Overview
About Yardlong beans
Yardlong beans are botanically a cowpea, the same species as the black-eyed pea, but they are picked young and eaten as a limp half-metre pod instead of being dried into a pulse.
That harvest timing is the whole story for anyone tracking FODMAPs. Dried cowpeas grade high on total FODMAPs and galacto-oligosaccharides; the yardlong pod grades B for total FODMAPs, A for fructans and only C for GOS, which puts it much closer to a green bean than to a bowl of dal. It is clean on gluten, lactose, dairy protein, sulfites, nitrites, nightshades and lectins, and everything else that is not clean sits at a mild B: histamine, salicylate, oxalate, tyramine, nickel, free glutamate and SIBO fermentation. There is no dramatic trigger here, just a moderate legume sugar that scales with how much of the stir fry was beans.
Sensitivities
How Yardlong beans scores
Watch for
What trips people up
- Galacto-oligosaccharides grade C, the one genuinely portion-dependent thing about it. A side of long beans is mild, a plate where they are the bulk of the dish is not
- It is still a legume pod, so it is not equivalent to a common green bean, which grades clean on GOS. If you tolerate green beans but not these, that difference is the likely reason
- Restaurant preparations carry the additives, not the bean. Dry-fried long beans usually arrive with fermented black bean, preserved mustard green, oyster sauce, garlic and chilli, which bring glutamate, histamine and fructans that the pod itself does not have
- Mild across the board otherwise: histamine, salicylate, oxalate, tyramine and nickel all grade B, so it is unlikely to be your headline trigger even if it shows up on a bad day
Diet fit
Where it fits
Swap ideas
More alternatives
FAQ
Common questions about Yardlong beans
Are yardlong beans low FODMAP?
At a normal side-dish portion they are close to it. Total FODMAPs grade B, fructans grade A and polyols and excess fructose are clean, so the only fermentable fraction worth watching is galacto-oligosaccharides at C. That is a moderate, portion-dependent grade: fine as part of a stir fry, more of a gamble if the beans are the main event on the plate.
Is a yardlong bean the same as a green bean?
They look and cook alike but they are different plants. A green bean is Phaseolus vulgaris; a yardlong bean is a cowpea, Vigna unguiculata, in its long-podded form. The practical difference for a sensitive gut is small but real: the green bean grades clean on galacto-oligosaccharides while the yardlong bean carries a moderate C, which is the cowpea ancestry showing through.
Is the yardlong bean the same thing as a black-eyed pea?
Same species, opposite end of the harvest. Black-eyed peas are the mature dried seeds of the cowpea and grade high on FODMAPs and galacto-oligosaccharides. Yardlong beans are the immature pod of a long-podded cowpea variety, picked before the seeds fill out and store those sugars, which is why the pod grades so much lower than the pulse.
Why do long beans bother me at a restaurant but not at home?
Almost always the sauce rather than the bean. Sichuan dry-fried long beans are typically finished with preserved mustard greens, fermented black beans, garlic, dried chilli and often oyster or soy sauce, a stack that adds free glutamate, histamine and fructans. The pod grades B or better on all three of those, so a home version steamed or simply stir fried is a fair test of whether the bean itself is the problem.
References
Read the background
Ratings reflect the Triggerbites ingredient database and may vary with portion size and preparation.