Your Liver Enzymes Are Slightly High, Yet Nothing Explains Why.

GSTM1 encodes glutathione S-transferase M1, an enzyme that works in phase II detoxification. Its job is straightforward: grab environmental toxins and heavy metals that have already been partially processed by phase I enzymes, attach them to glutathione molecules, and send them toward elimination. This is how your liver neutralizes pesticides, petrochemicals, polycyclic aromatic hydrocarbons, and dozens of other environmental exposures that arrive in your body daily.

Here’s the critical problem: roughly 50 percent of the population carries a GSTM1 null genotype, meaning the gene is completely deleted. No gene means no enzyme. People with GSTM1 null have virtually no capacity to conjugate and eliminate this entire class of environmental toxins and heavy metals. They don’t have reduced enzyme activity. They have zero enzyme activity for this detoxification step.

What does that feel like? Your liver works twice as hard to clear the same toxic load. Pesticide residues, air pollutants, and heavy metals linger in your system longer. Your detoxification burden climbs. Your liver enzymes rise as your hepatocytes strain under the workload. You feel sluggish, your inflammation markers climb, and your doctor sees the elevated enzymes but has no explanation because they didn’t test GSTM1 status.

CYP2E1 is a phase I cytochrome P450 enzyme with a specific job: metabolize alcohol and acetaldehyde, the toxic intermediate produced when your body breaks down ethanol. It also handles volatile organic compounds like benzene and acetone. If you drink alcohol, your liver uses CYP2E1 to prevent acetaldehyde from accumulating and causing oxidative damage. The enzyme generates reactive oxygen species in the process, which is why it’s paired with strong antioxidant systems.

Variants in CYP2E1 can shift your enzyme activity up or down. Higher activity variants burn through alcohol faster but generate more oxidative stress in the mitochondria. Even if you don’t drink alcohol, CYP2E1 processes aldehydes from smoking, air pollution, and endogenous metabolic byproducts; if your variant is overactive, you’re generating excessive free radical damage in your liver cells every single day. That oxidative stress shows up as elevated liver enzymes because your hepatocytes are under chronic inflammatory pressure.

What does this mean practically? Your liver is working harder than it should be to clear a metabolic load you may not even realize you’re creating. Secondhand smoke, traffic pollution, and even stress-induced metabolic byproducts trigger your CYP2E1. If you carry a higher activity variant, your mitochondria are flooded with reactive oxygen species. Your antioxidant defenses struggle to keep up. Your liver enzymes climb as proof.

MTHFR encodes methylenetetrahydrofolate reductase, which catalyzes a critical step in the methylation cycle. That cycle produces SAM (S-adenosyl methionine), the body’s universal methyl donor. More importantly, it also drives the production of glutathione, the master antioxidant and primary heavy metal chelator. If MTHFR is working at reduced efficiency, your methylation cycle slows, your glutathione production drops, and your heavy metal clearance capacity collapses.

The C677T variant, carried by roughly 40 percent of people of European ancestry, reduces MTHFR enzyme activity by 35 to 40 percent. Homozygous carriers have even more dramatic reductions. With reduced MTHFR activity, your cells cannot generate sufficient glutathione, which means your liver loses the primary molecule it uses to neutralize oxidative stress and clear heavy metals. Metals accumulate. Oxidative stress rises. Your liver enzymes climb because your hepatocytes are drowning in unbound toxins they cannot eliminate.

Here’s what you experience: fatigue that doesn’t respond to sleep, brain fog even on good days, and unexplained inflammation. Your liver enzymes climb because your mitochondria are stressed. Standard advice to take folic acid makes the problem worse because MTHFR cannot convert synthetic folic acid efficiently. You need methylated folate, but nobody tested MTHFR to know that.

SOD2 encodes superoxide dismutase 2, the primary antioxidant enzyme located inside your mitochondria. Mitochondria generate energy as ATP, but that process generates reactive oxygen species as a byproduct. SOD2 converts those toxic superoxide radicals into hydrogen peroxide, which catalase then neutralizes into water and oxygen. Without SOD2 working efficiently, superoxide accumulates inside the mitochondria. That triggers mitochondrial damage, DNA fragmentation, and cell death. Your liver is especially sensitive to mitochondrial damage because hepatocytes are packed with mitochondria and work constantly to generate the ATP needed for detoxification.

The Val16Ala variant, present in roughly 40 percent of people of European ancestry as homozygous carriers, reduces SOD2 enzyme activity. People with the Ala variant accumulate mitochondrial superoxide faster than people with the Val variant, which means their liver cells suffer chronic oxidative damage every time they process a toxin. Each detoxification event generates reactive oxygen species. With reduced SOD2, those species linger, damage mitochondrial DNA, and trigger inflammation. Your liver compensates by producing more detoxification enzymes. Those enzymes show up in your bloodwork as elevated ALT and AST.

What does this feel like? Energy crashes despite sleep, persistent low-grade inflammation, and recovery problems after exercise. Your liver is exhausted because your mitochondria are exhausted. Standard supplements like acetaminophen are catastrophic for you because they generate additional oxidative stress that your SOD2 cannot handle.

ALDH2 encodes aldehyde dehydrogenase 2, an enzyme that neutralizes acetaldehyde, the toxic intermediate produced when your liver breaks down ethanol. Acetaldehyde is far more damaging than alcohol itself. It damages DNA, impairs mitochondrial function, and triggers inflammation. ALDH2 is the primary defense against acetaldehyde accumulation. It converts acetaldehyde into acetic acid, which is harmless.

The *2 allele, the Glu487Lys variant, severely impairs ALDH2 enzyme activity. It’s present in roughly 35 to 40 percent of East Asian populations but rare in people of European ancestry. People carrying the *2 allele cannot clear acetaldehyde efficiently; toxic aldehydes accumulate in their liver cells, trigger mitochondrial damage, and cause persistent inflammation even if they never drink alcohol. Why? Because acetaldehyde is also produced from smoking, air pollution, industrial chemical exposure, and endogenous metabolic byproducts. You don’t need to drink to accumulate it.

If you carry the *2 allele and live in an urban area or have occupational chemical exposure, your liver is constantly flooded with aldehydes it cannot clear. Your hepatocytes are under chronic oxidative stress. Your detoxification capacity is hijacked. Your liver enzymes climb because your cells are sending distress signals. You feel inflammation, brain fog, and exhaustion that don’t match your lifestyle.

TNF encodes tumor necrosis factor, a pro-inflammatory cytokine that coordinates your immune response to threats: pathogens, toxins, and cellular damage. When you encounter a toxin, TNF is released. It signals immune cells to mobilize, triggers inflammation, and helps clear the threat. This is normal and protective. But in people with certain TNF variants, this response runs too hot. They produce excessive TNF in response to the same exposures that barely activate others’ immune systems.

The -308G>A variant, present in roughly 30 percent of the population, increases TNF production in response to environmental challenges. People carrying the A allele mount a more aggressive inflammatory response to mold spores, environmental chemicals, heavy metals, and other exposures; their liver enzymes can climb not because toxins are accumulating, but because their immune system is flooding their liver with inflammatory signals that damage hepatocytes. It’s not toxin accumulation. It’s immune overreaction.

Here’s what this means: you might actually be exposed to relatively normal levels of toxins or allergens, but your immune system treats them like a crisis. Your liver gets caught in the crossfire. Cytokine signaling drives inflammation. Your hepatocytes suffer collateral damage. Your enzymes rise. You feel persistent fatigue, brain fog, and joint aches because your baseline inflammation is chronically elevated. Standard detox advice doesn’t help because the problem isn’t toxin load. It’s immune dysregulation.