Are Walnuts High In Fodmaps

Walnuts are high in FODMAPs, but only in larger servings, which is why they’re often listed as a moderate FODMAP food rather than a strict high one.
 
If you’ve been asking are walnuts high in FODMAPs because you’re following a low FODMAP diet, the short answer is that they contain certain fermentable carbs that can trigger symptoms in sensitive people.
 
The good news is that small portions of walnuts are usually well tolerated, so you don’t have to cut them out completely.
 
In this post, we’ll look at why walnuts are high in FODMAPs in bigger amounts, how many you can safely eat, and what to watch out for.
 
Let’s get into it.
 

Are Walnuts High in FODMAPs?

Walnuts are high in FODMAPs when you eat them in larger quantities, and here’s why.
 

1. Walnuts Contain Fructans and GOS

The main reason walnuts are high in FODMAPs comes down to two carbohydrate groups: fructans and galacto-oligosaccharides, also known as GOS.
 
These are fermentable carbs that your small intestine doesn’t fully absorb.
 
Instead, they travel down to your large intestine where gut bacteria ferment them.
 
For people with irritable bowel syndrome or FODMAP sensitivity, that fermentation can cause bloating, gas, and discomfort.
 
That’s exactly why walnuts are high in FODMAPs for some eaters and not others.
 

2. Serving Size Changes Everything

Here’s the part most people miss: whether walnuts are high in FODMAPs depends entirely on how many you eat.
 
Monash University, the leading researcher on FODMAPs, lists walnuts as low FODMAP in small servings.
 
A serving of about 10 walnut halves, or roughly 30 grams, is considered low FODMAP.
 
Once you go beyond that, walnuts become high in FODMAPs because the fructan and GOS content stacks up.
 
So the question isn’t really are walnuts high in FODMAPs at all, it’s are walnuts high in FODMAPs at the amount you’re eating.
 

3. Your Gut Bacteria Play a Role

Not everyone reacts the same way to walnuts.
 
That’s because the bacteria in your gut determine how much gas gets produced when fermentable carbs break down.
 
Someone with a balanced, tolerant gut may eat a handful of walnuts and feel fine.
 
Someone with IBS or a sensitive digestive system might find that walnuts are high in FODMAPs enough to set off symptoms.
 
This is why personal tolerance matters when you’re deciding how walnuts fit into your low FODMAP diet.
 

How Many Walnuts Can You Eat on a Low FODMAP Diet?

So how many walnuts can you actually eat before they become high in FODMAPs?
 
Here’s a simple guide to keep walnuts from causing trouble.
 

1. Stick to About 10 Halves Per Sitting

Around 10 walnut halves, or 30 grams, is the sweet spot where walnuts are not high in FODMAPs.
 
That amount gives you a nice dose of healthy fats, protein, and omega-3s without overloading your gut.
 
If you want walnuts as a snack, portion them out instead of eating straight from the bag.
 
That one habit alone keeps walnuts from being high in FODMAPs for most people.
 

2. Spread Them Across the Day

If you love walnuts, you don’t have to eat them all at once.
 
Sprinkle a few on your oatmeal, add some to a salad, and enjoy a small handful later.
 
This keeps each serving small, so walnuts stay low in FODMAPs overall.
 
Stacking large portions in one meal is what pushes walnuts into high FODMAP territory.
 

3. Watch Out for Other High FODMAP Foods

Sometimes walnuts get blamed when the real culprit is what you ate with them.
 
Pair walnuts with high FODMAP fruits like apples, pears, or dried fruit, and your gut load adds up fast.
 
Instead, combine walnuts with low FODMAP options like strawberries, blueberries, or a plain yogurt alternative.
 
That way, walnuts won’t be high in FODMAPs, and neither will your snack.
 

Are Walnuts High in FODMAPs Compared to Other Nuts?

It helps to see how walnuts stack up against other nuts if you’re managing FODMAPs.
 

1. Walnuts vs. Almonds

Almonds are high in FODMAPs at just 10 nuts, making them trickier than walnuts.
 
Walnuts are high in FODMAPs only past a larger serving, so they’re often the friendlier choice.
 
If you’re choosing between the two, walnuts typically win for low FODMAP eaters.
 

2. Walnuts vs. Cashews

Cashews are notorious for being high in FODMAPs even in tiny amounts.
 
Walnuts are high in FODMAPs at a much higher threshold, which makes them easier to enjoy.
 
So if cashews upset your stomach, walnuts may still work for you.
 

3. Walnuts vs. Pecans

Pecans are low FODMAP in small servings, similar to walnuts.
 
Both pecans and walnuts are high in FODMAPs only when you overdo the portion.
 
So walnuts hold their own nicely against other low FODMAP nuts.
 

So, Are Walnuts High in FODMAPs?

Walnuts are high in FODMAPs in larger servings, but low FODMAP in small ones, so portion size is the real answer.
 
If you stick to around 10 halves at a time, walnuts usually won’t trigger FODMAP symptoms.
 
But eat a big bowlful, and yes, walnuts can be high in FODMAPs enough to cause bloating and gas.
 
The key is knowing your own tolerance and keeping servings modest.
 
Hope this post has helped you understand whether walnuts are high in FODMAPs and how to enjoy them without the discomfort.