Rhubarb is low FODMAP. Monash University, the leading authority on FODMAP testing, gives rhubarb a green light at a standard serving size of about one cup (roughly 130 grams) of chopped stalks. This makes it one of the more generous low FODMAP options, since many fruits and vegetables only qualify at much smaller portions.
Why Rhubarb Works on a Low FODMAP Diet
Rhubarb stalks are naturally low in the fermentable sugars that trigger symptoms in people with IBS. They contain minimal fructose and virtually no fructans, galactans, or polyols, which are the sugar types most likely to cause bloating, gas, and abdominal pain. Because rhubarb is tart rather than sweet, it simply doesn’t carry much sugar of any kind.
That tartness is actually a useful signal. Fruits high in fructose tend to taste sweeter, while rhubarb’s sharp, sour flavor reflects its low sugar content. This is also why rhubarb almost always needs a sweetener when you cook with it, which is where FODMAP-conscious eaters need to pay attention.
Watch What You Add, Not the Rhubarb Itself
Plain rhubarb is safe, but rhubarb rarely shows up plain. Crumbles, pies, compotes, and stewed rhubarb typically rely on sweeteners and other ingredients that can push a dish into high FODMAP territory. Honey is high in fructose and a common IBS trigger. Agave syrup is similarly problematic. Apple juice concentrate, often used in “naturally sweetened” recipes, is high FODMAP as well.
Safer sweetening options include regular white sugar, brown sugar, or maple syrup, all of which are low FODMAP in typical amounts. Monash University’s own stewed rhubarb recipe uses about 55 grams (a quarter cup) of brown sugar. If you prefer less sugar, a pinch of stevia or a squeeze of orange juice can take the edge off rhubarb’s sourness without adding fermentable sugars.
Pairing rhubarb with strawberries is a classic combination that works well on a low FODMAP diet, since strawberries are also rated green at reasonable serving sizes. The strawberry-rhubarb pairing reduces how much sweetener you need overall. Avoid combining rhubarb with apple, pear, mango, or watermelon, as these fruits are high in fructose or polyols.
The Laxative Effect Worth Knowing About
Rhubarb contains natural compounds called anthraquinones that stimulate bowel movement. These compounds work in two ways: some act directly on the intestinal lining to increase fluid secretion, while others influence the nervous system to speed up the movement of food through your gut. This is why rhubarb has been used as a traditional remedy for constipation for centuries.
For people with IBS who lean toward constipation, this mild laxative effect can actually be helpful. But if you have diarrhea-predominant IBS, large servings of rhubarb could worsen symptoms even though the FODMAP content is low. FODMAPs aren’t the only thing that affects your gut. Start with a smaller portion if you’re unsure how your body responds, and increase from there.
Only the Stalks Are Edible
This is worth stating clearly: only eat rhubarb stalks. The leaves contain oxalic acid at concentrations high enough to be toxic. Rhubarb leaf poisoning can cause serious symptoms including difficulty breathing, kidney problems, and seizures. The stalks also contain some oxalic acid, but at much lower levels that are safe for normal consumption. If you grow rhubarb at home, trim and discard the leaves before bringing stalks into the kitchen.
How to Use Rhubarb on an Elimination Diet
During the elimination phase of a low FODMAP diet, rhubarb fits comfortably into your meal plan. One cup of chopped stalks per sitting keeps you well within the tested safe range. You can stew it with ginger and a tablespoon or two of sugar for a simple dessert or breakfast topping. Fresh ginger is also low FODMAP and helps settle the stomach, making it a natural partner.
Rhubarb also freezes well. Chop raw stalks into chunks, spread them on a baking sheet to freeze individually, then transfer to a bag. This lets you pull out exactly the amount you need without defrosting a whole batch. Frozen rhubarb works just as well as fresh in cooked dishes, and the FODMAP content doesn’t change with freezing.
For baking, rhubarb pairs well with oat-based crumble toppings using gluten-free oats, butter, and a low FODMAP flour like rice flour or spelt flour. Keep thickeners simple: cornstarch and tapioca starch are both FODMAP-free. Avoid wheat flour in large quantities if you’re also managing gluten sensitivity, though small amounts of wheat are technically low FODMAP.