Heavy Metals in Canned Foods: A Guide for Moms
Key Takeaways
- Heavy metals including lead, arsenic, cadmium, and mercury can leach into canned foods from both the food itself and the can lining, especially when the protective coating deteriorates.
- Pregnant women and babies face the highest risk because heavy metals cross the placenta and the blood-brain barrier, and accumulate in the body over time.
- Practical swaps — choosing BPA-free, organic, or frozen alternatives and selecting third-party-tested tinned fish — meaningfully reduce exposure without overhauling your entire pantry at once.
Canned and tinned foods are a busy mom's best friend, but the research on heavy metals in canned goods is worth understanding before your next grocery run.
TL;DR:
- Heavy metals like lead, arsenic, cadmium, and mercury can leach from can linings and the food itself into what you're eating.
- Pregnant women and young children are most vulnerable because these metals cross the placenta, accumulate in the body, and can affect brain development.
- Start by swapping to BPA-free canned tomatoes, wild-caught third-party-tested tinned fish, and organic beans — then build from there.
Why Should Moms Care About Heavy Metals in Canned Food?
Heavy metals are not safe for humans at any life stage. They disrupt cellular health and hormones, create significant stress on the body, accumulate over time, and cross both the placenta and the blood-brain barrier. For pregnant women, that last point matters most.
A ten-year analysis of 5,854 seafood samples published in Foods found cadmium, lead, and mercury across commercial seafood products, with 2.43% of samples exceeding regulatory limits and swordfish the worst offender for mercury at 11.3% non-compliance. The same Scientific Reports analysis points to the packaging itself, including soldered seams, as a documented route for lead and tin to migrate into the food inside.
What this means for your family: Even "safe" cans can become a source of heavy metal exposure over time, especially if they're dented, old, or highly acidic inside.
Exposure during pregnancy is associated with developmental delays, cognitive impairment, and disrupted fetal brain development. A 2026 review of 36 epidemiological studies examining lead, cadmium, mercury, and arsenic found associations with autism spectrum disorder, though the results across studies were inconsistent and the authors call for longer-term research. This is not meant to alarm you. It is meant to help you know where to focus first.
Which Heavy Metals Show Up in Canned Foods?
Lead and Tin
Lead and tin are the two metals most directly tied to the can itself. The interior lining of a standard steel can is designed to prevent metal from touching food, but that lining is not foolproof. Dented cans, acidic foods like tomatoes, and longer storage times all increase the chance of leaching. A 2025 study in Scientific Reports measured lead at 0.19 mg/kg in canned tomato paste and 0.22 mg/kg in canned pickled cucumbers, both above the Codex permissible limit of 0.1 mg/kg for canned products.
What this means for your family: Avoid dented cans entirely, and prioritize BPA-free or glass-jarred tomato products, which are highly acidic and interact most with metal linings.
Mercury and Arsenic
Mercury concentrates in larger, longer-lived fish. Arsenic is absorbed from soil and water, which means it shows up heavily in rice-based foods and root vegetables. Both are present in some canned fish, canned soups, and canned vegetables.
SCRUNCHY MOM TIP: When buying tinned fish, look specifically for brands that publish third-party heavy metal test results on their website. This one label check does more than any other filter.
Cadmium
Cadmium accumulates in the kidneys and is found in grains, leafy vegetables, and organ meats. It also appears in some canned legumes. Lead and cadmium are found in many of the food items we most frequently eat, including grain products and vegetables, according to the Norwegian Institute of Public Health. Organic farming practices can reduce cadmium content because synthetic phosphate fertilizers are a known cadmium source.
Which Canned Foods Are the Riskiest?
Not all canned goods carry equal risk. Here is a practical way to think about it.
| Canned Food Category | Primary Concern | Risk Level | Best Swap |
|---|---|---|---|
| Tomatoes & tomato paste | High acidity increases metal leaching from lining | Higher | Glass jar or organic BPA-free |
| Tuna and large fish | Mercury accumulation | Higher | Wild sardines, mackerel, salmon |
| Corn | GMO crop, pesticide residue, added sugar | Moderate | Organic canned or frozen |
| Beans & lentils | Pesticide, glyphosate residue | Moderate | Organic canned or dried |
| Chickpeas | Cadmium from soil; BPA lining | Moderate | Organic, BPA-free brands |
| Sardines & small fish | Lower mercury, but verify sourcing | Lower | Third-party tested brands |
| Coconut milk | BPA lining; some brands add gums | Lower-Moderate | BPA-free cartons |
What About the Can Lining Itself?
BPA (bisphenol-A) is an endocrine disruptor, meaning it can interfere with your hormones, and it was widely used in the epoxy lining of food cans. Many brands have removed BPA, but some have replaced it with BPS or other bisphenol variants that carry similar concerns. "BPA-free" does not always mean the lining is inert.
The FDA maintains an ongoing review of BPA in food contact materials, and the science continues to evolve. For now, looking for cans explicitly labeled BPA-free and BPS-free, or choosing food stored in glass jars, is a meaningful step.
What this means for your family: Glass-jarred tomatoes and beans eliminate the lining concern entirely and are widely available at mainstream grocery stores.
How to Reduce Heavy Metal Exposure From Canned Foods
Start Here: The Good / Better / Best Framework
Good: Choose BPA-free labeled cans, rinse canned beans and vegetables thoroughly before eating, and avoid dented or swollen cans.
Better: Prioritize organic canned tomatoes, organic beans, and wild-caught tinned fish. Corn is one of the most genetically modified crops and conventionally grown corn is often treated with pesticides and preservatives, so organic matters here. Rinsing canned beans also removes a significant portion of the sodium and any residual can-lining contact.
Best: Transition high-use items to glass jars or frozen. Cascadian Farm offers organic frozen vegetables including corn and peas as a straightforward swap that sidesteps the can lining issue entirely while keeping costs reasonable.
For tinned fish specifically: wild-caught sardines, mackerel, and salmon are lower in mercury than tuna and are among the most nutrient-dense foods available. Patagonia Provisions lemon herb mussels are responsibly sourced, third-party reviewed, and a solid option for getting omega-3s without the mercury concern of larger fish.
For beans and pantry staples, Eden Foods is a principled organic brand known for BPA-free can linings and traditionally prepared beans and grains. Their cans have used a non-BPA lining since the 1990s, longer than almost any other mainstream brand.
What About Water?
Heavy metals in food are only part of the picture. Lead and other metals can also enter through tap water, especially in older homes with older pipes. Filtering your drinking and cooking water removes a meaningful source of daily exposure. AquaTru uses reverse osmosis technology effective at removing lead, fluoride, and PFAS. Clearly Filtered offers pitcher and under-sink options using Affinity Filtration technology targeting similar contaminants. Either is a strong choice depending on your kitchen setup and budget.
If you're on a tight budget, start with a Clearly Filtered pitcher and don't stress yet about an under-sink system.
How to Store Food Once It's Out of the Can
Once a can is opened, transfer contents immediately into glass storage. Leaving acidic or fatty food sitting in an open metal can accelerates leaching. Pyrex glass containers are non-porous, won't harbor bacteria or mold, and won't react with acidic foods the way metal or plastic can. They're also a one-time purchase that lasts years.
Start here this week: Buy one set of glass storage containers and make it a habit to transfer canned leftovers before refrigerating. That one change covers dozens of future meals.
Good Brands to Buy
- Eden Foods — Organic beans and grains in BPA-free cans; one of the longest-standing clean-label pantry brands in the US. Budget-friendly per serving.
- Patagonia Provisions Lemon Herb Mussels — Responsibly sourced tinned shellfish; lower mercury than tuna options.
- Cascadian Farm — Organic frozen vegetables as a can-free swap; widely available and affordable.
- AquaTru — Countertop reverse osmosis filter that removes lead and other heavy metals from drinking water.
- Clearly Filtered — Budget-accessible pitcher filter for lead, fluoride, and PFAS reduction.
- Pyrex — Glass food storage to replace metal or plastic containers after opening canned goods.
FAQ
Q: Is it safe to eat canned food every day during pregnancy?
Canned food can be part of a healthy pregnancy diet, but daily use from conventional cans with BPA linings or high-mercury fish is worth reducing. Prioritize BPA-free or glass-jarred options, choose organic when possible, and vary your protein sources so no single tinned fish dominates your weekly intake. The FDA recommends pregnant women eat 8–12 ounces of low-mercury seafood per week and avoid high-mercury species like shark, swordfish, king mackerel, and bigeye tuna.
Q: What is the safest canned fish for pregnancy?
Canned sardines, salmon, and mackerel are consistently lower in mercury than canned albacore or chunk light tuna. Look for wild-caught on the label and a brand that publishes third-party heavy metal testing results. Avoid brands that don't disclose sourcing. Tinned mussels from brands like Patagonia Provisions are also a lower-mercury option with strong omega-3 content.
Q: Do organic canned foods still contain heavy metals?
Organic certification reduces pesticide and glyphosate residue but does not eliminate heavy metals entirely, because metals are naturally present in soil and water. Organic farming practices do tend to reduce cadmium exposure since synthetic phosphate fertilizers (a key cadmium source) are prohibited. The can lining remains a separate concern regardless of organic certification, so BPA-free or glass-jarred remains the priority even when buying organic.
About the Author
Jenn Smith, RN BSN, is a registered nurse, mom, and co-founder of Scrunchy Living. She writes evidence-based guides to non-toxic living, pregnancy-safe products, and clean home practices for modern families.
Shop These Recommendations
| Product | Why It's Worth It | Amazon |
|---|---|---|
| Eden Foods | A principled organic food brand offering a wide range of pantry staples. Known for its… | Buy on Amazon |
| Patagonia Provisions | The food division of Patagonia, offering shelf-stable, responsibly sourced tinned mussels… | |
| AquaTru | A countertop Reverse Osmosis water purifier. Effective at removing a wide range of toxins… | |
| Clearly Filtered | A brand offering water pitchers and under-sink filters with "Affinity Filtration"… | |
| Pyrex | A classic brand for glass food storage and bakeware. Their glass containers are durable… | |
| Cascadian Farm | A large organic brand (General Mills) offering frozen fruits, vegetables, and potatoes… |
From Scrunchy Living: ScrunchyAI is our AI-powered guide to non-toxic living — scan ingredient labels, compare products, and get personalized answers for your home and family. Start your free 14-day trial →
You Might Also Like
- Heavy Metals in Baby Food: What to Buy Instead (2026)
- Heavy Metals in Protein Powder & Chocolate: A Mom's Guide
- Scrunchy All-Purpose Wipes — Our most-loved non-toxic cleaning essential — safe for babies, surfaces, and the whole family.
Medical Disclaimer: This article is for educational purposes only and does not constitute medical advice. Always consult your healthcare provider, OB-GYN, or midwife regarding dietary choices during pregnancy and postpartum. Individual health needs vary, and no article can substitute for personalized clinical guidance.