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Fructooligosaccharides and Inulin can interact. Same-class redundancy plus additive fermentable load. Both are FODMAPs, and the functional-bowel meta-analysis found inulin-type fructans WORSENED flatulence (SMD 0.85). Choose by goal rather than stacking: inulin for glycaemic outcomes in overweight/obesity, FOS for bifidobacteria at a 10 g dose. If you combine them, start well below the sum of the two doses.
Same-class redundancy plus additive fermentable load. Both are FODMAPs, and the functional-bowel meta-analysis found inulin-type fructans WORSENED flatulence (SMD 0.85).
The same fructan family separated by degree of polymerisation: short-chain FOS runs to roughly 4-10 units and ferments fast and early, chicory inulin runs to much longer chains and ferments slowly and further down the colon. Not interchangeable — in a 200-person head-to-head at 10 g/d FOS was bifidogenic and long-chain inulin was not, a 131-person trial found inulin improved glycaemia where FOS did not, and a tolerance study allowed 10 g/d of native inulin against only 5 g/d of oligofructose.
What to do: Choose by goal rather than stacking: inulin for glycaemic outcomes in overweight/obesity, FOS for bifidobacteria at a 10 g dose. If you combine them, start well below the sum of the two doses.
This information is for educational purposes only. It is not a substitute for professional medical advice. Always consult a qualified healthcare provider before starting, stopping, or changing any supplement or medication.