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Home » Low FODMAP Reintroduction Phase

What to expect during FODMAP challenges

Michelle, aka the irritable vegan, is a middle-aged white woman identifying as she/her. She is standing in front of a wood pallet wall, making eye contact with the camera. She is smiling over the top of a pumpkin shaped mug of mocha hot chocolate.
Modified: Jun 14, 2021 · Published: Apr 9, 2021 by Michelle @ The Irritable Vegan · This post may contain affiliate links · Leave a Comment

Knowing what to expect during your FODMAP challenges can help you to feel more prepared and in control. It's possible you'll experience everything from discovering your favourite food is not off the menu to badly timed flare-ups. Let's take a look at some of the likely outcomes and take it from there.

The good

Many people are pleasantly surprised by their ability to better tolerate FODMAPs following the elimination phase. When reintroducing FODMAPs in a controlled way we can see the true reaction that we have to each. Without the accumulated effect of stacking them all together, the portion we can tolerate becomes clearer. 

Eating FODMAPs in too large an amount is one of the main reasons for FODMAP related flare-ups. The incremental reintroductions will often show us that foods we thought we couldn't tolerate are actually ok in smaller amounts.

The bad

After bringing our symptoms down to a manageable level during the elimination phase the challenges can come as a bit of a shock. Following the guidelines for recommended test foods, portions and timings will help make things easier. However, If your elimination phase went particularly well you may have forgotten what a full-on flare-up feels like.

The timing and severity of your reactions will likely be different for each FODMAP type and can occur at any time throughout the challenge. This makes things seem a bit more unpredictable but it's actually not such a bad thing. If you react badly on day 1 of your GOS challenge you shouldn't automatically assume you'll react badly to the other challenges. If a particular challenge goes badly we can take some comfort in knowing our reaction to the next challenge may be different.

Once your symptoms settle down you need to continue to work methodically through each FODMAP challenge. This is the only way to give yourself the best possible overview of all your tolerances.

The ugly

Realistically, you need to expect that you're likely to experience FODMAP reactions that range anywhere from mild to severe. The return of some symptoms of IBS is a perfectly normal reaction to reintroducing high FODMAP foods back into the diet. [1] Bloating and gas are normal signs that the digestive system is working to process the food that we eat. Everybody farts, belches and bloats! It's only when these effects, or the expectation of them, become anxiety-inducing and physically unmanageable that they need to be addressed.

The possibility of flare-ups is an unfortunate side effect of the reintroduction process. However, it's the only way to determine which FODMAPs you can eat and in what quantities you can tolerate them. The difficulty is that these flare-ups are hard to predict and individual to each of us. 

Managing expectations

The best way to approach the reintroduction phase is to keep an open mind. Try to begin each challenge without expectations, a negative mindset or being overly sure of the results you expect.

The reintroduction challenges can be frustrating, enlightening, disappointing, surprising or downright confusing. Having a dietitian on hand during this phase is advisable. They will help you to interpret any puzzling results and reactions, keep you on track and suggest ways to make the whole thing much easier and worthwhile.

Remember that our tolerances can and do change over time. If you didn't get the results you hoped for during a particular challenge you can always return to it in the future.

Are you looking for more support during your reintroduction phase? Check out the other posts in this series.

Did anything unexpected happen during your challenges?

More Low FODMAP Reintroduction Phase

  • Reintroduction phase explained clickable link.
    Reintroduction phase explained
  • fodmap challenge foods clickable image.
    Which food should I use for my FODMAP challenges?
  • fodmap challenge portion basics clickable image.
    FODMAP challenge portions basics
  • How to space your fodmap challenges clickable link.
    How to space your FODMAP challenges

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Please be aware that these resources are for your information only. They do not replace the experience of a qualified dietitian. The Irritable Vegan is not a medical professional. As a fellow IBS sufferer, she presents biased opinions based on her experiences. We aim to simplify freely available research and information as a starting point for your unique journey. You should seek a clinical diagnosis of IBS and consult your healthcare team for personalised advice specific to your condition. Please do this before changing your diet, lifestyle or medication. The low FODMAP diet is not intended for weight loss or calorie restriction. It is a clinically approved diet for the treatment of IBS in medically diagnosed sufferers, where other first-line treatments have proved ineffective. You are not advised to undertake a low FODMAP diet without direct supervision from a FODMAP-trained dietitian. The restrictive phase of the low FODMAP diet should generally only be followed for a maximum of 6 weeks. Your personal timeframe for completing the diet will need to be tailored to meet your medical and nutritional needs. A FODMAP-trained dietitian should assess and monitor this to avoid the risk of nutritional deficiencies and disordered eating. The Irritable Vegan accepts no liabilities for any loss or damage resulting from the use of this website or information contained herein. Access to and use of this website and its information is at the risk of the user.