Is Onions Safe for SIBO?
Onions are extremely high in fructans and are one of the top two trigger foods for SIBO (along with garlic). All types — white, red, yellow, shallots, spring onion bulbs — contain high levels of fermentable oligosaccharides. Even small amounts cooked into sauces or soups can trigger symptoms.
Safe Portion Size
None
Recommended maximum per serving for SIBO patients
FODMAP Level
high
Based on Monash University FODMAP research
Rating by SIBO Type
Important Notes
The green tops of spring onions (scallions) are low-FODMAP and safe to use for an onion-like flavor. Avoid the white bulb portion. Leek greens are another safe alternative.
SIBO-Safe Alternatives to Onions
- Green part of spring onions/scallions only
- Chives
- Leek leaves (green part only)
Frequently Asked Questions
Is onions safe for SIBO?
Onions is rated avoid for SIBO. Onions are extremely high in fructans and are one of the top two trigger foods for SIBO (along with garlic). All types — white, red, yellow, shallots, spring onion bulbs — contain high levels of fermentable oligosaccharides. Even small amounts cooked into sauces or soups can trigger symptoms.
How much onions can you eat with SIBO?
The recommended safe portion is None. The green tops of spring onions (scallions) are low-FODMAP and safe to use for an onion-like flavor. Avoid the white bulb portion. Leek greens are another safe alternative.
What can I eat instead of onions with SIBO?
SIBO-safe alternatives include: Green part of spring onions/scallions only, Chives, Leek leaves (green part only). These are generally better tolerated and less likely to trigger SIBO symptoms.
This information is for educational purposes only and is not a substitute for professional medical or dietary advice. Food tolerances vary between individuals. Consult a healthcare provider or registered dietitian for personalized guidance.