Fiber Greens Research
Fiber Greens Clinical Research
Every health claim backed by peer-reviewed science. Direct links to 15+ published studies demonstrating the proven benefits of the prebiotic fibers in Fiber Greens for digestive health, blood sugar, appetite control, and gut microbiome support.
The Science Behind Fiber Greens
Every health claim we make is supported by rigorous clinical research published in peer-reviewed medical journals. Below you'll find direct links to the studies demonstrating the proven benefits of our triple-prebiotic fiber system.
All studies are accessible through PubMed (U.S. National Library of Medicine).
Digestive Support & Gut Health
Research demonstrating how PHGG (Partially Hydrolyzed Guar Gum), inulin, and gum acacia support healthy digestion, regular bowel movements, and a thriving gut microbiome.
PHGG improves gut health, sleep, and motivation among healthy subjects
Abe A, Morishima S, Kapoor MP, et al. (2023)
Key Findings:
- 5g/day PHGG significantly improved defecation comfort and frequency
- Reduced fecal odor indicating improved gut fermentation
- Maintained higher levels of beneficial SCFA-producing bacteria
- Improved sleep quality and motivation scores via brain-gut axis
PHGG versus placebo in the treatment of irritable bowel syndrome
Niv E, Halak A, Tiommny E, et al. (2016)
Key Findings:
- 6g/day PHGG for 12 weeks improved IBS symptom severity scores
- Improved quality of life scores in IBS patients
- Prebiotic fiber mechanism modulated gut microbiota beneficially
- Well-tolerated with no significant adverse effects
Effect of repeated consumption of PHGG on fecal characteristics and gut microbiota
Yasukawa Z, Inoue R, Ozeki M, et al. (2019)
Key Findings:
- 3-month PHGG supplementation significantly improved stool form (Bristol Stool Scale)
- Significant increase in Bifidobacterium (key beneficial bacteria)
- No adverse effects on stool frequency — gentle regulation
- Confirmed prebiotic mechanism through microbiome analysis
Prebiotic effect of Jerusalem artichoke inulin: a human intervention study
Tuohy KM, Kolida S, Lustenberger AM, et al. (2010)
Key Findings:
- 5g/day Jerusalem artichoke inulin significantly increased Bifidobacteria
- Increased Lactobacillus/Enterococcus populations
- >90% compliance rate indicating excellent tolerability
- No significant adverse effects beyond mild flatulence
Acacia gum is a bifidogenic dietary fibre with high digestive tolerance in healthy humans
Cherbut C, Michel C, Raison V, et al. (2003)
Key Findings:
- 10-15g/day acacia gum increased Bifidobacteria and lactic acid bacteria
- ~95% fermentability in the colon
- Stool weight increased by 30% (improved bulk)
- Excellent digestive tolerance — no adverse GI effects
Blood Sugar & Glucose Control
Research demonstrating how PHGG helps reduce postprandial glucose spikes, improve insulin sensitivity, and support healthy blood sugar levels already within the normal range.
PHGG markedly impacts postprandial hyperglycaemia, hyperlipidaemia and incretin metabolic hormones
Kapoor MP, Ishihara N, Okubo T. (2016)
Key Findings:
- Reduced postprandial blood glucose by up to 50%
- Significantly reduced postprandial insulin and triglyceride levels
- Lowered LDL (bad) cholesterol and increased HDL (good) cholesterol
- 3 of 6 glucose-intolerant subjects became normal glucose-tolerant after 3 months
Multi-component program based on PHGG (Sunfiber) improves glycemic control
Kim et al. (2025)
Key Findings:
- Fasting glucose decreased from 113 to 106 mg/dL (p<0.05)
- HbA1c decreased from 6.08% to 5.87% (p<0.05)
- 82.1% of participants reported positive gut health changes
- Significant improvements in comprehensive nutrition scores
Systematic review and meta-analysis: PHGG prevents constipation at 5-7g/day
Kapoor MP, et al. (2017)
Key Findings:
- 5-7g/day PHGG is sufficient to prevent constipation
- Confirmed prebiotic mechanism across multiple populations
- Dose-response relationship established
- Fiber Greens delivers 4g PHGG + 700mg inulin + 500mg acacia per serving
Appetite Control & Weight Management
Clinical evidence showing how PHGG reduces snacking, increases satiety hormones, and supports comfortable appetite control without bloating.
Post-meal perceivable satiety and subsequent energy intake with intake of PHGG
Rao TP, Hayakawa M, et al. (2015)
Key Findings:
- 5g PHGG produced acute perceivable post-meal satiety
- 2g/day for 2 weeks reduced whole-day snacking energy intake by ~20%
- PHGG works via intestinal SCFA production — no stomach bloating
- Ideal natural soluble fibre for comfortable appetite control
Role of guar fiber in appetite control: a comprehensive review
Rao TP. (2016)
Key Findings:
- Guar fiber delays colonic transit time — food digests slower
- Increases release of satiety hormone CCK (cholecystokinin)
- Provides both immediate and sustained post-meal satiety effects
- Works in the intestine, not the stomach — no bloating sensation
Hydrolyzed guar fiber increases postprandial CCK during controlled weight loss
Heini AF, Lara-Castro C, et al. (1998)
Key Findings:
- PHGG produced a heightened postprandial CCK (satiety hormone) response
- Earlier CCK peak (15 min vs 30 min) — faster satiety signal
- Confirmed physiological mechanism for appetite control
- Safe and well-tolerated during controlled weight-loss program
Gut Microbiome & Prebiotic Effects
Studies confirming how the triple-prebiotic system in Fiber Greens feeds beneficial bacteria, increases Bifidobacterium and Lactobacillus, and produces health-promoting short-chain fatty acids.
Lifestyle related changes with PHGG dietary fiber in healthy athletes
Kapoor MP, Koido K, Kawaguchi M, et al. (2020)
Key Findings:
- 6g/day PHGG significantly increased Bifidobacterium
- Lowered abundance of harmful bacteria
- Increased energy recovery in athletes
- Reduction in diarrhea associated with improved bacterial ratios
Dose response effects of PHGG on gut microbiome of healthy adults
Edelman M, Wang Q, Ahnen R, Slavin J. (2024)
Key Findings:
- Even low doses (3g and 6g) of PHGG modulated gut microbiome in healthy adults
- Significant changes in bacterial taxa at both dose levels
- Improved stool consistency (Bristol Stool Form Scale)
- Confirmed prebiotic effects extend beyond clinical populations to everyday users
Manipulation of gut microbiota using acacia gum polysaccharide
Published in ACS Omega (2021)
Key Findings:
- Acacia gum (A. seyal) promoted Bifidobacteria growth comparable to FOS
- Inhibited Clostridium histolyticum (harmful bacteria associated with gut dysbiosis)
- Increased short-chain fatty acid production
- Both Acacia senegal and seyal species demonstrated prebiotic effects
Why Fiber Greens Is Different
Most fiber supplements use a single source of psyllium husk — a basic bulking fiber that causes bloating and gas. Fiber Greens features three clinically validated prebiotic fibers that feed your gut bacteria, support blood sugar, and control appetite — without the discomfort.
Research Transparency: All studies cited are published in peer-reviewed medical journals and are accessible through PubMed (U.S. National Library of Medicine). We provide direct links to ensure complete transparency and scientific credibility. Citations are accurate as of the publication date of this page.
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