Key takeaways
- Firm tofu is low FODMAP at 170 g (a generous serving) — GOS is drained away with the water during pressing.
- Silken / soft tofu is high FODMAP — it retains the GOS-rich liquid it was set in.
- Marinated or seasoned tofu packets often contain garlic or onion — check labels.
- Tofu is one of the best low-FODMAP vegan protein sources alongside tempeh.
Tofu presents a clear case where understanding food processing makes all the difference. Both firm and silken tofu start from the same soybeans — but the manufacturing steps change the FODMAP profile entirely.
FODMAP status at a glance
- —Firm tofu, 170 g: low FODMAP
- —Extra-firm tofu, 170 g: low FODMAP
- —Silken tofu: high FODMAP
- —Soft tofu: high FODMAP
- —Flavoured / marinated tofu: check ingredients
Why firmness determines FODMAP content
GOS — the oligosaccharide found in soy — is water-soluble. When firm tofu is pressed and drained, most of the GOS-containing liquid is expelled. Silken tofu is not pressed; it sets in its own liquid, retaining the GOS content. The result is two very different FODMAP profiles from the same starting ingredient.
Cooking with firm tofu
- —Cube and stir-fry in garlic-infused oil with low-FODMAP vegetables and tamari
- —Marinate in soy sauce, ginger, and sesame oil; bake until crispy
- —Crumble and season with turmeric for a scrambled egg substitute
- —Add to miso soup — but check miso brand (most are low FODMAP)
References
- 1.
