Low-FODMAP Chinese & Japanese Food: What to Order & Cook

Why Japanese food is the easy one

Most cuisines build savouriness from alliums. Japanese cooking largely does not — it builds it from glutamate, extracted into dashi from kombu seaweed and dried bonito, and reinforced by fermented soy. That one structural difference removes the single biggest FODMAP problem before you start.

The core pantry is almost entirely low-FODMAP. Soy sauce is low at 2 tablespoons, because brewing degrades most of the wheat fructans and soybean GOS. Miso paste is low at 12g, which is one bowl of soup. Rice is low at any realistic portion. Rice noodles are low at 220g cooked. Ginger, rice vinegar, mirin in small amounts, sesame oil, nori and wasabi are all fine. Firm tofu is low at 170g, because pressing washes the GOS out with the whey.

Why Chinese takeaway is the hard one

The obstacle is structural rather than incidental. A commercial wok station runs on speed: aromatics go into hot oil first, the protein and vegetables follow, and a pre-mixed sauce finishes the dish in under three minutes. Those aromatics are garlic, ginger and spring onion — two of the three are fine, and the third is the most concentrated fructan source in the kitchen. Because it is added at the start of every dish from a communal tub, "no garlic please" is a request the wok station structurally cannot honour mid-service. Steamed dishes come from a different station, which is why they are the reliable ask.

Then there are the sauces, and this is where most of the surprise lives:

• Oyster sauce — usually contains garlic or onion powder, and it is in almost everything green.
• Hoisin and char siu sauce — garlic, plus a fermented soybean base and a heavy sweetener load.
• Black bean sauce — fermented black beans with garlic; the fermentation helps with GOS but the garlic does not care.
• Sweet and sour, sweet chilli, plum sauce — frequently sweetened with high-fructose corn syrup or fruit concentrate, which brings excess fructose on top of any garlic.
• XO sauce and chilli crisp — built on fried garlic and shallot. These are concentrated fructans by design.

A useful mental model: in Chinese cooking, soy sauce is the safe one and everything else in the sauce cupboard is suspect until read. The same label-reading skill that applies in a supermarket applies here — the categories are covered in our guide to reading a low-FODMAP label.

Cooking both at home: the three swaps

Everything difficult about these cuisines disappears in your own kitchen, because the problem is concentrated in three ingredients and each has a clean substitute.

Swap one: garlic becomes garlic-infused oil. This is the most important technique in low-FODMAP cooking and it is tailor-made for stir-frying. Fructans are water-soluble and do not dissolve into fat, so garlic-infused oil carries the full aroma and none of the FODMAP. Start the wok with it exactly as a restaurant would start with minced garlic. Do not make it at home and store it — commercially produced infused oil is acid-controlled, and home-infused garlic in oil carries a genuine botulism risk if kept at room temperature.

Swap two: spring onion whites become spring onion greens. The fructans in an allium concentrate in the bulb and the white base. The green tops are low-FODMAP, and Monash tests them separately for exactly this reason. Spring onion greens and chives give you the fresh allium note that otherwise goes missing. The same logic applies to leek — greens fine, white part not.

Swap three: bottled sauce becomes a four-ingredient mix. Most stir-fry sauces reduce to soy sauce, a sweetener, an acid and a thickener. Two tablespoons of soy sauce, a teaspoon of sugar or maple syrup, a tablespoon of rice vinegar and a teaspoon of cornflour slaked in water will finish almost any dish. Add grated ginger, white pepper and a little sesame oil, and you have covered the flavour range of most of the takeaway menu.

Your shopping list, graded

Five dishes to start with

• Egg fried rice. Day-old rice, egg, carrot, spring onion greens, soy sauce, white pepper, garlic-infused oil. The most forgiving low-FODMAP dish in either cuisine and a good use of leftover rice.
• Ginger and spring-onion steamed fish. A whole fish or fillet steamed with julienned ginger, finished with hot garlic-infused oil poured over spring onion greens and a splash of soy. This is a restaurant dish that is already low-FODMAP by construction.
• Miso salmon with rice. Two teaspoons of miso per portion — the tested serving — with mirin, soy and ginger, grilled onto salmon. Keep the paste near 12g per person rather than the several tablespoons most recipes call for.
• Prawn and green bean stir-fry. Prawns and green beans in garlic-infused oil with the four-ingredient sauce above and a pinch of chilli flakes.
• Chicken and rice noodle soup. Poached chicken, homemade stock with ginger and spring onion greens, rice noodles, coriander and lime. This is the fix for the pho problem: the noodles were never the issue, the onion-simmered broth was.

One myth worth retiring

If you grew up hearing that MSG causes the bloating and headache after Chinese food, the evidence has not supported that for a long time. Controlled double-blind studies have repeatedly failed to reproduce "Chinese restaurant syndrome" at dietary doses, and the FDA classifies glutamate as generally recognised as safe. Meanwhile the garlic and onion in the same meal are a well-characterised, dose-dependent fructan load with a clear mechanism. If Chinese food reliably bloats you, the alliums are the far more likely explanation — and unlike MSG, they are worth testing formally during reintroduction.

For eating out more generally, our restaurant guide covers how to ask, and the Indian and Mexican guides cover the other two cuisines people most often ask about. If you want to check a single ingredient, the IBS food checker and the FODMAP food database have the Monash portions, and the GutAI app will read a bottled sauce label from a photo.

Frequently Asked Questions