Many conversations about oxidative stress focus on a single cause — perhaps too much sugar, not enough antioxidants, or too much sun. But in real life, oxidative stress accumulates from many sources. A person might be exposed to vehicle exhaust on their commute, spend hours around chemical fumes at work, and enjoy a drink or two in the evening. Each of these exposures contributes to the cumulative burden on our mitochondria.
This post explores three common sources of oxidative stress: alcohol use, air pollution from traffic, and occupational exposure to volatile organic compounds (VOCs). Understanding these exposures at the cellular level can help your healthcare provider interpret your symptoms in context.
What Is Oxidative Stress — and Why Are Mitochondria So Vulnerable?
Oxidative stress occurs when the balance between reactive oxygen species (ROS) — unstable molecules that can damage cells — and the antioxidant defenses that neutralize them tips out of balance. Some ROS production is normal and even useful; the problem arises when production outpaces the body’s capacity to manage it.
One reason that mitochondria are particularly vulnerable to oxidative damage is because they are themselves a major source of ROS (produced as a byproduct of normal energy metabolism), so if the antioxidant systems are overwhelmed by exogenous sources, the ROS produced by mitochondria will accumulate in their vicinity. Mitochondrial DNA (mtDNA) is especially susceptible to damage because it lacks the protective proteins that shield the DNA in the cell nucleus. When mtDNA is damaged or when mitochondrial membranes are disrupted by oxidative stress, the result is impaired ATP production — meaning less energy available to every cell in the body.
Alcohol Use and Oxidative Stress
A systematic review and meta-analysis by Viola et al. (2023) examined the relationship between alcohol use and oxidative stress markers across multiple studies. Alcohol users showed higher levels of oxidative stress than users of other substances who participated in these studies.
The metabolism of alcohol produces hydrogen peroxide and superoxide — both ROS (reactive oxygen species) — as byproducts. At the same time, alcohol metabolism depletes antioxidant defenses. The review found lower levels of superoxide dismutase (an antioxidant enzyme) and higher levels of damaging free radicals, including hydroxyl and hydroperoxyl radicals, which are particularly damaging to lipids.
Several markers of oxidative damage — malondialdehyde, thiobarbituric acid reactive substances (TBARS), and lipid peroxidation — were found to increase with the amount of alcohol consumed, while total antioxidant capacity was lower. Importantly, when chronic users abstained, their oxidative stress markers improved — and lifetime duration of use did not predict current oxidative stress levels, suggesting that reducing or stopping alcohol use can produce measurable clinical benefits regardless of how long someone has been drinking.
The Red Blood Cell Story
A separate systematic review by Mi et al.(2022) adds an interesting layer of complexity to how we interpret oxidative stress lab markers in the context of alcohol use. In alcohol-dependent males, superoxide dismutase and glutathione peroxidase — two important antioxidant enzymes — were found to be lower when measured in red blood cells (erythrocytes) and higher when measured in serum or plasma at the same time.
The authors suggest a compelling explanation: the elevated serum levels may not reflect higher antioxidant activity, but rather the release of cellular contents from damaged red blood cells that have ruptured. Lipid peroxidation from oxidative stress would have damaged the cell membranes, causing them to break open and spill their contents — including antioxidant enzymes — into the surrounding fluid.
Catalase (an antioxidant enzyme) is used up in metabolizing alcohol to acetaldehyde; its depletion makes it unavailable to protect the mitochondria from oxidative stress that would damage their membranes via lipid peroxidation. Glutathione, another antioxidant that normally provides protection, is depleted in the metabolism of acetaldehyde. Additionally, acetaldehyde can bond to membrane lipids and oxidize them directly. The authors suggest that measuring the difference between erythrocyte and serum levels of superoxide dismutase and glutathione preoxidase could be a useful clinical tool for assessing the degree of red blood cell membrane damage — information that could help guide treatment and help stave off the cognitive impairment and other serious complications associated with chronic heavy alcohol use.
Air Pollution and Mitochondrial DNA Damage
Breton et al. (2019) investigated the impact of air pollution from Los Angeles freeway traffic on mitochondrial function via reactive oxygen species damaging mitochondrial DNA. They looked at cell cultures, animal models, and human cord blood samples — each of which pointed to evidence of mitochondrial dysfunction.
First, they collected samples of vehicle emissions from the air near the freeway. Cells exposed to these samples for 24 hours showed oxidation of mitochondrial DNA. Mitochondria in the exposed cells consumed less oxygen and had fewer copies of mitochondrial DNA per cell, both indicators of impaired mitochondrial function.
Second, male rats were exposed to the same pollution samples at a concentration per kg body weight similar to human exposure in Los Angeles, for a duration of their lifespan proportional to approximately one month of a human’s life. Their liver cells showed the same reduction in mitochondrial DNA copies and mitochondrial oxygen consumption.
Third, the researchers looked at BaP-tetrol levels in cord blood donated by 82 human volunteers who had given birth in Los Angeles. BaP-tetrol is a derivative of benzo(a)pyrene (BaP) — a polycyclic aromatic hydrocarbon formed by incomplete combustion in gasoline engines. Cord blood samples with higher levels of BaP-tetrol had significantly fewer mitochondrial DNA copies per cell. Despite this finding, an association was not seen with estimates of each mother’s traffic pollution exposure based on her neighborhood, accounting for wind direction and nearby road traffic, suggesting there were factors affecting exposure beyond neighborhood air pollution levels.
The convergence of findings across three different experimental systems — in vitro, animal, and human — strengthens the case that traffic-related air pollution can directly impair mitochondrial function through oxidative damage to mitochondrial DNA. For people who live or work near freeways, this is a real risk factor for health.
VOC Exposure in Nail Salons
Nail salon workers represent a population with significant occupational exposure to volatile organic compounds (VOCs) — chemicals found in nail polish, polish remover, adhesives, and other salon products. A pilot study by Zhong et al. (2019) conducted in Michigan examined VOC sources and exposure levels in nail salons, and found that VOC levels were higher near nail technicians than on the other side of the room. The authors note that ventilation improvements could mitigate this, but that it can be difficult for workers to advocate for better ventilation conditions, and that improving ventilation can be technically and logistically challenging even when a salon owner is motivated to do so.
Some factors may be more within reach. Keeping trash cans closed — so that disposed of products continue to off-gas into a contained space rather than into the room — is a simple and effective way to reduce ambient VOC levels. Running a fan as much as possible can help disperse VOCs away from the immediate work area. And when ventilation improvements are possible, they should be prioritized.
Addressing the Total Burden
When looking at the combination of these exposures we can note that they all act through the same mechanisms — depleting antioxidant capacity, generating reactive oxygen species, and stressing mitochondrial function. In functional medicine, we think about this as total burden: no single exposure may be sufficient to cause symptoms on its own, but the cumulative load can tip the balance.
This is where diet and lifestyle become powerful levers. Some practical areas to consider:
Reduce alcohol intake where possible. Given the direct production of hydrogen peroxide and superoxide during alcohol metabolism, and the depletion of glutathione and catalase that follows, reducing alcohol consumption is one of the most direct ways to lower oxidative stress burden. The research suggests that even periods of abstinence can produce measurable improvement in oxidative stress markers.
Prioritize antioxidant-rich foods. The antioxidant enzymes most affected by these exposures — superoxide dismutase, glutathione peroxidase, and catalase — depend on micronutrient cofactors including zinc, copper, manganese, and selenium. Foods rich in these minerals — seafood, nuts and seeds, legumes, whole grains, and leafy greens — support the body’s antioxidant defenses. A diet high in colorful vegetables and fruits provides additional phytonutrient antioxidants that help reduce the overall ROS burden.
Avoid refined sugars and processed foods. These contribute to oxidative stress and inflammation, adding to the total burden on mitochondria.
Support mitochondrial function through movement. Resistance training has been shown to alter mitochondrial function in skeletal muscle in ways that increase the capacity for ATP production (Porter et al., 2015). Regular physical activity is one of the most evidence-supported strategies for maintaining mitochondrial health.
Minimize additional environmental exposures where possible. For those with significant occupational or environmental exposures, reducing controllable sources — alcohol, processed foods, other chemical exposures — becomes even more important as a way of managing total oxidative burden.
The Bigger Picture
Oxidative stress and mitochondrial dysfunction are not conditions that arise from a single cause or resolve with a single intervention. They are the result of accumulated exposures, dietary patterns, and lifestyle factors acting together over time. Understanding the mechanisms — how alcohol metabolism generates ROS, how air pollution damages mitochondrial DNA, how workplace chemicals add to the burden — is the first step toward making meaningful changes.
If you have been experiencing unexplained fatigue, brain fog, or other symptoms that suggest your energy production may be compromised, it is worth discussing your full exposure history with a functional medicine practitioner who can help you evaluate the contributing factors and prioritize where to focus.
References
Breton, C. V., Song, A. Y., Xiao, J., Kim, S.-J., Mehta, H. H., Wan, J., Yen, K., Sioutas, C., Lurmann, F., Xue, S., Morgan, T. E., Zhang, J., & Cohen, P. (2019). Effects of air pollution on mitochondrial function, mitochondrial DNA methylation, and mitochondrial peptide expression. Mitochondrion, 46, 22–29. https://doi.org/10.1016/j.mito.2018.02.003
Mi, Y., Zhou, X., Tan, X., et al. (2022). The status of oxidative stress in patients with alcohol dependence: A meta-analysis. Antioxidants, 11(10), 1919. https://doi.org/10.3390/antiox11101919
Porter, C., Reidy, P. T., Bhattarai, N., Sidossis, L. S., & Rasmussen, B. B. (2015). Resistance exercise training alters mitochondrial function in human skeletal muscle. Medicine & Science in Sports & Exercise, 47(9), 1922–1931. https://doi.org/10.1249/mss.0000000000000605
Viola, T. W., Orso, R., Florian, L. F., Garcia, M. G., Gomes, M. G. S., Mardini, E. M., Niederauer, J. P. O., Zaparte, A., & Grassi, O. R. (2023). Effects of substance use disorder on oxidative and antioxidative stress markers: A systematic review and meta-analysis. Addiction Biology, 28(1), 1–14. https://doi.org/10.1111/adb.13252
Zhong, L., Batterman, S., & Milando, C. W. (2019). VOC sources and exposures in nail salons: A pilot study in Michigan, USA. International Archives of Occupational and Environmental Health, 92(1), 141–153. https://doi.org/10.1007/s00420-018-1353-0
The content of this blog is for educational purposes and is not intended as medical advice. Please work with a qualified healthcare provider for personalized guidance.
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