How Your Gut May Drive Anxiety, Brain Fog, and Weight Gain

The gut does more than digest—it may be quietly shaping your mood, stress resilience, and metabolic health.

Research microbiologist Kiran Krishnan joins “Vital Signs” to reveal why mainstream medicine still treats conditions like anxiety, obesity, and fatigue as unrelated issues, even as science increasingly points to a shared root cause: the gut microbiome.

Krishnan breaks down why most probiotics never survive long enough to work, how chronic stress and gut health can trap each other in a worsening cycle, and why a nearly extinct piece of the human diet—bitter compounds—may hold the key to fixing digestion at its source.

The conversation covers the science behind spore-based probiotics, how different bacterial strains serve distinct roles in the gut, and simple, practical steps anyone can take to build a more resilient microbiome.

Krishnan is Chief Product Formulator at Just Thrive. This episode is presented in partnership with Just Thrive.

Vital Signs viewers receive FREE 90-day Digestive Bitters ($89.97 value) with your first probiotic order

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————————————————————————————————————————————-Related/Referenced studies/reports:

Human Microbiome Project (HMP) | NIH Common Fund

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GUT HEALTH AND BRAIN/MENTAL HEALTH

The Netherlands Study of Depression and Anxiety (NESDA): rationale, objectives and methods – Penninx – 2008

Systematic review with meta-analysis: the prevalence of anxiety and depression in patients with irritable bowel syndrome

Bifidobacterium longum 1714™ Strain Modulates Brain Activity of Healthy Volunteers During Social Stress

Basal and LPS-stimulated inflammatory markers and the course of individual symptoms of depression – PubMed

Basal and LPS-stimulated inflammatory markers and the course of anxiety symptoms – PubMed

Moderators for depressed mood and systemic and transcriptional inflammatory responses: a randomized controlled trial of endotoxin – PubMed

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JUST THRIVE FORMULA-RELATED STUDIES 

HU58 safety pilot in hepatic encephalopathy, 2020

HU58 trial in children with antibiotic-associated diarrhea, 2025

Five-strain spore formulation trial in elevated triglycerides, 2020 

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RELATIVE MICROBIOME DIVERSITY

Schnorr et al. Hadza and urban Italian microbiomes, 2014 

Carter et al. Deep sequencing of Hadza microbiomes, 2023

Martínez et al. Rural Papua New Guinean gut microbiota, 2015 

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PROBIOTICS AND METABOLISM

Prebiotic/probiotic supplementation resulted in reduced visceral fat and mRNA expression associated with adipose tissue inflammation, systemic inflammation, and chronic disease risk

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Vital Signs’ host, guests, and contributors offer general information on improving health and wellness. This is not intended as diagnosis or medical advice. You should consult your medical doctor or holistic doctor before enacting any suggested strategies for health and wellness improvement, including those in relation to preventing or treating specific diseases featured on this program.