ORIM Weekly W37 2022

EDITORIAL

The human microbiome contains more cells than the human body itself. This week, we take a systems-level view of how this microbial ecosystem influences every aspect of health, from digestion to mood to immune defense, and what the latest research reveals.

The Microbiome as an Organ

The collective genome of gut microbiota encodes 100 times more genes than the human genome, producing thousands of metabolites that influence host physiology. A 2021 review in Cell Host & Microbe proposed reclassifying the gut microbiome as a virtual endocrine organ, given its production of serotonin (95% made in the gut), short-chain fatty acids, neurotransmitters, and vitamins K2 and B12 in physiologically significant quantities.

Microbiome Diversity and Disease Resistance

Shannon diversity index, a measure of microbial species richness and evenness, has emerged as a reliable predictor of health outcomes. A 2021 prospective cohort study in Nature Medicine found that individuals in the lowest quartile of microbiome diversity had 2.3 times higher risk of type 2 diabetes, 1.8 times higher cardiovascular disease risk, and 40% more sick days over a 10-year follow-up period.

Antibiotics and Microbiome Recovery

A single course of broad-spectrum antibiotics reduces gut microbial diversity by 25-30%, with some species failing to recover for up to 12 months. Research in Nature Microbiology (2021) identified Faecalibacterium prausnitzii as particularly vulnerable to ciprofloxacin, with depletion persisting for 6+ months. Targeted probiotic (S. boulardii) and prebiotic (FOS, inulin) support during and after antibiotics significantly accelerated diversity recovery.

Jerusalem Artichoke (Helianthus tuberosus)

Despite its name, this tuber is native to North America and unrelated to artichokes. It is one of the richest food sources of inulin, a prebiotic fiber that selectively feeds Bifidobacterium and Lactobacillus species. Its iron and potassium content exceed potatoes, and it provides 20% of daily thiamine per serving. The nutty, slightly sweet flavor shines when roasted, pureed, or sliced raw into salads.

Introduce Jerusalem artichokes gradually. Their high inulin content can cause significant gas in unaccustomed digestive systems. Start with 50g and increase over 2 weeks as your microbiome adapts.

THIS WEEK IN BRIEF

► MICROBIOME: European Human Microbiome Action consortium launches 5-year, 100-million-euro research program to develop microbiome-based diagnostics and therapeutics across EU member states.

► INNOVATION: Swiss biotech Pharmabiome advances fecal microbiota transplant capsules into Phase II trials for recurrent C. difficile infection, offering a non-invasive alternative to colonoscopy delivery.

► NUTRITION: American Gastroenterological Association updates clinical guidelines to recommend fermented food consumption alongside antibiotic prescriptions for microbiome preservation.

ORIM Tip: After any antibiotic course, immediately begin a 4-week microbiome recovery protocol: daily kefir or yogurt, two servings of prebiotic-rich vegetables (leeks, garlic, onions, artichokes), and Saccharomyces boulardii supplementation to accelerate diversity restoration.