Overview
About Water spinach
Water spinach is not spinach and that distinction is the whole point of this page.
Ong choy or kangkong is Ipomoea aquatica, a hollow-stemmed aquatic vine in the morning glory family, while true spinach belongs to an entirely different plant family and is graded high for oxalate, salicylate and free glutamate. Water spinach is graded moderate for oxalate, and moderate rather than high across histamine, tyramine, salicylate, nickel and glutamate as well, with no single spike anywhere. It is clean on gluten, lactose, sulfites, nitrites and nightshades. If you cut spinach for oxalate reasons and assumed kangkong was off the table too, the data does not support that assumption.
Sensitivities
How Water spinach scores
Watch for
What trips people up
- Do not read spinach grades across to this plant. True spinach carries top-band oxalate, salicylate and glutamate grades; water spinach sits a full band lower on all three despite the shared name
- The profile is a broad moderate rather than a spike. Histamine, tyramine, salicylate, oxalate, nickel and free glutamate all land in the middle. Individually none of them is alarming, but a large plate of stir-fried greens stacks several mild triggers in one sitting
- Moderate nickel, which is worth logging if you have systemic nickel allergy. Leafy greens are a category nickel-sensitive eaters usually treat carefully, and a fast-growing aquatic crop is no exception
- FODMAP data is unrated. Monash has not published a tested portion for water spinach, so treat "kangkong is low FODMAP" claims as unverified rather than confirmed
- The garlic, shrimp paste, fermented bean curd and oyster sauce that ong choy is nearly always cooked with are much bigger triggers than the leaf. Fructans from the garlic and histamine plus glutamate from the fermented pastes usually explain a reaction better than the green does
Diet fit
Where it fits
Swap ideas
More alternatives
FAQ
Common questions about Water spinach
Is water spinach the same as spinach?
No, and they are not even close botanically. Water spinach is Ipomoea aquatica, a morning glory relative that grows as a hollow-stemmed vine in water. Spinach is Spinacia oleracea, an unrelated plant. The English name comes from the cooked texture, not from any shared chemistry, which is why their trigger grades differ so sharply.
Is water spinach high in oxalate?
It is graded moderate, not high. That places it well below true spinach, which is one of the highest-oxalate foods commonly eaten. If you are managing calcium oxalate kidney stones, water spinach is a middle-of-the-road green rather than one to eliminate, and boiling and discarding the water lowers soluble oxalate in leafy greens generally.
Is kangkong low FODMAP?
There is no tested answer. The FODMAP fields for water spinach are unrated because Monash has not published portion data for it, so the honest position is unknown rather than safe. If you are in the elimination phase, introduce it as its own test food and cook it plainly without garlic so the result means something.
Why is water spinach hard to buy in parts of the United States?
Because it is a federal noxious weed. USDA APHIS listed Ipomoea aquatica in the aquatic section of the Federal Noxious Weed List, so importing it or moving it between states requires a permit. It spreads aggressively in warm freshwater and can blanket ponds and waterways. Several states regulate cultivation separately, which is why availability varies so much by region.
References
Read the background
Ratings reflect the Triggerbites ingredient database and may vary with portion size and preparation.