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Toxic molds, fossil fuels, antibiotics linked to chemical intolerance

Jun 07, 2023Jun 07, 2023

Shared by Will Sansom

Contact: Will Sansom, 210-567-2579, [email protected]

SAN ANTONIO (Aug. 25, 2023) — What initiates chemical intolerance (CI)? In a newly released survey of thousands of U.S. adults, respondents most frequently cited exposures to biological sources, such as mold and algae “blooms,” and/or fossil fuels, their combustion products and synthetic chemical derivatives such as pesticides, plastics and persistent organic pollutants.

Participants were queried about antibiotic use, as well. According to the results, prolonged courses of antibiotics were associated with an increased risk of CI.

The survey data, compiled by researchers from The University of Texas Health Science Center at San Antonio and published Aug. 14 in the journal Environmental Sciences Europe, also indicate that with each additional initiating exposure respondents can recall, the odds of their reporting CI nearly triple.


The study furthers understanding about how a two-stage disease process called TILT (toxicant-induced loss of tolerance) begins. The survey asked 10,981 people to state their self-perceptions about the events that began the downward spiral through TILT and into chemical intolerance.

“TILT can develop rapidly, for instance after a pesticide exposure, or gradually if someone is working or living in a setting such as a moldy building,” said study senior author Claudia S. Miller, MD, MS. Miller, the physician-researcher who first proposed TILT in 1996, is professor emerita of family and community medicine at the health science center (also called UT Health San Antonio).

Unknown origins

“Initiating events commonly go unrecognized and therefore unreported, leaving triggers and symptoms as the only documented components,” Miller said. “This has thwarted our understanding of the actual causes of TILT.”

Participants completed an 80-question online survey called the Personal Exposure Inventory. It included items concerning individuals’ medical diagnoses and personal exposures including antibiotic use.

Chemical intolerance was assessed using the Quick Environmental Exposure and Sensitivity Inventory (QEESI©) developed by Miller 25 years ago. It is a validated, self-administered questionnaire now used worldwide to differentiate individuals with CI from the general population. One-fifth of survey respondents met the QEESI criteria for chemical intolerance.

Toxic mold

Exposure to mold was cited by 17,5% of respondents meeting the criteria, making it the most frequently mentioned initiating event on the Personal Exposure Inventory. “In recent years, global warming has led to more rainfall, floods, hurricanes, roof leaks and water intrusion, resulting in increased mold growth indoors,” said biostatistician Raymond F. Palmer, PhD, co-author of the paper and professor of family and community medicine at UT Health San Antonio.

Mold was followed in rank order by exposures to pesticides (cited by 13.8% of respondents), medical/surgical procedures (12.6%), remodeling/new construction (12.0%), fires/combustion products (7.2%) and breast implants (1.8%).


Respondents answered questions pertaining to how many courses of antibiotics they had completed for specific types of infections. Antibiotics prescribed for infections categorized as skin, tonsil, gastrointestinal, prostate, sinus, wound and pneumonia were most strongly associated with chemical intolerance.

“Our search for the underlying causes of CI represents a much-needed addition to the CI/TILT literature, whose principal focus has been on triggers that elicit CI symptoms from day to day with no attempt to determine what initiated TILT,” Miller said.

‘A cohesive narrative’

“Taken together, our data support the idea that the person who reports multiple symptoms, multiple intolerances and recurrent infections as well as a history of exposure events is sharing a cohesive narrative, one that points to physiological (as opposed to psychosomatic) explanations of their oft-confusing complaints,” she said.

Although certain exposures such as medical/surgical procedures may be difficult to avoid, reducing exposures to contaminants related to pesticide use, new construction/remodeling and mold is possible and should be the focus of efforts to prevent future CI/TILT, the authors wrote.

Digging in

Finally, they encourage practitioners who see patients with medically unexplained symptoms — currently one in four primary care patients — to consider administering the QEESI.

“‘TILTed’ individuals who report brain fog, memory, mood and concentration difficulties often receive referrals to psychiatrists, psychologists or social workers who explore their psychosocial environments but do not ask about changes in their actual — physical and chemical — environments,” Miller said. “If initiating exposures such as pesticides, toxic mold, implants and combustion products are not stopped, sensitivities can spiral out of control.”

Teaching in schools of medicine, public health, architecture and engineering has not kept pace with these toxicants, many of which are new to the planet since World War ll, Miller noted. This is exacerbated by energy conservation efforts that have increased exposures to indoor air toxicants, she said.

Marilyn Brachman Hoffman

In their acknowledgments, the authors “thank the Marilyn Brachman Hoffman Foundation for generously funding this study and Marilyn Hoffman for her prescient bequest prioritizing research on toxicant-induced loss of tolerance. We are deeply grateful to the patients who participated in this groundbreaking study.”

Hoffman’s bequest specified research on TILT. “She suffered terribly from chemical, food and drug intolerances herself, but especially from not being believed by family members and her doctors,” Miller said. “She was a citizen-scientist who read all my papers and book, “Chemical Exposures: Low Levels and High Stakes,” co-authored with Nicholas Ashford, PhD, JD, of the Massachusetts Institute of Technology.

“More than anything, Mrs. Hoffman wanted to discover the biomechanism for TILT,” Miller said. “She knew that it was essential for helping patients like herself. Her bequest has led to publication of the biomechanism for TILT in a series of papers over the past two years in Environmental Sciences Europe, a journal read by regulatory toxicologists around the world.”

What Initiates Chemical Intolerance? Findings from a Large Population-Based Survey of U.S. Adults

Claudia S. Miller, Raymond F. Palmer, David Kattari, Shahir Masri, Nicholas A. Ashford, Rodolfo Rincon, Roger B. Perales, Carl Grimes, Dana R. Sundblad

First published: Aug. 14, 2023, Environmental Sciences Europe

Recent publications by the group in the same journal have more than 50,000 accesses, Miller said.

Masri, S.; Miller, C.S.; Palmer, R.F.; et al. Toxicant-induced loss of tolerance for chemicals, foods, and drugs: assessing patterns of exposure behind a global phenomenon. Environ Sci Eur 33, 65 (2021).

Miller, C.S.; Palmer, R.F.; Dempsey, T.T. Ashford, N. Mast cell activation may explain many cases of chemical intolerance. Environ Sci Eur 33, 129 (2021).

Palmer, R.F.; Rincon, R.; Perales, R.B.; Walker, T.T.; Jaén, C.R.; Miller, C.S. The Brief Environmental Exposure and Sensitivity Survey (BREESI): an international validation study. Environ Sci Eur 34, 32 (2022)

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TILTUnknown originsToxic moldAntibiotics‘A cohesive narrative’Digging inMarilyn Brachman HoffmanWhat Initiates Chemical Intolerance? Findings from a Large Population-Based Survey of U.S. AdultsShare This Article!