BPA: WHAT SCIENCE SAYS ABOUT HORMONAL DUSRUPTION, GUT HEALTH AND SAFEST CHOICES

 

Bisphenol A (BPA) is one of the most widely used chemicals in consumer products, and one of the most controversial. Found in plastics, food containers, and even receipts, BPA has been linked to hormonal disruption, metabolic issues, and possibly to gut health problems, including leaky gut. Let´s find out exactly how impacts our bodies and what to do about it.

 

Where BPA Hides in Everyday Life

Because BPA is so widely used, it often shows up in places you might not expect. Knowing the most common sources can help you make smarter choices to reduce your exposure.

• Canned foods and drinks. Most cans are lined with BPA-based epoxy resins to prevent corrosion and keep food tasting fresh. Acidic foods like tomatoes are especially prone to leaching BPA from the lining.

• Plastic food containers and water bottles. Polycarbonate plastics (often marked with recycling code #7) can release BPA, especially when heated, scratched, or aged. Think about plastic reusable cups, take away coffee cups, takeaway containers, to name a few.

• Receipts and tickets. Often, thermal papers are coated with BPA, which can transfer to the skin on contact. Thankfully, many business are shifting away from BPA containing paper.

• Household dust – Over time, BPA can migrate from plastics in electronics, flooring, or furniture into household dust that we inhale or ingest.

• Dental sealants and composites – Some dental materials can release small amounts of BPA or BPA derivatives.

• Oven baking paper – Some types of non-stick baking/parchment paper may contain BPA or similar coatings; look for unbleached, BPA-free, or PFAS-free versions as safer alternatives.

 

How BPA Gets into Your Body

BPA can enter the body through several everyday routes, and because it’s so widely used, exposure is surprisingly common. The most significant pathway is ingestion: when BPA leaches from food or drink containers into what you consume. This leaching can happen more readily when containers are exposed to heat (like microwaving food in plastic or leaving a water bottle in the sun), when the food or drink is acidic (such as tomato sauce or fizzy drinks), or when the container is old and scratched.

Once ingested, BPA passes through the digestive tract, where it can be absorbed into the bloodstream via the intestinal lining. From there, it travels throughout the body and can interact with various tissues. Normally, the liver helps break down and excrete BPA, but constant exposure can overwhelm this process, leading to low-level accumulation.

BPA can also be absorbed through the skin—for example, from handling thermal paper receipts—or via inhalation of household dust containing BPA particles from degraded plastics. While skin and inhalation exposures are generally smaller than dietary intake, they still contribute to the total body burden.

 

What BPA Can Do to the Body

BPA is considered an endocrine disruptor, meaning it can interfere with our hormone system. Hormones are chemical messengers that control many important processes, including growth, metabolism, reproduction, and mood. BPA can mimic or block these signals in ways that may cause problems over time.

Here’s how BPA may affect the body:

1. Hormonal Interference

BPA’s chemical structure is similar to oestrogen, the primary female sex hormone. Because of this, it can “trick” the body into thinking it’s estrogen. It binds to estrogen receptors in cells and sends out the wrong signals, potentially affecting reproductive health, menstrual cycles, and even sperm quality in men (1).

2. Metabolic Disruption

BPA can affect how the body responds to insulin, the hormone that helps control blood sugar. Disruption in insulin signaling can make it harder for cells to absorb glucose, leading to insulin resistance, a key step toward obesity and type 2 diabetes (2).

3. Impact on the Heart and Blood Vessels

BPA may raise oxidative stress and inflammation in blood vessels. Over time, these effects can contribute to high blood pressure and increase the risk of heart disease (3).

4. Effects on the Brain and Mood

In developing brains, BPA can interfere with the formation of neural connections and communication between brain cells. This may influence memory, behavior, and emotional regulation. In adults, BPA’s hormone-like activity may still affect mood and stress resilience (4).

5. Immune System and Inflammation

BPA can activate certain immune cells inappropriately, creating low-grade chronic inflammation (5). Chronic inflammation is linked to conditions ranging from arthritis to autoimmune disease—and may also impact gut health.

 

BPA and Leaky Gut

Research in animals shows BPA can weaken the intestinal barrier—a layer of cells that acts like a tight security gate, letting nutrients in but keeping harmful substances out. BPA seems to disrupt tight junction proteins, the “locks” between these cells, leading to increased intestinal permeability or “leaky gut” (6).

When the gut lining becomes leaky, bacteria and toxins can pass into the bloodstream, triggering immune responses and more inflammation. While human research is still emerging, these findings raise concerns about BPA’s role in digestive and immune-related health problems.

 

How to Avoid BPA

1. Choose fresh, frozen or tetrapack over canned foods unless labelled BPA-free.
2. Avoid heating plastic containers in microwaves or dishwashers.
3. Switch to glass, stainless steel, or ceramic containers. These are safe for hot or cold foods, easy to clean.
4. Check recycling codes and avoid #3 and #7 plastics (these can be found within the chasing arrows symbol in all food plastic containers).
5. Limit handling of receipts coated with BPA; wash hands afterward.

 

Small Changes, Big Wins

While the research on BPA paints a clear picture of its potential to disrupt hormones, metabolism, and gut health, the good news is that you can significantly reduce your exposure through small, mindful changes. By choosing BPA-free containers, storing food in glass or stainless steel, avoiding heating plastics, and prioritizing fresh/frozen over canned foods, you’re already taking powerful steps toward protecting your long-term health.

Your gut and body have an incredible capacity to heal and rebalance when given the right environment. Even if you’ve been exposed to BPA for years, shifting your daily habits can help reduce your toxic burden and support a healthier gut barrier, more balanced hormones, and better overall well-being.

It’s empowering to know that in the everyday choices you make—whether it’s how you store leftovers, the water bottle you use, or the packaging you buy—you’re actively shaping a healthier future for yourself and your loved ones.

 

References

Rubin, B. S. (2011). Bisphenol A: An endocrine disruptor with widespread exposure and multiple effects. J Steroid Biochem Mol Biol, 127(1-2), 27–34.

Bhandari, R., Xiao, J., Shankar, A. (2013). Urinary bisphenol A and obesity in U.S. children. Environ Health Perspect, 121(2), 225–230.

Shankar, A., Teppala, S. (2012). Urinary bisphenol A and hypertension in a multiethnic sample of US adults. J Environ Public Health, 2012, 481641.

Mustieles, V., et al. (2015). Bisphenol A: Human exposure and neurobehavior. Neurotoxicology, 49, 174–184.

Rochester, J. R. (2013). Bisphenol A and human health: A review of the literature. Reprod Toxicol, 42, 132–155.

Chen, M., et al. (2018). Bisphenol A disrupts intestinal barrier function and induces gut microbiota dysbiosis in mice. Environ Pollut, 238, 689–699.