Soybean Oil

Why soybean oil is rated low

Soybean oil is low FODMAP, and it stays low at any typical portion. The rating is estimated from what the oil is made of rather than from a weighed, measured serving, and what it is made of is refined fat with essentially no carbohydrate left in it. FODMAPs are water-soluble rather than fat-soluble, so they stay behind in the bean solids during pressing and refining instead of travelling into the oil. That is why the single rung on the ladder, Any typical portion, comes in low, and why there is no subgroup recorded against this food at all. The reassurance is real, but it belongs to the oil specifically and does not extend to the bean it came from or to a bottle that has had other things added to it.

What changes your risk

• What gets added to the bottle Plain soybean oil is the low FODMAP item. A flavoured or seasoned oil with onion or garlic pieces sitting in it is a different product, because solid pieces left in the oil bring their water-soluble FODMAPs along with them. Garlic-infused oil is the exception that works, since the flavour dissolves into the oil while those FODMAPs do not, as long as no solids remain.
• What the oil is cooking Oil is rarely the whole dish. A stir fry, a marinade or a dressing built on soybean oil takes its rating from the onion, garlic, stock powder, soy-based sauce or spice blend that goes in with it, not from the fat.
• The whole meal's total load Because this oil carries no subgroup of its own, the thing to watch is everything else on the plate. Several low FODMAP servings in one sitting still add up to a moderate or high total, so a generously oiled meal can go wrong through its other ingredients while the oil itself stays fine.
• The bean is not the oil Whole soy beans, edamame and soy flour are a different food with a different rating, and being comfortable with soybean oil says nothing about them. Firm tofu is a reliable low FODMAP protein, while soy milk made from whole beans is not interchangeable with it.

What else works

There is no need to replace soybean oil, since it does the neutral everyday cooking job at any typical portion. If you want variety, olive oil, canola oil, rice bran oil, peanut oil and sunflower oil all fill the same role, and garlic-infused oil covers the savoury depth that a garlic clove would otherwise provide. The lookalikes worth separating out are the soy foods that are not simply refined fat: whole soy beans, edamame, soy flour and soy milk made from the whole bean are not the same thing as the oil. Chives, the green tops of spring onions, leek leaves and a pinch of asafoetida are the seasonings to pair it with rather than onion, shallot or garlic cloves.

How to keep it low

Buy plain refined soybean oil rather than a flavoured blend, and read the ingredients on anything described as a cooking oil blend, a stir fry oil or a seasoned oil, since those often carry onion or garlic solids. If you make your own garlic-infused oil, warm the cloves in the oil to draw out the flavour and then strain every piece out before storing it, because it is the solids left sitting in the bottle that cause trouble. Keep the bottle away from the stovetop and out of direct light so it does not go rancid, and use a spoon or a pour spout rather than a free hand when dressing a salad, not because the oil climbs in FODMAPs but because a heavily oiled meal is harder on many people with IBS for reasons that have nothing to do with FODMAPs. When you eat out, the oil in the pan is almost never the issue, so ask instead about the onion, garlic and stock in the sauce.

Common questions

is soybean oil low fodmap

Yes. Soybean oil is low FODMAP at Any typical portion, because it is refined fat and FODMAPs are water-soluble rather than fat-soluble, so they stay in the bean solids instead of the oil.

can i use soybean oil on the elimination phase

Plain soybean oil is fine to cook with during elimination at Any typical portion. What matters is the rest of the pan, so watch for onion, garlic, stock powder and seasoning blends going in alongside it.

if soybean oil is low fodmap are soy beans too

No, they are separate foods. The oil is refined fat with essentially no carbohydrate left, while whole soy beans, edamame and soy flour are legume foods with their own rating, so being fine with the oil tells you nothing about them.

is garlic infused soybean oil ok

Yes, as long as no solid garlic is left in it. Garlic flavour dissolves into oil while its FODMAPs, which are water-soluble, do not, so a properly strained infused oil gives you the taste without them.