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Peter Attia MD277 ‒ Food allergies: causes, prevention, and treatment with immunotherapy | Kari Nadeau, M.D., Ph.D
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CHAPTERS
- 0:00 – 6:08
Kari Nadeau's Path to Food Allergy Research
After a short preview about retraining the immune system, Peter Attia introduces Kari Nadeau and her background. She describes her PhD in parasitology and the death of a child from milk allergy that led her to food allergy work and a promise to his father.
- •Nadeau's PhD focused on an enzyme in the trypanosome parasite
- •Her immunology interest grew from IgE's role in killing parasites
- •As a fellow she encountered a child who died of milk allergy and whose liver went to a recipient with the same allergy
- •She promised the boy's father to work to prevent further deaths and to teach epinephrine use
- 6:08 – 10:38
The Immunoglobulin Family: IgG, IgA, IgM and IgE
Nadeau explains the classes of immunoglobulins and what each does. IgG circulates in blood, IgA protects surfaces, IgM acts as first responder, and IgE is rare but potent and tied to allergy.
- •IgG is the main protective class in plasma and drops under steroids
- •IgA is the secretory class found in saliva, gut and breast milk
- •IgM is the first responder, while IgG stays longer
- •IgE is about .005% of immunoglobulins and is the match that lights the fire behind allergies
- 10:38 – 16:23
How the Immune System Fights Viruses, Bacteria and Fungi
Nadeau walks through the pathway from macrophages to T cells to B cells and antibodies, covering cellular versus humoral immunity. She notes vaccines build on this system but that it has holes needing antibiotics and antivirals.
- •Macrophages present antigens that teach T cells
- •Memory T cells instruct B cells to make specific immunoglobulins
- •Antibody-dependent cell killing eliminates the pathogen
- •Vaccines rely on this pathway and memory T cells can last up to a hundred years
- 16:23 – 23:48
Why Viruses Are Easier to Fight Than Bacteria
Attia asks why the immune system handles viruses better than bacteria. Nadeau points to viral simplicity, bacterial complexity, and the difficulty of telling good bacteria from bad. The discussion extends to cancer evasion and lifestyle factors like sleep, diet and stress.
- •Viruses are simple, like few Lego blocks, while bacteria and fungi are far more complex
- •Bacteria are tolerated in the gut but dangerous in the blood
- •Attia compares this to cancer masking itself as self
- •Sleep, diet and exercise were linked to healthier immune function in COVID, and Attia adds stress
- 23:48 – 34:56
Food Sensitivity vs. Allergy, CRP and Celiac Disease
Nadeau distinguishes food sensitivities, which involve chemicals and different immune pathways, from IgE-mediated allergy. They discuss CRP as a marker of simmering inflammation, wheat and dairy, celiac disease, and why sensitivities may be increasing.
- •Food sensitivities such as lactose intolerance are rarely fatal
- •Sensitivities can involve IgG and cytokines and chronic inflammation
- •Diagnosis relies on elimination and tracking CRP, since there is no skin or IgE test
- •Celiac is a specific diagnosis tied to gliadin and genetics that needs professional diagnosis
- •Better diagnostics, awareness and food processing may explain rising numbers
- 34:56 – 38:44
Food Allergy Prevalence, Fatalities and Epinephrine
Attia asks about deaths from food allergy. Nadeau says fatal reactions are rare and avoidable, stresses carrying two epinephrine devices, and cites rising prevalence in children and adults and weaker odds of outgrowing milk and egg allergy.
- •Fatal reactions are rare, and she says any of them could have been avoided
- •Patients should carry two injectable epinephrine devices and use them within a minute
- •About 1 in 12 US children have a doctor-diagnosed food allergy
- •Odds of outgrowing milk or egg allergy before age five have dropped from about 80% to about 50%
- •About 1 in 30 adults have a food allergy
- 38:44 – 50:44
How a Peanut Allergy Develops and Why It Can Be Lethal
Using peanut as the example, Nadeau explains how sensitization can occur through broken skin, how IgE binds to mast cells and releases histamine and bradykinin, and how that leads to fatal reactions. Attia asks about mast cells and whether reactions worsen with each exposure.
- •Allergies occur worldwide with different leading foods by country
- •70% to 80% of the time food allergy is environmental, not genetic
- •Dry skin lets food protein in, and the body treats it like a parasite and makes IgE
- •Histamine and bradykinin cause lung and blood pressure problems
- •Mast cells, eosinophils and basophils drive the reaction, and mast cells live long in tissue
- 50:44 – 56:53
Environmental Risk Factors and Skin Care Advice
Nadeau lists factors that raise or lower allergy risk, including dirt, dogs, vitamin D, detergents, dry skin and diet diversity. She advises choosing ceramide-based emollients over petroleum-based ones, and says breastfeeding supports immune health without definitively preventing allergy.
- •She calls them the Ds: dirt, dogs, detergents, vitamin D, diversity and dry skin, noting DNA is not destiny
- •Pollution and tobacco smoke worsen dry skin
- •Avoid petroleum, paraffin and Vaseline emollients and look for natural lipids like ceramide
- •Breastfeeding supports gut and immune health but has not been shown to prevent food allergy
- 56:53 – 1:05:02
Early Food Introduction and Changing Guidelines
Attia asks about early nut exposure. Nadeau explains how old avoidance guidelines coincided with rising allergy, and the science now shows that skin exposure promotes allergy while gut exposure promotes tolerance. They then discuss whether prevalence will ever return to past levels.
- •Guidelines from 20 years ago advised avoidance on limited data, and allergy rose where they were followed
- •The gut is meant to tolerize while skin and lungs are meant to react
- •Current guidance favors feeding diverse allergens early, often and in small amounts, including nuts during pregnancy for those not allergic
- •Nadeau does not think rates will return to those of 30 years ago, and says the increase is real and mostly environmental
- 1:05:02 – 1:18:53
Immunotherapy for Food Allergy: How It Works
Attia describes witnessing a patient desensitized, and Nadeau explains oral immunotherapy for food allergy compared with allergy shots for environmental allergens. She describes the low-and-slow dosing, how T cells reshape B cell output from IgE to IgG and IgA, and the biomarkers used.
- •Immunotherapy gives back small amounts of the allergen daily, starting around 1/200 of a peanut
- •Doses rise about 25% every two weeks and later in larger steps
- •The immune system switches from IgE toward protective IgG and IgA, typically at nine months to a year
- •Blood markers guided protocol design in the trials
- •It needs to be a supervised drug because the dosing science cannot be done at home
- 1:18:53 – 1:26:22
Maintenance, Cure Rates, Safety and Access
Nadeau discusses goals of about 600 mg and maintenance of one to two nuts daily, plus access outside trials and clinics like Latitude. She gives cure odds that rise with time on dose, notes very rare epinephrine use, and says alpha-gal sugar allergy is the exception.
- •Maintenance of one to two peanuts daily is advised after therapy, and patients can go home on dosing once they reach the target
- •About 20% reach her definition of cure after two years and about 60% after five years
- •Epinephrine use during therapy is about 1 in 10,000 or rarer
- •Any protein allergy can be treated, but alpha-gal, a sugar allergy, probably cannot
- •Clinics outside trials now offer therapy, and she wants it accessible to all
- 1:26:22 – 1:28:04
Immunotherapy for Environmental Allergens like Cedar
Attia asks about cedar fever in Austin and why he cannot find immunotherapy. Nadeau says cedar immunotherapy exists and follows the same principle, describing proactive versus reactive therapy.
- •Attia cannot find an Austin provider offering cedar immunotherapy
- •Nadeau says it is possible but takes care to do
- •Immunotherapy is proactive therapy while antihistamines are reactive
- •She says both are needed
- 1:28:04 – 1:40:48
Air Pollution, PM2.5 and Protecting Yourself
Nadeau explains what PM2.5 is, its chemical content and its health harms, and how wildfire smoke adds to them. She covers monitors, masks, exercise limits, indoor air and MERV filters, and cites reports attributing 8 to 10 million deaths a year to air pollution.
- •PM2.5 is particulate matter of 2.5 microns that reaches the lungs and blood and carries about 200 chemicals
- •Wildfire smoke can be more potent because buildings and household products burn
- •Check AirNow, NOAA or PurpleAir, and wear a mask in poor air quality
- •Avoid exercising outdoors when the air quality index is above about 50
- •MERV 13 or higher filters help indoors, and gas or wood stoves can add pollutants
- •She cites a report of about 8 to 10 million deaths a year from air pollution, mostly cardiovascular and lung disease
- 1:40:48 – 1:46:12
Why the EpiPen Failed and Where to Find Treatment
Nadeau explains the EpiPen failure in her first patient: it was expired, the wrong weight dose, and the allergy had not been retested. They discuss EpiPen price hikes and alternatives, then Nadeau points listeners to clinicaltrials.gov and specialized clinics.
- •The family assumed the milk allergy was outgrown and never had IgE retested
- •The device was expired and the junior dose was wrong for his weight
- •Generic epinephrine devices, Auvi-Q and a possible nasal option now exist after the Mylan price controversy
- •Search clinicaltrials.gov under food allergy for nearby trials
- •Nadeau says there are about 17 companies in the space and more specialized clinics
