Quick answer: Americans carry an average of 200+ synthetic chemicals in their bodies — a toxic burden that conventional medicine almost never measures or addresses. PFAS (“forever chemicals”) found in 98% of Americans’ blood streams, mercury from fish and dental amalgams, lead from decades of environmental exposure, and mycotoxins from water-damaged buildings collectively disrupt hormone signaling, impair thyroid and immune function, damage mitochondria, drive neuroinflammation, and increase cancer risk. Functional environmental medicine identifies individual toxin burdens through urine and blood testing and implements evidence-based detoxification — through liver Phase I/II support, sauna therapy, and targeted binding agents — to reduce the body burden of these unavoidable exposures.
Environmental toxicology has historically focused on occupational exposures — the high-level, acute poisonings that produce immediately recognizable disease. The emerging science of low-level chronic exposures — the kind virtually every American carries — is far less studied but increasingly linked to chronic disease epidemics including thyroid disorders, infertility, neurodevelopmental delays, autoimmune conditions, and metabolic syndrome. Functional environmental medicine bridges the gap between toxicological science and clinical practice.
PFAS: The Forever Chemicals and Their Health Consequences
Per- and polyfluoroalkyl substances (PFAS) — over 12,000 synthetic fluorinated compounds used since the 1940s in nonstick cookware, water-resistant clothing, food packaging, firefighting foam, and hundreds of industrial applications — earned their “forever chemical” designation because carbon-fluorine bonds are among the strongest in chemistry and resist biological and environmental degradation. PFAS accumulate in human tissue, particularly liver, kidney, thyroid, and immune cells, where they persist for years to decades (half-life of PFOS in humans: 4–8 years). The CDC’s 2019 National Health and Nutrition Examination Survey found PFAS detectable in 97–99% of Americans’ blood samples.
Health effects of PFAS: the International Agency for Research on Cancer (IARC) classified PFOA and PFOS as Group 1 carcinogens (kidney and testicular cancer) in 2023 — a milestone upgrade from Group 2B. Beyond cancer, PFAS disrupt thyroid hormone binding (competing with T4 for thyroid-binding globulin and transthyretin), drive immune system dysfunction (epidemiological studies show PFAS reduce vaccine antibody response in children), impair reproductive function (reducing AMH and sperm quality), increase total and LDL cholesterol (through impaired hepatic bile acid recycling), cause non-alcoholic fatty liver disease, and cross the placenta to affect fetal neurodevelopment. A 2023 meta-analysis in Environmental Health Perspectives found each doubling of PFAS exposure was associated with 20–30% increased thyroid cancer risk.
PFAS reduction and excretion: blood testing (PFAS panel measuring PFOA, PFOS, PFHxS, PFNA, PFDA, and total PFAS) quantifies burden. The primary route of elimination is fecal excretion via bile — supporting Phase II liver conjugation and interrupting enterohepatic recirculation with cholestyramine (a bile acid sequestrant with demonstrated PFAS binding ability) or food-grade activated charcoal is clinically used. Sweat is a significant PFAS excretion route — Genuis et al. (2012, ISRN Toxicology) demonstrated measurable PFAS in sweat including compounds not detectable in urine, supporting sauna therapy as a meaningful PFAS excretion strategy. Dietary reduction: avoid nonstick cookware (PTFE/Teflon), replace PFAS-contaminated drinking water with reverse osmosis filtration (removes >95% of PFAS), minimize fast food wrappers and microwave popcorn bags, choose PFAS-free clothing and outdoor gear.
Mercury: The Ubiquitous Neurotoxin
Mercury exists in three forms with distinct toxicology: elemental mercury (dental amalgams, liquid mercury), inorganic mercury compounds, and methylmercury (the organic form produced by bacteria methylating inorganic mercury in aquatic sediments, which bioaccumulates up the food chain — highest in large predatory fish: swordfish, shark, king mackerel, tuna, halibut). Methylmercury crosses the blood-brain barrier and placenta efficiently, where it disrupts neuronal migration, impairs tubulin polymerization critical for axon formation, inhibits the enzyme methionine synthase (impairing methylation), and generates reactive oxygen species that damage neuronal mitochondria. The Minamata disease epidemic — methylmercury industrial contamination in Japan’s Minamata Bay — documented severe neurological disease in affected individuals and their offspring who consumed contaminated fish.
At sub-clinical exposure levels relevant to the general population, methylmercury is associated with subtle cognitive impairment, mood disorders, peripheral neuropathy, immune dysregulation, and cardiovascular risk (mercury inhibits the antioxidant enzyme glutathione peroxidase in vascular endothelium). Dental amalgam fillings release elemental mercury vapor — particularly with hot food/drink consumption and chewing — that absorbs directly through the lung mucosa (80% bioavailable) to distribute to brain, kidney, and liver. The International Academy of Oral Medicine and Toxicology and the WHO both acknowledge dental amalgam as a significant mercury source, though debate continues about clinical significance at individual filling levels. Testing: whole blood mercury for recent methylmercury exposure; urine mercury (baseline and after DMSA challenge for body burden assessment); hair mercury as a long-term methylmercury biomarker. Treatment: sauna-enhanced sweating, modified citrus pectin, chlorella (proven mercury binder in animal studies), and — for significant body burden — supervised chelation with DMSA or DMPS.
Mold Illness and CIRS: Chronic Inflammatory Response Syndrome
Chronic Inflammatory Response Syndrome (CIRS) — the condition described by Dr. Ritchie Shoemaker — occurs in approximately 25% of the population who carry specific HLA-DR genetic variants that impair immune clearance of biotoxins, including mycotoxins from water-damaged buildings. In normal individuals, mycotoxins bind to pattern recognition receptors, trigger an immune response, get tagged by complement proteins for removal, and are cleared. In HLA-DR susceptible individuals, this clearance is impaired — mycotoxins and their immune complexes recirculate, triggering chronic complement activation, MMP-9 elevation, TGF-β upregulation, leptin dysregulation, and the multi-symptom, multi-system illness that characterizes CIRS.
CIRS symptoms overlap with fibromyalgia, chronic fatigue syndrome, lupus, and multiple sclerosis — explaining the diagnostic odyssey many CIRS patients endure. Key features: cognitive dysfunction disproportionate to age and education (“brain fog”), extreme fatigue, muscle pain and weakness, unusual sensitivity to light and pain, shortness of breath, unusual thirst with frequent urination, temperature dysregulation, and mood symptoms. Shoemaker’s Visual Contrast Sensitivity (VCS) test — a computerized vision test detecting neurological dysfunction from biotoxin exposure — is abnormal in approximately 92% of CIRS patients. Biomarker pattern: elevated MMP-9, elevated TGF-β1, elevated C4a (a complement split product), low MSH (melanocyte-stimulating hormone), low VIP (vasoactive intestinal peptide), and elevated leptin with leptin resistance. The Shoemaker protocol: removal from the biotoxin environment (the most critical step), cholestyramine or welchol to bind mycotoxins in the gut, followed by sequential treatment of the downstream inflammation and hormonal cascade.
Liver Phase I and Phase II Detoxification
The liver’s two-phase detoxification system is the primary mechanism for transforming fat-soluble toxins (which otherwise accumulate in adipose tissue and cannot be excreted) into water-soluble forms that can be excreted in urine or bile. Phase I (cytochrome P450 enzymes — primarily CYP1A1, CYP1A2, CYP3A4) oxidizes, reduces, or hydrolyzes toxins — converting them to intermediate metabolites that are often more reactive (and transiently more toxic) than the parent compound. Phase II conjugation enzymes then rapidly attach polar groups (glucuronide, sulfate, glutathione, glycine, acetyl, methyl) to these reactive intermediates, rendering them water-soluble for excretion.
The critical vulnerability is Phase I/II mismatch — when Phase I is induced (by alcohol, certain medications, or toxin exposures) without proportionate Phase II capacity, reactive intermediate metabolites accumulate and cause oxidative damage. This explains why N-acetylcysteine is the antidote to acetaminophen overdose (replenishes glutathione for Phase II conjugation when overwhelmed). Supporting Phase II: glutathione precursors (NAC, glycine, glutamate), sulfur-containing foods (cruciferous vegetables, garlic, onions providing sulfate conjugation substrates), B vitamins for methylation conjugation, and NRF2 activation through sulforaphane to upregulate Phase II enzyme expression. Genetic testing (CYP1A2, CYP3A4, COMT, GSTP1 polymorphisms) identifies individuals with impaired Phase I or II capacity who require particular attention to toxin reduction. The Organic Acids Test (OAT) provides functional markers of Phase II detoxification activity including glucarate/gluconate ratios and mercapturic acid levels.
Frequently Asked Questions About Functional Environmental Medicine
Does sauna therapy actually help with detoxification?
Yes, with growing evidence. Sweat is a genuine excretion pathway for heavy metals and some organic toxins. Genuis et al. published multiple papers (2011–2013, ISRN Toxicology, Archives of Environmental and Contamination Toxicology) demonstrating measurable arsenic, cadmium, lead, mercury, and BPA excretion in sweat, including compounds not detectable in urine of the same individuals. Finnish sauna use (80–100°C dry sauna, 15–20 minutes) and far-infrared sauna (lower temperature, deeper tissue penetration) both enhance sweating-mediated toxin excretion. The KIHD study (Finnish men) showed regular sauna use (4–7 sessions/week) was associated with significantly reduced cardiovascular mortality — benefits that may partially reflect toxin elimination. Sauna should always be accompanied by adequate hydration and electrolyte replacement to prevent dehydration-mediated reabsorption.
Should I be concerned about my dental amalgam fillings?
Dental amalgam is 50% mercury by weight and continuously releases low-level mercury vapor, particularly during chewing and when consuming hot foods. The debate is whether this low-level exposure causes clinical disease in the general population — the WHO and most conventional dental organizations say population-level health effects are minimal. However, for individuals with known mercury sensitivity, impaired detoxification genetics (GSTP1, MTHFR reducing methylation capacity), or documented high mercury body burden, amalgam removal by a mercury-safe dentist (using IAOMT protocols to minimize exposure during removal) combined with detoxification support is a reasonable clinical consideration. Testing body mercury burden before and after removal documents whether amalgams are a primary mercury source in your specific case.
How do I know if I have been exposed to mold and if CIRS might apply to me?
The primary clue is a symptom complex that is chronic, multi-system, progressive within water-damaged buildings, and improved when away from the exposure environment for weeks. The VCS test (freely available at survivingmold.com) screens for neurological biotoxin effects with 92% sensitivity in CIRS patients. ERMI (Environmental Relative Moldiness Index) testing of your home/workplace using an EPA-validated methodology identifies actionable mold presence. HLA-DR typing (blood test) identifies genetic susceptibility. If VCS is abnormal and ERMI is elevated, the Shoemaker biomarker panel (MMP-9, TGF-β1, C4a, MSH, VIP, leptin) provides confirmatory data. Most importantly: if symptoms resolve when away from a building for 1+ weeks and return upon re-entry, the building is almost certainly the cause regardless of testing.
What are the most important dietary changes for reducing toxic body burden?
Dietary modifications with the greatest toxin-reduction impact: switch to reverse osmosis filtered water (removes heavy metals, PFAS, chlorine, chloramine); choose organic produce for the Environmental Working Group’s “Dirty Dozen” list (highest pesticide burden: strawberries, spinach, kale, peaches, pears, apples); eliminate large predatory fish (swordfish, shark, king mackerel, tilefish) to reduce methylmercury; use glass, stainless steel, or ceramic food storage instead of plastic (reducing BPA, phthalate, and microplastic exposure); eliminate nonstick cookware; choose clean-label personal care products (Environmental Working Group’s Skin Deep database rates ingredient safety); and eat adequate fiber (20–35g/day) to ensure regular bowel movements — constipation dramatically reduces toxin excretion and increases enterohepatic recirculation. If you are concerned about your environmental toxin burden and its potential role in your health conditions, call The Private Practice at (810) 206-1402 to schedule your functional environmental medicine evaluation.