Overview
About Fava beans
Fava beans carry a genuine safety warning that most foods do not: in people with G6PD deficiency, the most common enzyme deficiency worldwide, eating fava beans can trigger favism, an acute breakdown of red blood cells (hemolytic anemia).
The beans contain vicine and convicine, compounds that create oxidative stress the G6PD-deficient body cannot buffer. On top of that, fava beans are one of the highest-FODMAP legumes, topping the scale for galacto-oligosaccharides (GOS), and are high in nickel.
Sensitivities
How Fava beans scores
Watch for
What trips people up
- Favism risk: in G6PD deficiency, the vicine and convicine in fava beans can trigger hemolytic anemia, with jaundice, dark or cola-coloured urine, fatigue and shortness of breath appearing 1 to 3 days after eating them. This is a medical emergency, not an intolerance
- Highest galacto-oligosaccharides (GOS) rating and top-of-scale total FODMAPs, so fava beans bloat a sensitive gut even in small portions
- High in nickel, relevant for systemic nickel allergy
- High in lectins, so they must be cooked thoroughly
Diet fit
Where it fits
Swap ideas
More alternatives
FAQ
Common questions about Fava beans
Why are fava beans dangerous for people with G6PD deficiency?
Fava beans contain vicine and convicine, which the gut converts into oxidants (divicine and isouramil). People with G6PD deficiency cannot protect their red blood cells from this oxidative stress, so the cells break apart, a reaction called favism. It causes hemolytic anemia with jaundice, dark urine and fatigue, usually 1 to 3 days after eating, and can be severe, especially in children. Anyone with known G6PD deficiency should avoid fava beans entirely.
Are fava beans low FODMAP?
No. Fava beans are one of the highest-FODMAP legumes, topping the scale for galacto-oligosaccharides (GOS) and total FODMAPs, so they readily cause bloating and wind in IBS. Quinoa, rice and edamame are much lower-FODMAP protein and carb swaps, and none of them carry the favism risk.
References
Read the background
Ratings reflect the Triggerbites ingredient database and may vary with portion size and preparation.