings of 1 cup contain high amounts of Oligos (fructans) *
  • Daikon – unsure. I suspect it is probably low fodmap. Best to avoid initially and re-introduce to monitor your symptoms.
  • Horseradish – unsure.  Best to avoid initially and re-introduce to monitor your symptoms.
  • Kale – in servings up to 1 cup is low in fodmaps! * So go ahead and enjoy it! (I love it sauted in butter or coconut oil, either plain or as the main ingredient in scrambled eggs)
  • Kohlrabi – unsure. Best to avoid initially and then re-introduce and monitor your symptoms.
  • Radish – low fodmap. *
  • Rutabaga or Swede – I believe this has been tested in the USA as low in fodmaps but I am unsure of the safe servings sizes. ª
  • Wasabi – unsure. As it is generally eaten in such small amounts I suspect that it would be OK.
  • Watercress – unsure. I suspect that it is low in fodmaps.

I hope this helps guide you on making low fodmap choices.  While the diet does restrict a lot of these vegetables there is still a good variety to choose from especially if you watch your serving sizes.

Feel free to get in touch if you have any questions!




*  Monash University Low Fodmap App

ª K. Scarlatta at

3 thoughts on “Are Cruciferous Vegetables Low Fodmap?

  1. Watercress sits in the middle of foods. It has a Fructose count of .5 g per 100g, Sucrose is .2 per 100 (no sorbitol) . Which makes it better than Brussels spouts .8 Fru per 100, .16 SORB and 1.11 SUCR.

    Daikon is .6 Fruct and .14 SUCR (0 Sorb)

    Horseradish is .1 fru and 7 grams of Sucrose per 100G (no sorb)

    Kale is is low in fructose and sucrose but it contains a lot of indigestible oligosaccharides, can lead to symptos like IBS

    This site seems to suggest no:

    Click to access Nutrition-guide-for-fructose-malabsorption.pdf


    • Thanks for your comment.

      One of the reasons I wrote this post is to address the conflict over kale and broccoli. I personally support the research that comes out of Monash University as I find that it is a highly accurate predictor of how I will tolerate a food, however if you are in doubt, I would encourage everyone to conduct their own dietary challenges to determine an amount that is suitable for them. I personally eat kale and broccoli (in small serves) and tolerate them well.

      Looking at the others vegetables, fructose malabsorption, according to Sue Shepherd, is problematic when fructose is in excess of sucrose, so watercress may be an issue for fructose intolerance depending on quantities consumed. Brussell sprouts could be an issue with sorbitol intolerance, however the research from Monash suggests that small serves should be OK for most people with IBS.

      Daikon and Horseradish look to be OK!

      Liked by 1 person

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