Oh my friends, this is hands down one of the most frequently asked questions we get when people are starting the low FODMAP diet. So if you’ve been wondering are the low FODMAP serving sizes for foods per meal or per day, then we’ve got you covered.
First off let’s look at why serving sizes are important then we can chat about serving sizes in your meals.
Why are serving sizes important?
Most foods, apart from oils and proteins, will contain some level of FODMAPs – this is because FODMAPs are carbohydrates that naturally occur in fruit, vegetables, grains, legumes, dairy and processed products.
Laboratory testing is used to determine if a food contains low, moderate or high levels of FODMAPs. Often we find that a food can have different FODMAP ratings at different serving sizes.
For example, according to Monash University, sweet potato is low FODMAP at a ½ cup serving, moderate FODMAP in a ⅔ cup serving and high FODMAP at a ¾ cup serving.
The above example shows that the larger the serving size of the food the more FODMAPs are present. This means that understanding portion sizes is an important part of the low FODMAP diet.
So, does that mean low FODMAP serving sizes for food are per meal or per day?
While you are in the first phase of the low FODMAP diet, your goal is to focus on eating low FODMAP serving sizes and foods to see if this helps you improve your gut symptoms.
The low FODMAP serving sizes are per meal. This means you can eat the same food again after a to 3–4 hour time period (2). Leaving a few hours between each serving spreads out the FODMAP load from that food and will help keep your tummy happy.
For example, you could have a ½ cup serving of rolled oats for breakfast and then 3-4 hours later have a serving of 2 oat-based cookies for afternoon tea – this would still be low FODMAP.
If you want to increase the serving size of a food, make sure you check the serving size notes in the Monash University FODMAP Diet App first. This way you can avoid moderate and high FODMAP serving sizes until you’ve identified your personal FODMAP tolerance levels.
Can I combine multiple foods with low FODMAP servings sizes in a meal?
Yes, the low FODMAP serving size recommendations have been developed so you can combine multiple low FODMAP serving sizes for different foods in one meal (1). We recommend that you try not to overthink your food combinations – many people find that just focusing on eating low FODMAP foods is enough to settle symptoms.
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Where do I find serving size information for low FODMAP foods?
The best place to find serving size information for high and low FODMAP foods is in the Monash University FODMAP Diet App. This app has been developed by the lead researchers of the low FODMAP diet and has the most up-to-date and extensive lists of high and low FODMAP foods. Also, the small one off payment you make to purchase the app helps to support low FODMAP and IBS research.
You can learn more about the Monash University FODMAP Diet App here (FYI this isn’t an affiliate link, we just love their app).
We also have lots of helpful FODMAP handouts available in our FODMAP Made Easy program where you can also access FODMAP courses, dietitian-led classes, low FODMAP meal plans and more.
Final Thoughts
During the first phase of the low FODMAP diet focus on eating low FODMAP serving sizes and foods. Just remember that low FODMAP serving sizes for foods are per meal and not per day. This means you can repeat the same food later in the day after a 3 to 4 hour break.
References:
- Monash University. Monash University Low FODMAP Diet App. 2021-Feb-17. Sourced from: https://www.monashfodmap.com/ibs-central/i-have-ibs/get-the-app/
- Dwyer, L, McNamara & J. Varney. How to avoid FODMAP Stacking. Monash FODMAP Blog. 2019-04-17. Sourced from: https://www.monashfodmap.com/blog/how-avoid-fodmap-stacking/
Image credit: Alana Scott – A Little Bit Yummy
Hi Alana, thank you so much for this blog. I have been dairy free for several years and I have been trying the low FODMAP diet, as recommended by my doctor, now for 4 weeks, and still having symptoms. I’m wondering if it’s the amount of almond I’m consuming. Most of my dairy free products are almond based. Almond milk, almond yogurt, almonds in my granola, etc. As you are also dairy free, how much almond product can I consume and still be low FODMAP? Thanks!
Hi Crystal,
Thanks for reaching out! Yes, I was dairy free for 5 years so I know the struggles that go with being dairy free. I’ve recently been able to bring low FODMAP dairy back into my diet which is exciting. There are a few things we would recommend you do to help improve your symptoms – check your yoghurt, granola, and other processed products for sneaky high FODMAP ingredients that could be causing issues. Check the Monash University FODMAP Diet App for information on serving sizes for almond based foods. Then leave 4 hours between having a low FODMAP serving of almonds in your granola and then having almonds again as a snack or in a trail mix. Almonds by themselves are much higher in FODMAPs and need good portion control compared to almond milk. We hope that helps!
Thank you!
This knowledge makes meal planning a lot easier. Thanks!
You are very welcome. It’s awesome to hear you found the article useful.
Thank you for this article. Straight to the point and very clear. Exactly what I was looking for and makes planning a lot easier!
Hi Sam,
You are very welcome. It’s lovely to hear that our resources are making things easier for you.