Cold and flu season is approaching, and keeping your defenses strong is top of mind. What many don’t realize is just how much your gut health influences your body’s immune response.
Studies suggest that maintaining a balanced gut microbiome can support immune resilience, potentially reducing the frequency and severity of cold symptoms. A clinical trial published in the European Review for Medical and Pharmacological Sciences explored this connection, examining how Sunfiber® (partially hydrolyzed guar gum or PHGG) may impact immune health and ease common cold symptoms.
Why Gut Health Matters for Immunity
We’ve all had those days when a runny nose, low energy, or digestive upset throws off our routine. Research continues to confirm that gut health plays a key role in how the body responds to these challenges.
The gut microbiome produces beneficial compounds, such as short-chain fatty acids (SCFAs), which help regulate immune function. Since nearly 70% of the immune system resides in the gut, supporting digestive balance is one of the smartest ways to prepare for seasonal challenges.
In a placebo-controlled, double-blind, randomized study from Japan, researchers followed 96 healthy adults over 12 weeks. Participants consumed either 5.2 grams of Sunfiber daily or a placebo, with outcomes measured by:
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Cold-like symptoms, recorded in participant diaries
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SCFA levels in stool samples
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Immune markers in blood
The findings underscored how digestive health and immune resilience are closely linked.
What Researchers Found
More Symptom-Free Days
Adults taking Sunfiber reported significantly more days without cold symptoms compared to the placebo group.
Reduction in Cold Symptoms
Sunfiber use was associated with fewer and less severe common cold symptoms, including:
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Runny nose and nasal congestion
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General fatigue and chills
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Joint discomfort
Participants also experienced fewer days with digestive issues like constipation or diarrhea, further reinforcing the gut–immune connection.
Increased Levels of SCFAs
The study also showed steady increases in SCFAs, particularly butyric acid, a postbiotic known to support both gut and immune health.
“Since 70% of the immune system resides in the gut, these findings are especially meaningful,” explains Derek Timm, PhD, RDN, Tomorrow’s Nutrition functional ingredient expert.
While not every immune marker reached statistical significance, researchers noted a strong association between improved gut function, reduced cold symptoms, and overall immune support.
Why Sunfiber® Stands Out
With more than 180 published studies, Sunfiber® is one of the most clinically researched prebiotic fibers available today. It’s gentle, effective, and unlike some fibers, it doesn’t cause excess gas or bloating.
What makes Sunfiber® unique?
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Clinically studied: Backed by 180+ published trials
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Gentle on digestion: Well-tolerated and suitable for daily use
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Easy to use: Tasteless, odorless, and mixes into virtually any food or drink
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Globally trusted: Certified Kosher, Halal, vegan, and vegetarian friendly
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Third-party certified: Non-GMO Project Verified, Clean Label Project Certified, and Monash University Low-FODMAP Certified™
Fuel Your Wellness This Season
As cold and flu season approaches, take proactive steps to support your body’s defenses. Adding Sunfiber® to your daily routine can help you stay balanced, enjoy more symptom-free days, and feel your best.
Ready to prepare for the season ahead? Support your gut health with Tomorrow’s Nutrition Sunfiber®, a simple, science-backed way to promote digestive balance and immune resilience.
Originally sourced from Sunfiber.
Disclaimer: This content is for informational purposes only and is not intended as medical advice. These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.