Nutrigenomics

by | May 31, 2026 | Detox & Liver Support

Genes That Control Your Chemical Sensitivity

Several genes have been implicated in chemical sensitivity through their roles in detoxification, inflammation, and metabolic processes

Each person has unique genetic variants that can alter their ability to process and utilize nutrients. This variability means that nutritional needs can differ widely among individuals, depending on their genetic makeup. For example, some people may have genetic variants that affect how they metabolise caffeine, folate, or fats.

These genes encode the enzymes that neutralize environmental toxins, heavy metals, and chemical byproducts. Variants in any of them reduce efficiency.

CYP450 Genes (Cytochrome P450 Enzymes): This family of genes is crucial for the metabolism of many environmental chemicals and drugs. Variations in these genes can affect how efficiently the liver processes toxins, potentially impacting sensitivity.

GST Genes (Glutathione S-transferases): These genes are involved in detoxification processes. Polymorphisms in GST genes can influence an individual’s ability to clear harmful substances from the body.

Glutathione S-Transferase M1

PHASE II DETOXIFICATION ENGINE

GSTM1 is one of your body’s primary detoxification enzymes. It works by conjugating toxins with glutathione, a molecule that makes poisons water-soluble so your kidneys and liver can eliminate them. Without GSTM1, large classes of environmental chemicals get stuck in your tissues longer.

 GSTM1 null genotype, meaning the gene is completely deleted with zero copies of enzyme. You cannot clear entire categories of environmental toxins efficiently, no matter how hard you try. 

The result: after exposure to pesticides, cleaning products, petroleum, perfume you don’t recover as quickly. Your headaches last longer, fatigue goes deeper the toxins are accumulating in your tissues rather than being cleared.

Glutathione S-Transferase Pi

OXIDATIVE STRESS CLEANUP

GSTP1 is a second phase II detox enzyme, focused on clearing oxidative stress byproducts and reactive oxygen species generated by your mitochondria and by exposure to pollutants. It’s especially critical when exposed to heavy metals, persistent organic pollutants, or chemicals. 

Methylenetetrahydrofolate Reductase

METHYLATION AND HEAVY METAL DETOX

MTHFR is the enzyme that activates folate into its bioactive form, which then drives methylation throughout your body. One of methylation’s critical jobs is producing glutathione, your master antioxidant and phase II detox cofactor. MTHFR also supports the production of SAM-e, which drives heavy metal binding and elimination.

The C677T variant, reduces MTHFR enzyme activity by 35-40%. If you carry this variant, you produce less glutathione and less SAM-e, which means you have less raw material for heavy metal detoxification and oxidative stress management. This bottleneck cascades into every detox pathway downstream.

You feel this as compounding fatigue after chemical exposure, persistent heavy metal toxicity symptoms (brain fog, tremors, numbness) that don’t respond to general detox, and slow recovery from multiple simultaneous exposures.

Superoxide Dismutase 2

MITOCHONDRIAL ANTIOXIDANT DEFENSE

SOD2 is the primary antioxidant enzyme inside your mitochondria. Every toxin your cells try to process generates free radicals. SOD2 neutralizes them before they damage your mitochondrial DNA. Without sufficient SOD2 activity, mitochondrial damage faster. 

The Val16Ala variant, present in roughly 40% of people reduces SOD2 protein efficiency. People carrying the Ala allele accumulate oxidative damage inside their mitochondria faster, especially when exposed to environmental toxins, heavy metals, or air pollution

N-acetyltransferases (NATs): NAT genes are involved in the metabolism of certain drugs and toxins. Variants in these genes can affect the rate at which an individual processes certain chemicals.

Anti-inflammatory genes: Genes that regulate inflammatory responses, such as those involved in the production of cytokines (e.g., IL-6, TNF-alpha), may influence individual susceptibility to chemical exposure.

Histamine metabolism genes: Variants in genes controlling histamine metabolism (e.g., DAO gene) may also play a role, as some individuals with chemical sensitivity report heightened sensitivity to histamine and related compounds

Lifecode GX, genetic testing companies, typically offers insights into various health traits, including liver detoxification. These tests often analyze specific genes associated with metabolic processes in the liver, including those involved in detoxification pathways.

Liver Detoxification Testing:

Genetic Markers: 

    • CYP450 enzymes: These play a critical role in drug metabolism and the detoxification of various compounds.
    • GST (Glutathione S-transferases): These enzymes help in the conjugation process, making harmful substances more water-soluble for excretion.

    • SOD (Superoxide dismutase): This enzyme is involved in the antioxidant defense, combating oxidative stress.
    • MTHFR (Methylenetetrahydrofolate reductase): This gene is involved in folate metabolism and may affect the body’s ability to handle certain toxins.
    • Test results can provide insights into how effectively an individual may detoxify substances, influencing dietary and lifestyle choices.
    • Individuals with certain genetic variants may require specific nutrients to support their detoxification processes.
    • Those with impaired detoxification pathways might be recommended to avoid certain exposures or optimize their diets to support liver health.
    • Increased intake of cruciferous vegetables (like broccoli and Brussels sprouts) which are known to support liver detoxification.
    • Appropriate supplementation of antioxidants or nutrients that support the detox pathways, such as glutathione, folate, and vitamins C and E. 
    • Partnering with a registered nutritionist can significantly enhance your understanding of how your genetic makeup affects your nutrition and overall health.
    • Together, we can create a comprehensive plan that aligns with your unique genetic profile, helping you make informed choices to improve your health and well-being effectively. Your journey towards health can be empowered with the right knowledge and support!