Supplements
inulin-type fructans decreases body weight
In plain terms: Does chicory-root fibre help you lose weight?
Contested Supplements 🔬 Includes disconfirming
Part of: 🧪 inulin-type fructans
RefutedContestedStrong support
consensus score -0.15
Unclear. An industry-funded analysis and one trial found small weight losses, but three other trials at similar doses found none, so any effect is small and not reliably repeated.
📅 Last reviewed: 2026-07-15 ⓘ
Evidence ladder
How far up the ladder this claim has climbed. A high consensus on a low rung means "consistent so far," not "proven in people."
Top evidence so far: All trials, pooled (Meta-analysis)
MechanismIn-vitroAnimalObservationalRCTMeta-analysis
How the studies fall
2 support 3 contradict 3 tested null 2 mixed · 10 sources, 5 independent groups
What the evidence shows
Contested. An industry-funded meta-analysis (reimer-2024, BENEO) reports small significant reductions in weight, BMI and fat mass, and one 12-week trial of 21 g/d oligofructose (PMID 19386741) reduced body weight in overweight adults.
The evidence (13)
| Source | Grade | Stance | Quality | Finding |
|---|---|---|---|---|
| Pol K, de Graaf C, Meyer D, Mars M 2018 · Br J Nutr | RCT | contradicts | moderate | Pol 2018 12-wk triple-blind RCT, 55 overweight/obese adults, snack bars with 2 x 8 g oligofructose/d vs equienergetic control bar: 'energy intake, body weight and fat mass remained similar in the Co-Bar and OF-Bar groups (all P>0·05)'. Null in the claim's population and dose range = contradicts; small and short, no interval in abstract. Hunger ratings modestly lower (P=0·04). Sensus (inulin producer) co-author. [abstract-grade] |
| Pan LH, Yao ZW, Hu WF, Jia HT, Ren WL, Wang PP, Ling SP, Zhu H 2025 · Frontiers in nutrition | meta-analysis | tested-null | low | Yacon-root MA (ITF/FOS-rich WHOLE FOOD, not purified chicory inulin): BMI SMD -0.81; body weight direction-only. Authors flag low study quality. Off-form + low-certainty support. |
| Pokushalov E, Ponomarenko A, Garcia C, Pak I, Shrainer E, Seryakova M, Johnson M, Miller R 2024 · Nutrients | RCT | mixed | moderate | Fiber blend incl inulin produced 4.9% weight loss vs placebo over 180d (combo, partial attribution) |
| Reimer RA, Theis S, Zanzer YC 2024 · Am J Clin Nutr | meta-analysis | supports | moderate | Small significant reductions in weight/BMI/fat mass; BENEO (manufacturer) funding flag ⚠️ correction-on-file (Crossref) - kept, corrigendum not retraction |
| Liber A, Szajewska H 2013 · Ann Nutr Metab | meta-analysis | mixed | moderate | SR of inulin-type fructans on appetite/energy-intake/body weight; limited data suggest long-term ITF may contribute to modest weight reduction |
| Hume MP, Nicolucci AC, Reimer RA 2017 · Am J Clin Nutr | RCT | tested-null | moderate | Double-blind RCT (NCT02125955), 42 children 7-12 y with BMI >=85th percentile, 8 g/d oligofructose-enriched inulin vs maltodextrin for 16 wk. Weight endpoint is BMI z score: 'In intent-to-treat analysis, there was a trend for prebiotic supplementation to reduce BMI z score to a greater extent than placebo (-3.4%; P = 0.09) and a significant -3.8% reduction in per-protocol analysis (P = 0.043).' Underpowered trend toward the claim on ITT -> tested-null (§5). Primary aim was appetite: buffet energy intake fell only in 11-12-y-olds (P = 0.04), not 7-10-y-olds. |
| Reshef N, Gophna U, Reshef L, Konikoff F, Gabay G, Zornitzki T, Knobler H, Maor Y 2024 · Nutrients | RCT | tested-null | low | Double-blind pilot RCT, NAFLD + metabolic syndrome (BMI ~32.5), 16 g/d inulin/oligofructose 75/25 (n=8) vs maltodextrin (n=11) x 12 wk. Weight was held constant by design: 'Participants were instructed to follow a weight-maintenance diet provided by a registered dietician'. Median weight prebiotic 94.1 -> 93.9 kg (p=0.1), placebo 94.4 -> 91.5 kg (p=0.5); 'Body weight remained stable in both groups.' Because the protocol clamped energy intake and weight, the weight null is neutral to whether ITF reduce weight in free-living overweight adults (the satiety route the claim relies on was blocked by design). FGF-19 and LBP did NOT change (earlier extract said 'altered'). Pilot, 'limited statistical power'. |
| Pugh JE, Petropoulou K, Vasconcelos JC, Anjum A, Thom G, McCombie L, Tashkova M, Alshehhi S, Babalis D, Holroyd L, Sadiq BA, Prechtl C, Preston T, Chambers E, Lean MJ, Dhillo W, Prevost AT, Morrison D, Frost G 2024 · EClinicalMedicine | RCT | tested-null | moderate | iPREVENT RCT, 270 overweight adults 20-40 y, 10 g/d inulin-propionate ester (IPE) vs 10 g/d inulin control for 12 months: 'no significant difference in baseline-adjusted mean weight gain for IPE compared with control (1.02 kg, 95% CI: -0.37 to 2.41; p = 0.15; n = 226)'. Inulin was the control in both arms, so this tests propionate on top of inulin, not inulin itself; the control arm's unadjusted +0.07 kg gain has no non-inulin comparator. |
| Li J, Liu F, Luo Y, Wijeyesekera A, Wang S, Chen X, Lv Y, Jin J, Sheng H, Wang G, Wei Y, Li Z, Chen M, Zhou H 2025 · BMC Med | RCT | contradicts | moderate | 4-wk double-blind RCT (ChiCTR-IOR-17010574, n=131; 15 g/d inulin vs 15 g/d FOS vs maltodextrin; OW inulin arm n=13). Clean null on weight: 'After a 4-week intervention, there were no significant effects of these prebiotics on weight, BMI, UA, lipid profile (TC, TG, HDLC, LDLC), and hs-CRP'; OW inulin weight 75.5 +/- 21.3 -> 75.8 +/- 21.9 kg (point estimate away from the claim). Hip circumference fell after inulin. Short duration and small subgroups; glycemic (OGTT) improvements in OW are a separate outcome. |
| Parnell JA, Reimer RA 2009 · Am J Clin Nutr | RCT | supports | moderate | Landmark RCT: 21g/d oligofructose 12wk reduced body weight in overweight adults with suppressed ghrelin, enhanced PYY and lower energy intake |
| Cani PD, Joly E, Horsmans Y, Delzenne NM 2006 · Eur J Clin Nutr | RCT | supports | low | Single-blind crossover pilot, 10 adults (BMI 18.5-27.4), 16 g/d oligofructose vs dextrine maltose, 2 weeks each. Outcomes: 'Energy intake, hunger, satiety, fullness and prospective food consumption'; 'Total energy intake per day is 5% lower during OFS than in DM period.' No body-weight outcome - off-scope for a weight claim scoped to overweight/obese. |
| van der Beek CM, Canfora EE, Kip AM, Gorissen SHM, Olde Damink SWM, van Eijk HM, Holst JJ, Blaak EE, Dejong CHC, Lenaerts K 2018 · Metabolism | RCT | supports | moderate | Acute crossover (n=14), one 24 g inulin dose: 'Fat oxidation increased in the early postprandial phase (0-3 h)'; no body-weight outcome, and 'no effects on ... appetite and satiety scores' (the prior extract's satiety benefit is not in the paper). Off-scope for a body-weight claim. |
| Liber A, Szajewska H 2014 · Br J Nutr | RCT | contradicts | moderate | 12-wk oligofructose had no effect on BMI/body weight vs placebo in overweight/obese children |
Disagree, or know a study we missed?
We grade by evidence, not opinions. The way to weigh in is to point us to a study we haven't cited (check the evidence table above first), or to flag a problem with one we have. Every submission is reviewed; if it holds up, the grade updates and shows in Science Changes Its Mind.
Opens a short form. You'll sign in with Google so submissions are tied to a real account — we don't display your identity, and we only accept a link we can verify (PubMed, DOI, ClinicalTrials.gov).
Educational only, not medical advice. Grades and scores reflect published evidence weighted by study design and quality; see the methodology.