A groundbreaking study published in Clinical Nutrition ESPEN has revealed something remarkable: a simple prebiotic fibre — partially hydrolyzed guar gum (PHGG) — may significantly reduce the risk of influenza infection.

You can read the full study here.

The research followed 522 elderly hospital patients over two years. Every patient received the influenza vaccine. But only some were also given PHGG daily.

The results were astonishing.

• PHGG Group: 0 Influenza Cases
• Non-PHGG Group: 24 Influenza Cases

In the long-term care ward, 85.7% of non-PHGG patients contracted influenza — compared to 0% of those taking PHGG.

Why Did PHGG Make Such a Difference?

PHGG is a high-fermenting prebiotic, meaning it feeds the good bacteria in your gut. When these bacteria ferment PHGG, they produce short-chain fatty acids (SCFAs) such as butyrate — compounds known to strengthen immunity and regulate inflammation.

The study found that people taking PHGG had:

• Lower stool pH (indicating more SCFA production)
• Better stool form (healthier gut motility and balance)
• Dramatically lower rates of influenza

Patients who did get influenza had the opposite profile: high stool pH and very poor stool form — classic signs of a disrupted gut environment.

What This Means for Everyday Health

Although this study was done in hospitalised elderly patients, it highlights something powerful:
 Your gut environment strongly influences your immune resilience.

PHGG may support your immune system by:

• Feeding beneficial gut bacteria
• Increasing protective SCFAs
• Improving stool consistency and gut function
• Helping your body respond more effectively to infection

If you’re looking to support gut health and immunity naturally, choosing a high-purity PHGG supplement is one of the most evidence-backed options.

Looking for high-quality PHGG? 

Here’s where to buy partially hydrolyzed guar gum.

Disclaimer

This article is for educational purposes only and does not constitute medical advice. Please consult your health practitioner before making changes to your diet or supplement routine. 

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