Podcast Summary: Chasing Life – "Why Allergies Are Getting Worse"

Host: Dr. Sanjay Gupta
Guest: Dr. Zachary Rubin, Pediatric Allergist & Clinical Immunologist
Date: March 20, 2026

Episode Overview

On this episode, Dr. Sanjay Gupta dives deep into the alarming increase in allergies, both seasonal and food-related, with Dr. Zachary Rubin, a pediatric allergist and clinical immunologist, and author of "All About Allergies". Together, they explore why allergies are becoming more of an issue, the science behind allergic reactions, how environmental and lifestyle changes play a role, and practical advice for people affected by allergies and those looking to support them.

Main Discussion Points & Insights

When Should You See an Allergist?

• If over-the-counter medications for seasonal allergies or hay fever aren't effective, seek formal testing with an allergist.
• Allergists offer immunotherapy, a treatment that can retrain your immune system to become less reactive to allergens and possibly reduce risk of developing new allergies or asthma, especially in children.
  • Dr. Rubin: “Immunotherapy is actually a disease-modifying treatment … we can train your immune system to become less reactive through controlled exposure.” [02:56]

Why Do We Have Allergies?

• Possible evolutionary roots—ancient evidence suggests allergies were protective responses against toxins or parasites in food.
  • “It’s probably as a protective measure against toxins or parasites that were found in food. And it became this more exaggerated response.” – Dr. Rubin [03:48]

Recognizing Serious Allergy Symptoms

• Signs to see an allergist: chronic sinus headaches, severe nasal congestion, insomnia despite medications, or severe eczema/asthma not managed by primary treatments.
  • “We fill a niche … we look at the immune system and say, why is it responding abnormally to these foreign substances?” – Dr. Rubin [04:28]

Are Allergies Getting Worse?

Short answer: Yes.

• Environmental factors:
  • Rising temperatures (more CO₂) lengthen pollen seasons and raise pollen counts.
  • Air pollution and disruptions to the gut microbiome (from early antibiotic, antacid use, C-sections) also contribute.
• Prevalence: Allergic diseases are now among the top 10 chronic diseases in the U.S.
  • “Our pollen counts have been steadily rising, so people are exposed to more … more people are developing allergies.” – Dr. Rubin [05:43]

Diagnosis & Allergy Testing

• Allergists typically use skin prick testing for rapid results—to measure IgE antibody response, indicating sensitization to specific allergens.
  • “We’ll put the extracts of these allergens … on their skin, let that sit for about 15 minutes …” [07:25]
• Blood testing is another tool, particularly when skin testing isn’t possible.

The Life Impact of Allergies

• Severity varies from minor annoyance to life-threatening (anaphylactic reactions).
• Even ‘minor’ allergies can cause sleep problems, recurrent sinus or ear infections, and impact quality of life.
  • “I often talk about the nose being the gateway to your overall health.” – Dr. Rubin [09:01]

Allergy Misinformation & Societal Attitudes

• Food allergies are often minimized or joked about, leading to dangerous situations and bullying.
  • Memorable story: Texas high schooler bullied for peanut allergy; forced to switch schools [09:38]
  • “Your story matters, we need to help educate and advocate … it’s not a fad diet. It’s not some type of choice.” – Dr. Rubin [10:10]
• Doctors must balance validating patient experiences and scientific testing.

Food Allergies vs. Intolerances vs. Sensitivities

• Intolerance: Digestive issue—trouble processing certain foods (e.g., lactose), not immune-related, not life-threatening.
• Allergy: Immune-mediated, often immediate; even tiny amounts can trigger symptoms ranging from hives/itching to anaphylaxis.
• Sensitivity: Ill-defined, not a scientific term; symptoms are vague or not linked to immune pathways.
  • “A sensitivity is an unscientific term, it’s not validated … I believe my patients, but I can’t get a test to verify this as a sensitivity.” – Dr. Rubin [14:48]

How Allergic Reactions Happen

• Requires prior exposure/sensitization: immune system ‘learns’ to see an allergen as a threat, creates specific IgE antibodies.
• Mast cell activation on re-exposure releases histamine, causing symptoms.
• Autoimmune Disease vs Allergy: Allergy—immune system attacks foreign substances; Autoimmune—attacks self.
  • “Allergy, autoimmunity, oncology, cancer, all of it is connected.” – Dr. Rubin [16:31]

Case Study: Food-Dependent, Exercise-Induced Anaphylaxis

• Dr. Gupta shares his own experience: developed a severe mango allergy after exercising, despite years of tolerance.
  • Exercise, elevated temperature, illness, NSAIDs, or alcohol can ‘tip’ the immune system into reacting.
  • “You eat mangoes all the time, no problem. But if you exercise intensely … your immune system may all of a sudden start to react …” – Dr. Rubin [19:44]

Outgrowing Allergies & Return of Tolerance

• Some childhood allergies (milk, egg) often resolve over time, especially if tolerated in baked or processed form; others (peanuts, tree nuts, shellfish) tend to persist.
  • “Foods like peanuts, tree nuts, shellfish, tend to be more persistent and less likely to go away.” [20:50]

Managing Food Labels and Allergen Warnings

• U.S. increased allergen labeling (e.g., adding sesame), but “may contain” labels are often precautionary, not always indicative of risk; this creates confusion and anxiety.
  • “Precautionary labels … are a real challenge because it creates unnecessary anxiety … Many folks can tolerate it.” – Dr. Rubin [24:19][25:40]

Early Allergen Exposure & Evolving Recommendations

• In early 2000s, guidelines said to avoid allergens like peanut early in life; new evidence (LEAP study) shows early, controlled introduction actually reduces risk of developing allergies.
  • “Early introduction group was reduced by 80% … we’re now seeing the benefits.” – Dr. Rubin [26:49]
  • “Our understanding of science and medicine evolves. That’s part of the scientific method.” [26:49]
• Exception: If a baby already has severe eczema or egg allergy, consult an allergist first.

Diagnostic Challenges

• Misdiagnoses are common; rare allergens (e.g., Balsam of Peru) can masquerade as autoimmune issues.
• Important for patients to find dedicated allergists and to be patient—understanding is still growing.
  • “Sometimes it takes a while to figure it out because our testing is limited, our understanding is limited … we have a long ways to go.” [28:43]

Living Fully with Allergies

• Education is crucial—understanding the condition reduces fear and anxiety.
• Mental health support is available: therapists specializing in allergy-related anxiety can help families cope.
  • “The knowledge portion, I think, decreases a lot of anxiety … there are actually specialized therapists.” – Dr. Rubin [30:10]

Notable Quotes and Memorable Moments

• On Immunotherapy:
  “Immunotherapy … we can train your immune system to become less reactive through controlled exposure.”—Dr. Rubin [02:56]

• On Societal Misunderstandings:
  “How could something you eat that sustains you potentially end you? … It doesn’t really make sense, but this does happen and it affects close to 10% of Americans.”—Dr. Rubin [10:10]

• On Misinformation:
  "Food allergy is the butt of a lot of jokes. It’s not taken seriously online."—Dr. Rubin [09:38]

• On Medical Evolution:
  “Our understanding of science and medicine evolves. That’s part of the scientific method.”—Dr. Rubin [26:49]

• On Anxiety and Coping:
  “When you learn more about it, you’re able to take that knowledge and apply it to everything … there are actually specialized therapists who deal with this day in, day out …” —Dr. Rubin [30:10]

Timestamps for Key Segments

• 00:03: Episode introduction, what are allergies and why do they matter?
• 02:30: When to see an allergist, benefits of immunotherapy
• 03:41: Evolutionary reasons for allergies
• 05:43: Why allergies are getting worse; environmental and lifestyle contributors
• 07:25: What happens at an allergist's office? Diagnosis process
• 09:38: Food allergy stigma and bullying (Texas football player story)
• 13:25: Allergy vs. intolerance vs. sensitivity
• 16:31: What happens in the body during an allergic reaction; link to autoimmune diseases
• 18:28: Dr. Gupta’s personal mango allergy story
• 19:44: Food-dependent, exercise-induced anaphylaxis; complexities in triggers
• 23:54: Food labeling and real vs. precautionary warnings
• 26:49: Early allergen introduction — shifting guidelines
• 28:43: Challenging case of rare allergies; patient journey
• 30:10: Coping strategies and mental health support for allergy sufferers

Conclusion

This episode provides a thorough, compassionate examination of the science and lived realities of allergies today. Dr. Rubin’s expertise helps debunk myths, clarify the difference between allergy, intolerance, and sensitivity, and offers hope, emphasizing that with education and the right support, individuals and families can live full, empowered lives despite allergies.