Key takeaways
- Lead, arsenic, cadmium and mercury occur naturally and from past pollution. Plants take them up from soil and water, so traces end up in many foods, organic or not.
- A few foods stand out: rice for arsenic, big predatory fish for mercury, leafy greens, grains and potatoes for cadmium, and some spices, cocoa and protein powders for lead.
- The FDA has set action levels for some foods, mostly for babies and young children, and more are on the way. Most foods have no food-specific limit, though the FDA can still act against unsafe ones.
- There’s no good evidence that any food or “detox” flushes metals out. Eating a variety of foods, cooking rice in extra water and choosing low-mercury fish can lower what you take in.
How heavy metals get into food
Heavy metals are in the soil, water and air where food is grown, raised and processed. They occur naturally and are often higher where there was past industry and pollution.[1] Crops take them up as they grow, and animals take them in from what they eat and drink.
The four the FDA focuses on are lead, arsenic, cadmium and mercury. The concern is steady exposure over months and years, so the FDA’s Closer to Zero plan aims to drive levels in food for babies and young children down over time.[2]
Share of FDA Total Diet Study samples with each metal detected
- Cadmium61%
- Arsenic (total)43%
- Lead15%
- Mercury8%
The FDA’s Total Diet Study buys foods across the country, prepares them the way people usually would, and tests them for nutrients and contaminants.[3]
Which foods have the most heavy metals?
Each metal has its own usual suspects:
| Metal | Foods that tend to carry more | Main health concern | Our guide |
|---|---|---|---|
| Lead | Some ground spices, especially from informal sources; cocoa; root vegetables; some protein powders and shakes | Children’s brain development; no known safe level | Cinnamon, protein powder |
| Inorganic arsenic | Rice and rice products, fruit juices, some vegetables | Cancer, heart disease and diabetes with long-term exposure | Rice |
| Cadmium | Grains and bread, leafy greens like spinach and lettuce, potatoes, sunflower seeds, cocoa | Kidney damage and weaker bones | Chocolate |
| Methylmercury | Big fish that eat other fish, like swordfish, shark and bigeye tuna | The developing brain, before birth and in early childhood | Fish, tuna |
Foods high in a metal aren’t always the biggest source of it, because how much you eat matters too. A 2010 EPA model of U.S. diets estimated that rice supplied 17% of the inorganic arsenic people got from food, and vegetables, fruits and juices together 42%:[7]
Estimated sources of inorganic arsenic in U.S. diets
- Vegetables24%
- Fruit juices and fruits18%
- Rice17%
- Beer and wine12%
- Flour, corn and wheat11%
Cadmium works the same way. Spinach and sunflower seeds had the highest cadmium in the FDA’s testing, but a study of 2007–2012 U.S. diets estimated that cereals and bread supplied about a third of dietary cadmium, and leafy vegetables a fifth.[3][11]
How much is too much?
Health agencies use reference levels to judge long-term exposure. They aren’t guarantees of safety or amounts to aim for, and most scale with body weight. The EPA’s arsenic reference dose covers effects other than cancer; it doesn’t define a cancer-safe intake.[6]
| Metal | Reference level | For a 150-lb adult |
|---|---|---|
| Lead (FDA) | 2.2 µg a day for children, 8.8 µg for women who could become pregnant | Not scaled by weight |
| Inorganic arsenic (EPA, 2025) | 0.06 µg per kg of body weight a day | about 4 µg a day |
| Cadmium (FDA) | 0.21–0.36 µg per kg of body weight a day | about 14–24 µg a day |
| Cadmium (EFSA, 2009) | 2.5 µg per kg of body weight a week | about 170 µg a week |
| Methylmercury (EPA) | 0.1 µg per kg of body weight a day | about 7 µg a day |
These are averages over time, not limits for a single meal. For lead, the FDA’s levels cover all the food you eat in a day, and they’re benchmarks rather than safe allowances: the FDA says there’s no known safe level of lead exposure.[4] The CDC says no safe blood lead level in children has been found.[5]
What the FDA limits cover
The FDA sets “action levels” for some foods. They’re guidance for industry rather than binding law, and above them the FDA may act against a food. Most cover foods for babies and young children.[2]
| Food | Metal and level | Status |
|---|---|---|
| Covered packaged foods for children under 2 | Lead, 10–20 ppb | Final, January 2025 |
| Infant rice cereal | Inorganic arsenic, 100 ppb | Final, August 2020 |
| Apple juice | Inorganic arsenic, 10 ppb | Final, June 2023 |
| Candy, including chocolate, often eaten by small children | Lead, 100 ppb | Since 2006 |
| Fish and shellfish | Methylmercury, 1 ppm | Long-standing |
| Juices | Lead, 10 ppb in apple juice and 20 ppb in other juices | Draft, 2022; final planned for 2027 |
| Covered packaged foods for children under 2 | Cadmium, 10–45 ppb | Draft, October 2026 |
| Foods for babies and young children | Inorganic arsenic | Draft planned for 2027 |
Many everyday foods, like spices, rice and protein powder, have no food-specific FDA limit. They still have to be safe, and the FDA can act when contamination makes a food unsafe.[10] Our guide to heavy metals in baby food covers the baby food levels in detail.
Signs of heavy metals in your body
Can any foods flush out heavy metals?
There’s no good evidence that ordinary foods or detox diets reliably remove heavy metals. A review found no compelling research supporting “detox” diets for removing toxins.[17] Suspected metal poisoning needs a doctor, not a cleanse. The FDA has never approved any chelation product for over-the-counter use.[18]
What helps is eating well. The CDC says a balanced diet with calcium, iron and vitamin C may help keep lead out of the body.[19]
How to eat fewer heavy metals
- Eat a variety of foods. Rotating grains, vegetables and proteins may lower repeated exposure from any one source.[20]
- Cook rice like pasta, in 6 to 10 parts water and then drained. It can cut inorganic arsenic by 40–60%, depending on the rice, though it washes out some added nutrients too.[20]
- Choose low-mercury fish like salmon, sardines, shrimp and canned light tuna, and skip swordfish, shark and bigeye tuna.[13]
- Test your well water if you have a private well. Owners are responsible for its safety.[21]
- Be careful with imported spices, candy and pottery. Lead can’t be seen or tasted, and lead in some pottery can leach into food.[22][4]
- Don’t smoke. Smokers take in more cadmium.[28]
- Ask for lab results. Some brands publish metal results for each batch. Our guide to reading a COA shows how to read them.
Organic doesn’t solve this. USDA organic rules require farming practices that don’t add to heavy metal contamination, but they don’t set numerical limits for metals in organic food.[23] In tests of baby foods and chocolate, organic products weren’t consistently lower.[24][25]
Questions people ask
- Which foods are highest in heavy metals?
- Rice and rice products are high in inorganic arsenic. Big predatory fish such as swordfish, shark and bigeye tuna are high in mercury. Spinach, sunflower seeds and cocoa can be high in cadmium. Some spices, especially from informal sources, cocoa products and some protein powders have been found with high lead.
- What foods flush out heavy metals?
- There’s no good evidence that any ordinary food or detox diet reliably removes heavy metals, and the FDA has never approved a chelation product for over-the-counter use. The CDC says a balanced diet with calcium, iron and vitamin C may help keep lead out of the body.
- What are the signs of heavy metals in your body?
- Symptoms aren’t a reliable guide. Most children with lead in their blood have no obvious symptoms, and a blood test is the best way to know. Medical toxicologists advise against provoked urine tests and say hair and nail tests are frequently unreliable.
- Is organic food lower in heavy metals?
- Not necessarily. Heavy metals come from soil and water, and USDA organic rules don’t set numerical limits for them in organic food. In tests of baby foods and dark chocolate, organic products were not consistently lower.
- Are heavy metals in food dangerous?
- Traces in food are common and usually low. The concern is steady exposure over months and years, especially for children and during pregnancy. In the FDA’s 2018–2020 Total Diet Study, most results for the four metals were below what labs could detect, and every food with an FDA action level at the time was below it.
Sources
- [1]U.S. Food and Drug Administration. Environmental contaminants in food. accessed October 2026.
- [2]U.S. Food and Drug Administration. Closer to Zero: Reducing childhood exposure to heavy metals from foods. accessed October 2026.
- [3]U.S. Food and Drug Administration. Total Diet Study report: fiscal years 2018–2020 elements data. July 2022.
- [4]U.S. Food and Drug Administration. Lead in food and foodwares. accessed October 2026.
- [5]Centers for Disease Control and Prevention. About childhood lead poisoning prevention. accessed October 2026.
- [6]U.S. Environmental Protection Agency. Inorganic arsenic: Integrated Risk Information System (IRIS). January 2025.
- [7]Environmental Health Perspectives. Xue et al., Probabilistic modeling of dietary arsenic exposure and dose and evaluation with 2003–2004 NHANES data. 2010.
- [8]U.S. Food and Drug Administration. Arsenic in food. accessed October 2026.
- [9]European Food Safety Authority. EFSA sets lower tolerable intake level for cadmium in food. March 2009.
- [10]U.S. Food and Drug Administration. Cadmium in food and foodwares. accessed October 2026.
- [11]Nutrients. Kim et al., Dietary cadmium intake and sources in the US. December 2018.
- [12]U.S. Environmental Protection Agency. Methylmercury (MeHg): Integrated Risk Information System (IRIS). reference dose last revised 2001.
- [13]U.S. Food and Drug Administration and Environmental Protection Agency. Advice about eating fish. revised October 2021.
- [14]U.S. Food and Drug Administration. Guidance for industry: Lead in candy likely to be consumed frequently by small children. 2006.
- [15]Centers for Disease Control and Prevention. Lead poisoning symptoms and complications. accessed October 2026.
- [16]American Academy of Clinical Toxicology and American College of Medical Toxicology. Choosing Wisely: Five things physicians and patients should question. 2013, updated 2015.
- [17]NIH National Center for Complementary and Integrative Health. “Detoxes” and “cleanses”: What you need to know. accessed October 2026.
- [18]U.S. Food and Drug Administration. Questions and answers on unapproved chelation products. accessed October 2026.
- [19]Centers for Disease Control and Prevention. Preventing lead poisoning in children. accessed October 2026.
- [20]U.S. Food and Drug Administration. What you can do to limit exposure to arsenic. accessed October 2026.
- [21]U.S. Environmental Protection Agency. Private drinking water wells. accessed October 2026.
- [22]Centers for Disease Control and Prevention. About lead in foods, cosmetics, and medicines. accessed October 2026.
- [23]Electronic Code of Federal Regulations. 7 CFR 205.203: Soil fertility and crop nutrient management practice standard. accessed October 2026.
- [24]Consumer Reports. Heavy metals in baby food: What you need to know. August 2018, updated June 2023.
- [25]Frontiers in Nutrition. Hands et al., A multi-year heavy metal analysis of 72 dark chocolate and cocoa products in the USA. July 2024.
- [26]U.S. Food and Drug Administration. Draft supporting document for establishing FDA’s action levels for lead in juice. April 2022.
- [27]U.S. Food and Drug Administration. Draft guidance: Action levels for cadmium in processed food intended for babies and young children. October 2026.
- [28]Agency for Toxic Substances and Disease Registry. ToxFAQs for cadmium. accessed October 2026.
- [29]Consumer Reports. Protein powders and shakes contain high levels of lead. October 2025, updated January 2026.
This article is for general information. It is not medical advice and does not replace a doctor, dietitian or pediatrician. Purus gives estimates for general information; it is not a medical device and does not diagnose, treat or prevent any condition.
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