Webinar Recap: Fiber Beyond Digestion — The Metabolic, Hormonal, and Microbiome Science Behind Fiber Plus

Webinar Recap: Fiber Beyond Digestion — The Metabolic, Hormonal, and Microbiome Science Behind Fiber Plus

Webinar Recap: Fiber Beyond Digestion — The Metabolic, Hormonal, and Microbiome Science Behind Fiber+

Why fiber is one of the most underutilized clinical tools for metabolic health, microbiome diversity, and healthy aging — especially for women in perimenopause and beyond.

Most conversations about fiber begin and end with bowel regularity. But the research tells a much more expansive story. Fiber influences short-chain fatty acid production, insulin sensitivity, cardiovascular risk, microbiome composition, and systemic inflammation — effects that extend to virtually every system in the body.*

In a recent Enzyme Science webinar, Dr. Hana Rosenthal, naturopathic physician and acupuncturist in residency at Open Wellness in Portland, Oregon, presented the independent scientific research behind Fiber+ — exploring how this prebiotic and postbiotic blend was designed to address fiber's broader clinical role, with particular relevance for women navigating perimenopause and beyond.*

[Watch the Webinar Replay →]

In this session, Dr. Rosenthal covers:

  • Why 94% of Americans fall significantly short of fiber recommendations — and what that means for long-term health
  • The unique metabolic properties of resistant starch and why it's the most under-consumed fiber type
  • How Akkermansia muciniphila connects fiber intake to insulin sensitivity, gut barrier function, and satiety*
  • The clinical case for acacia fiber as a gentle, FODMAP-friendly prebiotic for sensitive patients*
  • Why perimenopause is a critical window for fiber intervention — and how the formula addresses that transition*
  • Practical dosing and patient selection strategies for clinical integration

The Fiber Gap Is Bigger Than Most Practitioners Realize

The minimum recommended daily fiber intake is 25 grams for women and 38 grams for men. According to data published in the New England Journal of Medicine in 2024, the average American adult consumes only about 17 grams per day — roughly half of what's recommended. More strikingly, 94% of Americans do not meet adequate fiber intake levels.

This isn't a minor gap. It's a population-wide deficiency with real clinical consequences. The Academy of Nutrition and Dietetics has noted that populations consuming higher dietary fiber have lower rates of chronic disease, with higher intakes associated with reduced risk of cardiovascular disease, type 2 diabetes, and certain cancers.

Within the broader fiber category, one type stands out as especially depleted: resistant starch. Historical intake is estimated at 25–40 grams per day. Current U.S. intake? Only 2.5 to 5 grams. That dramatic decline matters, because resistant starch isn't just adding bulk — it's feeding the microbes that produce the metabolites driving fiber's systemic health effects.*

What Makes Resistant Starch Different

Resistant starch is a unique carbohydrate that resists digestion in the small intestine and arrives in the colon intact, where gut bacteria can ferment it and produce beneficial short-chain fatty acids (SCFAs). Unlike most fibers, it occupies a rare dual category: insoluble yet fermentable.

This fermentability is what makes it clinically significant. Research shows that resistant starch supplementation can meaningfully support fasting glucose, insulin levels, and hemoglobin A1C in patients with metabolic syndrome, while also supporting healthy total cholesterol, LDL cholesterol, and the inflammatory marker TNF-alpha.* The microbiome shifts toward butyrate-producing bacteria — a change with far-reaching effects on gut barrier integrity, immune regulation, and metabolic signaling.*

Solnul™: Resistant Potato Starch, Clinically Studied

Fiber+ features Solnul™, an RS2 resistant potato starch upcycled from the potato processing industry. Four human double-blind, placebo-controlled studies on Solnul™ demonstrate increases in Bifidobacterium species, Akkermansia muciniphila, SCFA production, and serum choline, vitamin A, and vitamin E.*

A systematic review and meta-analysis from the American Journal of Clinical Nutrition examining 64 studies with over 2,000 participants found that dietary fiber intervention significantly increased Bifidobacterium and Lactobacillusspecies and raised fecal butyrate concentrations. A 2023 narrative review of randomized trials published in Nutrition Research found that resistant starch consumed for 4 to 12 weeks improved cardiometabolic outcomes — including glycemic control, lipid profiles, and inflammatory markers — in adults with pre-diabetes and type 2 diabetes.*

Akkermansia: Why This Bacterium Matters

Akkermansia muciniphila is a mucin-loving bacterium that resides in the gut's mucosal layer, typically comprising 1–4% of total fecal microbiota. It's increasingly recognized as a marker of metabolic health — and a key target of resistant starch supplementation.*

Research supports Akkermansia's role in:

  • Metabolic health — A 2019 study in Nature Medicine found that pasteurized Akkermansia supplementation in insulin-resistant volunteers improved insulin sensitivity by approximately 29%, reduced insulinemia by 34%, and decreased total cholesterol by nearly 9% compared to placebo, with trends toward reduced body weight and fat mass.*
  • Gut barrier integrity — A 2025 review confirmed that Akkermansia strengthens intestinal barrier function through SCFA production and TLR2 activation.*
  • Satiety and thermogenesis — A protein called P9 secreted by Akkermansia has been shown in preclinical models to induce GLP-1 secretion and increase thermogenesis in brown adipose tissue.*

By selectively feeding Akkermansia through resistant starch, Fiber+ supports the metabolic functions this organism provides.*

Acacia Fiber (PurAcacia™): Gentle Prebiotic Support for Sensitive Patients

The second key fiber in the formula is acacia fiber — derived from the sap of acacia trees and dried into a soluble, slow-fermenting prebiotic powder. Its slow fermentation rate is what makes it particularly valuable clinically: less rapid gas production means fewer GI side effects like bloating and discomfort, making it appropriate for patients who haven't tolerated other fiber supplements.*

Clinical evidence for acacia fiber includes:

  • Significant increases in Bifidobacteria and Lactobacilli in healthy volunteers over four weeks*
  • Increased SCFA production — specifically acetate, propionate, and butyrate — in fermentation studies*
  • In an RCT in patients with type 2 diabetes, 3 months of acacia supplementation decreased BMI by 2%, visceral adiposity index by nearly 24%, and systolic blood pressure by approximately 8%*

The PurAcacia™ in Fiber+ is also FODMAP-friendly — a meaningful consideration for patients with IBS, SIBO, or general gut sensitivity.*

Probiotic and Postbiotic Support: Completing the Ecosystem

Fiber+ goes beyond fiber alone by including targeted microbial support:

Bacillus coagulans (2 billion CFU) — A spore-forming probiotic that survives gastric transit intact, reaching the intestines where it can support stool frequency and consistency while reducing bloating and discomfort.*

Bifidobacterium longum HTE-1 (postbiotic) — Postbiotics are nonviable bacterial products that deliver health benefits without requiring the bacteria to survive and colonize. This postbiotic works synergistically with Bacillus coagulans to promote commensal bacteria and enhance SCFA production.*

Together, these components shift Fiber+ from a simple fiber supplement into a formula designed to actively modulate the gut ecosystem — providing the fermentation substrate, the fermenting organisms, and support for the metabolic byproducts of that fermentation.*

Why Fiber Is Foundational for Perimenopause and Beyond

This is where Dr. Rosenthal's clinical perspective becomes especially relevant. As patients move into perimenopause and post-menopause, Fiber+ directly addresses several converging physiological shifts:

Metabolic Health — Women not meeting fiber recommendations have 4.24 times higher odds of metabolic syndrome compared to those with adequate intake. As insulin sensitivity naturally declines with hormonal changes, fiber's role in blood glucose regulation becomes increasingly critical.*

Cardiovascular Protection — A cohort study of 7,700 post-menopausal women found that women in the highest fiber intake group had 15% lower all-cause mortality and 31% lower cardiovascular mortality compared to those in the lowest. A review in The Lancet Diabetes & Endocrinology identified menopause as a cardiometabolic transition point where dietary modification, including fiber, is a valid preventive strategy.*

Microbiome Shifts — Research shows that menopause is associated with reduced gut microbiome diversity and altered composition. Post-menopausal women show lower microbial diversity and GLP-1 levels compared to premenopausal women — patterns that dietary fiber, prebiotics, and postbiotics can help restore.* A 2025 review in Aging Researchhighlighted that hormonal shifts contribute to dysbiosis and "inflammaging" — chronic low-grade inflammation associated with aging — both of which Fiber+ directly addresses.*

Gut Barrier Integrity and Inflammation — SCFAs produced from fiber fermentation enhance epithelial barrier function, increase regulatory T cell activity, and decrease inflammatory cytokine expression.* For aging patients particularly, supporting this barrier is key to long-term immune and metabolic resilience.*

Clinical Integration: Patient Populations and Practical Guidance

Dr. Rosenthal recommends Fiber+ for:

  • Patients with low dietary fiber intake (again — that's 94% of Americans)
  • Those with metabolic dysfunction, pre-diabetes, or blood sugar dysregulation*
  • Women in perimenopause or menopause experiencing metabolic shifts*
  • Patients recovering from antibiotic use seeking to restore microbiome diversity*
  • Patients who have not tolerated other fiber supplements due to bloating or GI discomfort*

A note on dosing: Dr. Rosenthal recommends starting with a half scoop and gradually increasing over one to two weeks to allow the microbiome to adapt. The metabolic and microbiome benefits seen in clinical trials developed over 4 to 12 weeks — this is a foundational, long-term intervention, not a quick fix.

Not appropriate for: Patients with severe gastroparesis, bowel obstruction, or those in an active IBD flare.

Suggested Use: 1 scoop daily providing 5g of fiber (18% DV), or as directed by a healthcare practitioner.*

Watch the Full Webinar

Dr. Rosenthal's complete presentation covers the full research behind each ingredient, the mechanisms connecting fiber to metabolic and hormonal health, and her clinical approach to patient selection and protocol design.

[Watch the Webinar Replay →]

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