Turnip
Vegetables · Root Vegetables
The cheapest root in the shop is also one of the safest. Turnip records just 0.04 g of fructans at half a cup cubed, 55 g, and nothing at all from the other five groups, so it roasts and mashes without a portion to watch. It is the quiet substitute when the sweeter roots start counting against you.
Last updated 4 September 2026Serving sizes for turnip
Half a cup cubed (55 g) is rated green, and it is the only serve tested.
Tested serving sizes
| Serving | Amount | Main FODMAP | Rating |
|---|---|---|---|
| 1/2 cup cubed | 55 g | Fructans 0.04 g |
Breakdown for 0.5 cups
Is turnip low FODMAP?
One group, in a trace: 0.04 g of fructans in half a cup cubed, well under the 0.1 g at which fructans start counting, with the other five groups at zero. Roots vary more than the box they share suggests. Celeriac also carries mannitol, 0.12 g at its green serve, and turns amber at a full cup; parsnip is the near twin, green at the same half cup cubed on 0.05 g of fructans. Only one turnip portion has been measured, so half a cup is the amount the rating covers.
Turnip and IBS: what to know
Mash is where a root vegetable stops being a portion. Half a cup each of two or three roots is a normal plate, but the same vegetables boiled, mashed and served with a ladle become an amount nobody is tracking, and butter or cream usually arrives in the bowl with them. The cooking liquid is the other thing worth a look, because stews, gravies and anything built on a stock cube bring fructans of their own. Fructans dissolve in water, so a cube’s worth spreads through the entire pot rather than staying where you dropped it.
Gut-friendly ways to eat turnip
Turnip roasts far better than it boils. Cut it into wedges, toss them in oil and roast hard until the edges caramelise and the peppery bite mellows into something sweeter. Boiled and mashed on its own it holds water and turns bland, which is why it is best cut half and half with potato or parsnip. Small turnips are sweeter and finer-grained than the big woody ones, so buy them around the size of a golf ball where you have the choice. Grated raw, it also gives a slaw a horseradish-ish edge.
Frequently asked questions
How much turnip can I eat on a low FODMAP diet?
Half a cup cubed, about 55 g, is the tested serve and it is rated green. That is a side-dish amount rather than a taste, and nothing larger has been measured, so a big bowl of turnip sits outside what the data can vouch for. Turnip is usually one of several vegetables on a plate anyway, which makes the total across the meal the more useful thing to watch.
Is turnip mash low FODMAP?
The turnip in it is, at half a cup. What makes mash risky is that it hides quantity and rarely arrives plain: cream and butter bring lactose and fat, gravy and stock cubes bring fructans, and roasted garlic is a common addition. Mash it with potato and loosen the bowl with lactose-free milk, or with the cooking water and olive oil, and the dish stays where the rating puts it.
Are turnip and swede the same vegetable?
No, and it matters, because they sit next to each other in the shop. A turnip is the small white root with a purple shoulder and white flesh; swede, sold as rutabaga or neeps in some places, is bigger, yellow-fleshed and noticeably sweeter. The figures on this page cover turnip only, so do not read them across to a pot of swede mash however alike the two look once cooked.
Can I use turnip instead of potato?
Often, though for flavour rather than for FODMAP reasons, since potato is rated green at a whole medium potato and is not a food you need to replace. Turnip is sharper, wetter and holds its shape less obligingly, so it suits a stew or a roasting tray better than a tray of chips. Use it where you want a lighter, more peppery root under a piece of meat or fish.
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