The doctor said symptoms often appeared two to four hours after granola or high-fibre cereal with chicory root, and roughly two-thirds of IBS-D patients improved within a week after removing fortified breakfasts.
The report says inulin, oligofructose and chicory root fibre can ferment rapidly, especially when combined with sugar alcohols and gums, causing bloating, cramping and urgency in sensitive guts.
Some clinicians warn against blaming one ingredient because prebiotics can benefit many people, while specialists argue dose, timing and individual tolerance matter and call for clearer fibre labelling.
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