The patient complains of onion or garlic ‘allergy.’ She explains she has a threshold of how much she can eat before she gets brain fog and mucus production as well as GI discomfort. Can this solely be attributed to SIBO, or should I look elsewhere?

Chris Kresser: Next question from Daniela, “The patient complains of onion or garlic ‘allergy.’ She explains she has a threshold of how much she can eat before she gets brain fog and mucus production as well as GI discomfort. Can this solely be attributed to SIBO, or should I look elsewhere?”

I would say SIBO is the most likely candidate for intolerance of fructans and onions and garlic.