BPA in Canned Foods: What Consumers Need to Know

Canned foods offer convenience, affordability, and long shelf life, making them staples in many households. However, concerns about a chemical called Bisphenol A (BPA) in can linings have prompted questions about the safety of these pantry essentials. This article explores what BPA is, why it's used in food packaging, potential health concerns, and practical ways to reduce your exposure.

What is BPA?

Bisphenol A (BPA) is a synthetic chemical used to make certain plastics and resins since the 1950s. In food packaging, BPA is primarily found in the epoxy resin linings of metal food cans, which serve to prevent the can from corroding, extend shelf life, and maintain food quality.

This chemical belongs to a class of compounds known as endocrine disruptors—substances that can interfere with the body's hormone systems. BPA's structure resembles estrogen, allowing it to bind to estrogen receptors and potentially influence various bodily processes.

How BPA Gets Into Your Food

When BPA is used in can linings, small amounts can leach into the food, particularly under certain conditions:

Acidic foods: Tomatoes, citrus fruits, and some vegetables can accelerate BPA leaching
Fatty foods: Oils and fats may absorb more BPA than water-based foods
Heat exposure: Higher temperatures during processing, storage, or reheating can increase migration
Storage time: Longer storage periods may result in increased BPA levels

Studies by the Environmental Working Group (EWG) and other research organizations have found measurable levels of BPA in many canned foods, though the amounts vary significantly by product type and brand.

Potential Health Concerns

The science around BPA's health effects continues to evolve, but several concerns have been raised by researchers:

Endocrine Disruption

As an endocrine disruptor, BPA can mimic or interfere with natural hormones in the body. This disruption has been linked to various health effects in laboratory and animal studies, including:

Altered reproductive function
Changes in breast tissue development
Effects on metabolism and obesity
Impacts on neurological development

Potential Links to Chronic Conditions

Some epidemiological studies have found associations between higher BPA exposure and increased risk of:

Cardiovascular disease
Type 2 diabetes
Hypertension
Reproductive issues
Behavioral changes, particularly in children exposed during development

Vulnerable Populations

Certain groups may be more susceptible to potential adverse effects from BPA exposure:

Pregnant women: BPA can cross the placenta, potentially affecting fetal development
Infants and young children: Developing systems may be more vulnerable to endocrine disruption
Women with hormone-sensitive conditions: Those with certain reproductive health issues may be more affected by additional hormonal influences

Regulatory Status Around the World

Different countries have taken varying approaches to regulating BPA in food packaging:

United States

The FDA maintains that BPA is safe at the current levels occurring in foods, based on their review of hundreds of studies. However, in response to consumer concerns, the FDA banned BPA from baby bottles and sippy cups in 2012 and from infant formula packaging in 2013.

The FDA continues to review emerging research on BPA safety and has acknowledged some concerns about its potential effects, particularly on the brain, behavior, and prostate gland in fetuses, infants, and young children.

European Union

The European Food Safety Authority (EFSA) significantly lowered its safety threshold for BPA in 2015 and again in 2023. The EU has banned BPA in baby bottles and restricted its use in food contact materials, with specific migration limits.

Canada

Canada declared BPA a toxic substance in 2010 and prohibited its use in baby bottles. Health Canada continues to monitor and assess the latest scientific evidence on BPA.

France

France has implemented some of the strictest BPA regulations, banning the chemical from all food packaging, containers, and utensils.

Which Canned Foods Contain the Most BPA?

Research has found that BPA levels vary significantly among different types of canned foods:

Typically Higher BPA Levels

Canned soup: The combination of liquid, heat processing, and often acidic ingredients can lead to higher BPA levels
Canned pasta with tomato sauce: The acidity of tomatoes may increase BPA migration
Canned vegetables, particularly tomatoes: Again, acid plays a role in increased leaching
Canned beans with sauce: The liquid component allows for greater migration

Generally Lower BPA Levels

Canned fruits: Many have lower acidity than tomatoes
Canned tuna and other seafood: These products often have less liquid contact with the can lining
Canned beverages: Many have switched to BPA-free linings or alternative packaging

It's important to note that individual brands vary considerably in their use of BPA. Many manufacturers have voluntarily moved away from BPA-containing can linings in response to consumer concerns.

BPA-Free Alternatives: Are They Better?

As concerns about BPA have grown, many manufacturers have switched to "BPA-free" can linings. Common alternatives include:

Bisphenol S (BPS) and Bisphenol F (BPF): Chemically similar to BPA, raising concerns that they may have similar endocrine-disrupting properties
Polyester resins: Generally considered safer alternatives
Oleoresin: Plant-based linings made from natural substances like pine tar
Acrylic resins: Synthetic polymers used as alternative linings

Unfortunately, limited research exists on the long-term safety of many BPA alternatives. Some preliminary studies suggest that certain substitutes, particularly other bisphenols like BPS, may have similar hormonal effects to BPA.

This situation creates what scientists call a "regrettable substitution"—when a problematic chemical is replaced with inadequately tested alternatives that may later prove to have similar concerns.

How to Reduce Your BPA Exposure from Canned Foods

If you're concerned about BPA exposure, several practical steps can help reduce your intake:

Alternative Packaging Choices

Choose glass jars or cartons: Many foods available in cans are also sold in glass jars or paperboard cartons, which typically don't contain BPA.
Look for BPA-free labeled cans: Many brands now prominently advertise BPA-free linings.
Use frozen fruits and vegetables: Frozen produce is minimally processed and packaged without BPA-containing materials.
Cook from fresh ingredients: When possible, prepare meals from fresh ingredients rather than using canned options.

Smart Shopping Strategies

Research brands: Some companies have been more proactive about removing BPA from their products. The Environmental Working Group and similar organizations maintain updated lists of brands using BPA-free packaging.
Choose wisely when canned is necessary: If you must use canned foods, prioritize less acidic options like beans (drained and rinsed) over tomato products.
Buy in bulk and freeze: Purchase dried beans, prepare them in batches, and freeze portions for later use as a convenient alternative to canned beans.

Food Preparation and Storage Tips

Rinse canned foods: For canned beans, vegetables, and fruits, rinsing with water may help remove some BPA that has leached into the liquid.
Transfer leftovers to glass containers: If you don't consume an entire can, transfer the remaining food to glass or stainless steel containers rather than storing it in the can.
Avoid heating food in cans: Never heat food directly in a can, as heat increases BPA leaching.

A Balanced Perspective on Canned Foods

While BPA concerns are valid, it's important to maintain perspective when thinking about canned foods in your diet:

Nutritional Benefits

Canned fruits and vegetables provide essential nutrients and can be important components of a healthy diet, especially when fresh options are unavailable, unaffordable, or inconvenient. Many studies show that people who consume canned fruits and vegetables have higher overall fruit and vegetable intake.

Food Security Considerations

Canned foods play a crucial role in food security and emergency preparedness. Their long shelf life and relatively low cost make them accessible options for many households.

Risk Assessment

When evaluating whether to use canned foods, consider:

The frequency of consumption
Availability of alternatives
Your individual risk factors
The overall balance of your diet

For most adults, occasional consumption of canned foods is unlikely to pose significant health risks from BPA exposure alone, especially when balanced with fresh foods.

Special Considerations for Vulnerable Groups

Some populations may want to take extra precautions regarding BPA exposure:

Pregnant Women

During pregnancy, minimizing exposure to endocrine-disrupting chemicals is particularly important for fetal development:

Prioritize fresh or frozen foods when possible
Choose glass-packaged options for acidic foods like tomatoes
Look specifically for BPA-free canned foods when canned options are necessary

Families with Young Children

Children's developing systems may be more vulnerable to endocrine disruptors:

Limit canned foods in children's diets
Rinse canned beans and vegetables thoroughly
Choose brands that explicitly state they use BPA-free can linings for children's foods

The Future of Food Can Safety

The food packaging industry continues to evolve in response to safety concerns and consumer demands:

Improved alternatives: Ongoing research is focused on developing safer, more sustainable can linings
Enhanced testing methods: More sensitive techniques are being developed to detect chemicals migrating from packaging into food
Increased transparency: Many companies are providing more information about their packaging materials and safety testing
Regulatory evolution: As science advances, regulatory standards are likely to be updated to reflect new findings

Conclusion

BPA in canned foods represents a complex issue at the intersection of food safety, convenience, affordability, and scientific uncertainty. While research continues to investigate the potential health effects of BPA and its alternatives, consumers can take practical steps to reduce exposure while still enjoying the benefits of canned foods when needed.

By understanding which foods are more likely to contain BPA, choosing alternatives when possible, and employing simple food handling practices, you can minimize potential risks while making informed decisions about the food you bring into your home.

Remember that food choices involve balancing multiple factors—nutrition, accessibility, convenience, and potential risks. The occasional use of canned foods, even those with BPA-containing linings, is unlikely to pose significant health risks for most adults when part of an overall balanced diet.

References

Bittner, G. D., Yang, C. Z., & Stoner, M. A. (2023). "Estrogenic chemicals often leach from BPA-free plastic products that are replacements for BPA-containing polycarbonate products." Environmental Health, 13(1), 41.
Business Insider. (2024). "BPA in Canned Foods." Business Insider. https://www.businessinsider.com/guides/health/diet-nutrition/what-is-bpa 3. Environmental Working Group (EWG). (2023). "BPA in Canned Food." EWG. https://www.ewg.org/research/bpa-canned-food 4. Food and Drug Administration (FDA). (2024). "Bisphenol A (BPA): Use in Food Contact Application." FDA. https://www.fda.gov/food/food-additives-petitions/bisphenol-bpa-use-food-contact-application 5. Hartle, J. C., Navas-Acien, A., & Lawrence, R. S. (2022). "The consumption of canned food and beverages and urinary Bisphenol A concentrations in NHANES 2003–2008." Environmental Research, 150, 375-382.
Mayo Clinic. (2022). "BPA Concerns." Mayo Clinic. https://www.mayoclinic.org/healthy-lifestyle/nutrition-and-healthy-eating/expert-answers/bpa/faq-20058331 7. Vandenberg, L. N., Hauser, R., Marcus, M., Olea, N., & Welshons, W. V. (2023). "Human exposure to bisphenol A (BPA)." Reproductive Toxicology, 24(2), 139-177.