We know that heavy metals are naturally present in the environment, but modern industrial activity can increase human exposure through air, water, food, soil, dust, and certain workplaces.
This paper reviews how exposure to toxic metals—including lead, mercury, cadmium, arsenic, chromium, and aluminum—can affect human health. Its central message is that risk depends on the specific metal, the amount and duration of exposure, how exposure occurs, and whether the metal accumulates in the body over time
A key mechanism is oxidative stress: certain metals can disrupt the body’s antioxidant defenses, interfere with essential enzymes, and displace minerals such as calcium, copper, and iron from the proteins that normally use them. These disruptions can contribute to cellular damage involving lipids, proteins, and DNA
How heavy metals can trigger oxidative stress?
Under normal conditions, cells use oxygen to generate energy. During this process, small amounts of reactive oxygen species are naturally produced, including superoxide and hydrogen peroxide . Antioxidant systems, including glutathione, superoxide dismutase, catalase, and glutathione peroxidase, normally keep these molecules under control.
Certain metals can disrupt this balance by binding to sulfur-containing groups in proteins and glutathione, or by displacing essential metals such as iron and copper from proteins. The released iron or copper can then participate in the Fenton reaction, converting hydrogen peroxide into the highly reactive hydroxyl radical. The hydroxyl radical can react rapidly with nearby cellular components, including membrane lipids, proteins, and DNA. The result may be lipid peroxidation, impaired enzyme activity, DNA damage, inflammation, and altered cell signaling.
Heavy metals → weakened antioxidant defenses → excess reactive oxygen species → cellular damage
The review discusses potential effects across the nervous, cardiovascular, respiratory, gastrointestinal, kidney, reproductive, and immune systems, as well as associations with cancer risk for particular metals and exposure settings. Importantly, the authors emphasize that toxicity is not the same for every exposure: the chemical form of the metal, dose, route, timing, and duration all matter.
Takeaway: The evidence-based priority is to identify and reduce meaningful sources of exposure—especially contaminated water, food or soil, dust, and occupational sources,and seek qualified medical or public-health guidance when a significant exposure is suspected
Disclaimer: AI was used for editing and paragraphing.
Here is link to the study:
https://link.springer.com/article/10.1007/s00204-024-03903-2