#556: Can We Restore the Gut Microbiome Through Dietary Changes? – Anissa Armet, PhD

Introduction to this Episode

There is research suggesting that industrialization has significantly altered the composition of our gut microbiota, with certain microbial species now absent in many industrialized populations.

Given the known associations between gut microbiome diversity and health, researchers have begun investigating whether restoring lost microbial species and adopting dietary patterns similar to those of non-industrialized populations could lead to measurable health benefits.

In a newly-published study, the investigators aimed to explore whether L. reuteri could be successfully reintroduced into the microbiome through the “Restore Diet” and whether such a shift would result in improvements in key cardiometabolic and inflammatory markers.

One of the authors, Dr. Anissa Armet, is on the podcast to discuss this area and both the potential and limitations of microbiome restoration efforts.

Useful Terminology for this Episode

Key Terms & Acronyms

• Microbiome: The collective genetic material of all the microorganisms, including bacteria, viruses, fungi, and archaea, that reside in a specific environment, such as the human gut. It plays a critical role in digestion, immunity, and overall health.
• Microbiota: The community of microorganisms that inhabit a particular environment, such as the gut microbiota in the human digestive tract. Unlike the microbiome, which refers to genetic material, microbiota specifically refers to the organisms themselves.
• Non-Industrialized Population: A group of people living in a society with minimal exposure to industrial influences, including processed foods, antibiotics, and urbanized sanitation systems.
• Persistence: In microbiome research, persistence refers to the ability of a microbial species, such as a probiotic strain, to remain in the gut microbiome over time after being introduced through dietary or supplemental means. Long-term persistence is essential for sustained health benefits.
• Probiotic: Live microorganisms, typically bacteria or yeast, that confer health benefits to the host when consumed in adequate amounts. They are commonly found in fermented foods or supplements and are used to promote gut health and restore microbial balance.
• Prebiotic: A type of dietary fiber or non-digestible compound that selectively stimulates the growth and activity of beneficial bacteria in the gut microbiota. Prebiotics serve as a food source for probiotics and contribute to gut microbiome health.
• Short-Chain Fatty Acids (SCFAs): Metabolites produced by gut bacteria through the fermentation of dietary fiber. SCFAs, such as acetate, propionate, and butyrate, play a key role in regulating inflammation, maintaining gut barrier integrity, and supporting metabolic health.
• Machine Learning: A subset of artificial intelligence that uses statistical algorithms to identify patterns and relationships within complex datasets. In microbiome research, machine learning helps analyze microbial and metabolic data to predict health outcomes and assess the impact of dietary interventions.

Gut Microbiome Restoration

Key Concepts

• Definition:
  • The process of modifying the gut microbiome to resemble a healthier or more balanced state.
  • Context-dependent restoration is defined relative to a reference microbiome.
• Changes in the Microbiome Over Time:
  • Industrialized nations (e.g., North America, Europe) have altered gut microbiomes