Orange
Fruits · Citrus
A whole medium orange, about 130 g, is rated green. That matters more than it sounds: most fruit in this guide earns its green rating at a wedge, a handful or a third of the fruit, while an orange is measured as the thing you actually peel and eat. Fructans are the only FODMAP group present, at 0.05 g.
Last updated 3 September 2026Serving sizes for orange
One medium orange, about 130 g, is rated green. It is the only tested point in our data.
Tested serving sizes
| Serving | Amount | Main FODMAP | Rating |
|---|---|---|---|
| 1 medium orange | 130 g | Fructans 0.05 g |
Breakdown for 1 orange
Is orange low FODMAP?
Oranges read clean. At one medium fruit, excess fructose, sorbitol, mannitol, lactose and GOS all measure zero, and fructans sit at 0.05 g, half the 0.1 g point where a portion starts to rate moderate. Compare that with apple, which stays green only up to a 20 g wedge because fructose and sorbitol climb together. Citrus lacks the polyols that make stone fruit awkward, and orange has no fructose left over once its glucose is counted.
Orange and IBS: what to know
Orange juice is a separate entry in this guide for a reason. A glass takes the flesh of two or three oranges, arrives without the fibre that slows it down, and goes down in a minute rather than over the time it takes to peel and eat one. Whole fruit paces you. Our figures cover one medium orange and stop there, so treat that as your reference portion rather than proof that a bag of them behaves the same way. Pith and segments are fine; nothing in the data separates them.
Gut-friendly ways to eat orange
Orange earns its place as the low-effort fruit: one in a bag, one in a lunchbox, segments through a salad with fennel and olives. The zest carries flavour into dressings and marinades where you would otherwise reach for something high in fructans. For variety in the same slot, mandarins peel faster for small hands, and kiwifruit holds a green rating at two fruit, so a bowl can mix both without much arithmetic. Marmalade has its own entry, since sugar and peel change the sums.
Frequently asked questions
How many oranges can I eat in a day with IBS?
Our data covers one medium orange, about 130 g, and that serve is rated green. It is a single tested point, not a ceiling that has been checked and cleared, so two oranges in a sitting is genuinely unmeasured rather than known to be fine. Use one as your reference portion, and if you want more fruit across the day, take it from a different green-rated fruit.
Is orange juice low FODMAP?
Orange juice is a separate entry with its own rating, so check it rather than assuming the whole fruit answers for it. The difference is concentration: a glass holds the flesh of several oranges without the fibre, and it is drunk far faster than a piece of fruit is eaten. A small glass alongside a meal is the sensible form.
Which citrus fruit is lowest FODMAP?
Lemon reads cleanest of all: at half a lemon, 30 g, every one of the six FODMAP groups measures zero. You are unlikely to eat lemon by the fruit, though, so for something to peel and eat, orange and mandarin are the practical choices, with grapefruit and lime holding their own entries in the guide.
Can orange still cause IBS symptoms if it is low FODMAP?
It can, because a green rating only says the FODMAP load at that portion is low. Citrus is acidic, and if reflux travels with your IBS, sharp fruit on an empty stomach can bite for reasons that have nothing to do with fermentation. Volume counts too: three oranges in an afternoon is a lot of fruit and a lot of fibre, whatever the rating says.
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