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Heavy metals have been a hot topic in health and wellness conversations, with lots of talk focusing on the dangers of them building up in the body and the need to detox. While it’s true that high levels of heavy metals can have health consequences, the topic is more complex than many headlines and social media posts suggest. For most people, everyday exposures at low doses are not necessarily something to panic about and rush to detox from.
Heavy metals are naturally occurring elements found in soil, water, air, and rocks. Most of us are exposed to small amounts through everyday life. This can occur through the food we eat, the water we drink, the air we breathe, and the environment around us.
Not all metals are bad for you. Your body needs small amounts of certain metals, including zinc, copper, iron, and manganese, to support important functions like immune health, metabolism, and energy production. But others, such as lead, mercury, cadmium, and arsenic, do not serve a known beneficial role in the body, and can become harmful at high levels of exposure.
It’s also important to remember that our bodies have the ability to naturally process and eliminate many substances, which can include some small amounts of certain heavy metals. So heavy metals aren’t automatically harmful simply because they exist. It’s the level of exposure, route of exposure, duration of exposure, and individual risk factors that matter.
How heavy metals can enter the body
Heavy metals enter the body through three primary methods:
Through the gastrointestinal tract:
Because heavy metals are present in soil, water, and air, they can infiltrate the foods that we eat. Most foods contain only trace amounts, but some tend to contain higher levels than others.
- Rice absorbs more arsenic from water and soil than most foods, particularly brown rice.
- Larger predatory varieties of fish, like king mackerel, tuna, and marlin can be higher in mercury.
- Trace amounts of cadmium can be present in a variety of foods, including grains, potatoes, rice, and leafy vegetables. The health significance depends on the amount and frequency of exposure.
- Some spices, like thyme, oregano, ginger, paprika, and turmeric can contain arsenic, cadmium, and lead.
Via the skin
Your skin acts as a protective barrier, but in some situations, it can absorb contaminants like heavy metals, particularly with repeated exposure or certain products. Examples include:
- Direct contact with contaminated soil, industrial chemicals, polluted water
- Certain tattoo inks
- Imported cosmetics and personal care products with weaker regulations
- Some inexpensive metal jewelry, particularly children's jewelry or charms
By being inhaled
In some situations, the air we breathe can contain heavy metals in the form of dust, smoke, or tiny airborne particles. This is more likely to happen during certain environmental events or occupational exposures.
- Wildfire and structural fire smoke can contain heavy metals like lead and cadmium, which become airborne as materials burn
- Lead paint in older homes (often built before 1978) can flake off and create dust that can be inhaled
- People who work in mining, welding, battery manufacturing, metal recycling, or construction may inhale dust or fumes containing heavy metals if proper safety precautions aren't in place.
- Certain hobbies, such as using indoor shooting ranges, making stained glass, working with ceramics or ceramic glazes, and metalworking, may also increase exposure to heavy metals through dust or fumes.
Why the body can be sensitive to heavy metals
A single heavy metal exposure doesn't automatically cause harm. In most cases, health concerns arise when exposure is high enough or happens repeatedly over time. This could also occur after a high level of exposure over a short period, such as during an occupational accident or while sanding lead-based paint without proper protective gear. But for most people, concerns are more likely to stem from repeated exposure over time.This process is often referred to as bioaccumulation and occurs when certain heavy metals enter the body faster than they can be eliminated. As they build up in the body, heavy metals may settle in soft tissues, organs, and bones, where they can interfere with normal biological processes. Depending on the type of metal and the level of exposure, this may increase oxidative stress, disrupt enzymes that help cells function normally, interfere with nerve signaling, and place strain on organs like the liver and kidneys that help process and eliminate substances from the body. Exactly how heavy metals affect the body varies from person to person and depends on the type of metal, the amount of exposure, how long the exposure lasts, and an individual's overall health.
The brain and nervous system
At significant exposures or after prolonged exposure, some heavy metals including lead, mercury, arsenic, and cadmium, may impact the nervous system. Scientists believe this may happen because these metals can interfere with normal nerve signaling, increase oxidative stress, and disrupt other biological processes that help nerve cells function properly. Potential symptoms may include:
- Changes in cognition: Elevated levels of certain heavy metals, such as lead, particularly during early childhood, have been linked to reduced cognitive function.
- Numbness or tingling: Higher body levels of certain heavy metals, like lead, mercury, arsenic, and thallium, have been linked to neuropathy (nerve damage), which can cause numbness or tingling in the hands and feet.
- Headaches: Overexposure to metals such as arsenic has been associated with headaches, drowsiness, confusion, and in more severe cases, seizures.
- Mood changes: Some studies suggest that elevated exposure to certain heavy metals may be associated with mood changes, including anxiety and depression.
- Fatigue: Feeling unusually tired or having low energy has also been reported in people with elevated levels of certain heavy metals.
While these symptoms can occur with heavy metal exposure, they are nonspecific and can have many other causes, including chronic stress, autoimmune conditions, sleep deprivation, thyroid issues, or nutrient deficiencies. And some people with heavy metal exposure have no noticeable symptoms at all.
Those looking to learn more about their brain health may also benefit from Prenuvo's Advanced Brain Health Scan, which helps provide MRI-based information about brain structure and volume. In addition to providing a snapshot of your current brain health, the scan can help establish a baseline to monitor changes over time. While it isn't a test for heavy metal exposure, it can offer valuable context about overall brain health.
The kidneys, liver, and general organ health
The liver and kidneys are two of the body’s hardworking organs, as they serve as the primary processing, filtering, and elimination systems. The liver helps process nutrients, medications, and other substances, while the kidneys filter waste products and excess fluids from the blood so they can be eliminated from the body. Since these organs play these crucial roles, they can be among the areas of the body most affected by elevated heavy metal exposure.
Cadmium, for example, primarily accumulates in the kidneys where it can remain for decades. Over time, elevated exposure has been linked to oxidative stress and kidney damage that may impair the kidneys' ability to filter waste. Some studies have found that heavy metals, including cadmium, lead, mercury, and arsenic, have been associated with liver damage after long-term or high levels of exposure.
Low-level or chronic exposure may not cause noticeable symptoms, and liver or kidney abnormalities can have many possible causes. When clinically indicated, laboratory testing can help assess organ function and determine whether further evaluation is needed. That’s where checking in on your liver and kidney function can help. Prenuvo’s advanced blood panels test biomarkers for liver, kidney, and metabolic health, helping to assess how well your liver and kidneys are functioning. And a Whole Body Scan with Body Composition Analysis can help provide information about the structure of these organs, as well as additional context around visceral fat, muscle mass, and abdominal organ measurements. These imaging tests are not used to diagnose heavy-metal toxicity or determine whether symptoms are caused by an exposure. They may provide separate information about overall anatomy or function when clinically appropriate.
Cardiovascular and metabolic health
This is another area of the body that can be impacted by environmental exposures. Researchers continue to study how exposures to things like heavy metals may influence cardiovascular, metabolic, and inflammatory health. Research is still ongoing but studies have found associations between long-term exposure to certain heavy metals, like arsenic, lead, cadmium, and mercury and an increased risk of conditions such as high blood pressure, cardiovascular disease, and type 2 diabetes.
According to the American Heart Association, long-term exposure to metals such as lead, cadmium, and arsenic has been associated with an increased risk of cardiovascular conditions, including coronary artery disease, stroke, peripheral artery disease, and high blood pressure. Scientists are still studying the mechanisms behind this but believe that chronic heavy metal exposure may increase oxidative stress, promote inflammation, and affect blood vessel function.
Metals have been studied for potentially affecting metabolic health, including blood sugar regulation and insulin resistance. Some studies, for instance, have found that people with a higher exposure to certain heavy metals may have a higher risk of developing diabetes. The evidence in this department is still evolving, as researchers continue to investigate how these exposures may influence metabolic health over time.
For those interested in learning more about their cardiovascular health, Prenuvo's Advanced Heart Health Scan helps provide MRI-based insights into heart structure and function, including myocardial strain, MyoHealth Scores, and estimated ejection fraction. While this test doesn’t detect heavy metal exposure, it can provide valuable information about overall heart health and help establish a baseline for monitoring changes over time.
Why symptoms alone are not enough
While heavy metal exposure can cause symptoms if levels accumulate high enough in the body, you can have levels building up without feeling the physical effects. And if you do feel symptoms, many signs of heavy metal exposure can mimic symptoms of other conditions. Fatigue, headaches, brain fog, mood changes, or tingling can have many causes, including stress, injuries, sleep apnea, depression, and dehydration. Thus, it can be difficult to determine whether symptoms are in fact due to heavy metal exposure without further evaluation.
Since symptoms alone can't determine whether heavy metal exposure is present, blood testing can provide more objective information by measuring levels of specific metals in the body. The results should then be discussed with a healthcare provider who can provide context on if your levels are within a healthy range and how to lower them if they are elevated.
What blood testing can and cannot tell you
Blood testing measures the levels of specific metals, such as arsenic, lead, cadmium, tin, and mercury, in your blood. But it’s not a reliable test for some metals, like barium, nickel, and uranium. Depending on the metal being tested, the results can help you to identify if you have elevated levels and provide information about current or recent exposure. A Prenuvo Heavy Metals Panel can also guide conversations with your healthcare provider about whether additional evaluation, treatment, or follow-up is needed.
While blood tests can provide valuable information about heavy metal exposure, they can't explain every symptom, diagnose every exposure-related condition on their own, or replace a comprehensive medical evaluation. It's also important to note that some heavy metals leave the bloodstream over time and are stored in other tissues, so a blood test may not reflect all past exposures. If elevated levels are detected, it's also key to work to identify and address the source of exposure, as this can help to prevent ongoing contact that would continue to elevate levels. You’ll also want to review your results with your healthcare provider, as they can help interpret your results in the context of your symptoms, medical history, and potential sources of exposure.
Related: 10 lesser-known blood tests to ask your doctor about
Who might consider heavy metal testing?
Your healthcare provider may recommend heavy metal testing based on your symptoms, medical history, or the possibility of significant exposure. Testing may be worth discussing if you:
- Work in occupations where heavy metals are common: Jobs like construction, mining, battery manufacturing, shipyards, welding, metal recycling, or other industrial settings may put you in touch with heavy metals.
- Have known environmental exposure: If you’ve been drinking water from a source that’s known to be contaminated with heavy metals or have had significant exposure to lead-based paint or lead dust in an older home.
- Eat large, high-mercury fish frequently: This includes fish like swordfish, king mackerel, marlin, shark, or bigeye tuna.
- Have hobbies that involve heavy metals: Such as using indoor shooting ranges, making stained glass, working with ceramics or ceramic glazes, soldering, or metalworking.
- Regularly use imported spices, cosmetics, traditional remedies, or supplements
- Want to better understand your environmental health baseline as part of a broader proactive health assessment.
- Have symptoms or a medical history that make your healthcare provider suspect heavy metal exposure.
What happens if levels are elevated?
If a blood test shows elevated levels of a heavy metal, the next steps will depend on which metal you tested high for, how high the level is, your symptoms, and your medical history. Your healthcare provider will work with you to identify the potential source, as the first step will be eliminating or reducing exposure. This could involve switching from indoor shooting ranges to outdoors, filtering your drinking water, or taking steps to encapsulate lead-based paint inside the walls of your home.
Your healthcare provider may recommend repeating blood testing to monitor your levels, ordering additional testing, or referring you to a specialist if needed. Sometimes, eliminating exposure to the source can help to reduce levels. In other cases, doctors may recommend treatments when clinically appropriate, which can include supplementations or chelation therapy. Treatment depends on the metal and severity of exposure and may include supportive care or medically supervised chelation in selected cases. It’s very important to take your results to your healthcare provider and follow their guidelines, as at home detox protocols you may read about online can be inefficient at removing metals and sometimes even dangerous.
A detailed picture of your health
Heavy metal testing can tell you whether you have elevated levels of certain metals in your body, but it's only one piece of your overall health picture. To fully understand how your body is functioning, you may want to look beyond a single blood test.
That's where Prenuvo's broader assessments come in. A Whole Body Scan helps provide a detailed look at many of the body's major organs, while Body Composition Analysis offers additional information about visceral fat, muscle mass, and abdominal organ measurements. Together, these assessments can provide valuable context about your overall health.
And if you’re interested in taking a deeper dive into specific areas of the body, like the heart or brain, Prenuvo has advanced imaging add-ons. The Advanced Brain Health Scan provides insights into brain structure and volume, while an Advanced Heart Health Scan evaluates heart structure and function, including myocardial strain, MyoHealth Scores, and estimated ejection fraction. These scans are not designed to detect heavy metal exposure, but they can provide broad understanding of your brain and heart health over time.
Related: What happens when you combine whole body MRI and blood work?
Prenuvo Memberships bring these screenings together by combining imaging, bloodwork, a review of results, and ongoing tracking to make it easier to follow changes in your health over time.
To learn more about the benefits of a Prenuvo Membership, or any other Prenuvo service, book a call with the Patient Services Team.
