Primary vs Secondary Immune Deficiencies

Allergies, chronic inflammation, and constant exposure to environmental toxins are reshaping how our immune system functions, often in ways that go unnoticed until symptoms appear. What many people see as isolated issues like gut problems, skin reactions, or fatigue may actually reflect a deeper immune imbalance.

In this episode of Extend, I sit down with Dr. Tania Elliott, double board-certified physician in internal medicine and allergy and immunology, to unpack how the immune system operates across infection defense, hypersensitivity, and autoimmunity, and how modern exposures like microplastics, synthetic chemicals, and ultra-processed products are disrupting this balance. We break down how chronic inflammation begins, why gut health is central to immune regulation, and how everyday products in your home may be silently driving immune dysfunction.

We also explore how simple, high-impact changes like reducing toxin exposure, improving indoor air quality, and retraining the immune system through targeted therapies can restore balance and reduce long-term disease risk.

Dr. Tania Elliott is a double board-certified physician in internal medicine and allergy and immunology, focused on helping patients understand immune health, reduce toxic exposures, and apply practical, science-backed strategies to improve resilience, longevity, and overall well-being.

What We Discuss:

• (09:07) Immune system explained in three core functions

• (10:42) How chronic inflammation begins

• (11:13) Gut health and microbiome disruption

• (12:50) Signs your immune system is out of balance

• (15:39) Environmental toxins and ultra-processed foods

• (17:39) Skincare, sunscreen, and endocrine disruptors

• (21:33) Microplastics and hidden daily exposure

• (24:00) Teflon, PFAS, and long-term health risks

• (30:01) Building a healthier home environment

• (40:07) Why allergies are increasing

• (41:40) Hygiene hypothesis and early exposure

• (45:10) Peanut allergy and early introduction

• (50:01) Recurrent infections and immune deficiency

• (51:21) Immune testing and biomarkers

• (52:30) IVIG therapy and immune support

• (57:11) Allergy immunotherapy and long-term solutions

Thank You to Our Sponsors:

Function Health: Learn more and join using my link. Visit www.functionhealth.com/drshah and use gift code DRSHAH25 for a $25 credit toward your membership.

Momentous: Head to www.livemomentous.com/fiber and use code DRSHAH for up to 35% off your first order.

Learn more about Dr. Shah:

Website: drshah.com

Clinic: next-health.com

Instagram: darshanshahmd

Learn more about Dr. Tania Elliott:

Website: Dr. Tania Elliott

Instagram: drtaniaelliott

LinkedIn: Tania Elliott, MD