Most types of plastic bottles are safe to reuse at least a few times if properly washed with hot soapy water. But recent revelations about chemicals in Lexan (plastic #7) bottles are enough to scare even the most committed environmentalists from reusing them (or buying them in the first place). Studies have indicated that food and drinks stored in such containers—including those ubiquitous clear Nalgene water bottles hanging from just about every hiker’s backpack—can contain trace amount of Bisphenol A (BPA), a synthetic chemical that interferes with the body’s natural hormonal messaging system.
The same studies found that repeated re-use of such bottles—which get dinged up through normal wear and tear and while being washed—increases the chance that chemicals will leak out of the tiny cracks and crevices that develop over time. According to the Environment California Research & Policy Center, which reviewed 130 studies on the topic, BPA has been linked to breast and uterine cancer, an increased risk of miscarriage, and decreased testosterone levels. BPA can also wreak havoc on children’s developing systems. (Parents beware: Most baby bottles and sippy cups are made with plastics containing BPA.) Most experts agree that the amount of BPA that could leach into food and drinks through normal handling is probably very small, but there are concerns about the cumulative effect of small doses.
Health advocates also recommend not reusing bottles made from plastic #1 (polyethylene terephthalate, also known as PET or PETE), including most disposable water, soda and juice bottles. According to The Green Guide, such bottles may be safe for one-time use, but reuse should be avoided because studies indicate they may leach DEHP—another probable human carcinogen—when they are in less than perfect condition. The good news is that such bottles are easy to recycle; just about every municipal recycling system will take them back. But using them is nonetheless far from environmentally responsible: The nonprofit Berkeley Ecology Center found that the manufacture of plastic #1 uses large amounts of energy and resources and generates toxic emissions and pollutants that contribute to global warming. And even though PET bottles can be recycled, millions find their way into landfills every day in the U.S. alone.
Another bad choice for water bottles, reusable or otherwise, is plastic #3 (polyvinyl chloride/PVC), which can leach hormone-disrupting chemicals into the liquids they are storing and will release synthetic carcinogens into the environment when incinerated. Plastic #6 (polystyrene/PS), has been shown to leach styrene, a probable human carcinogen, into food and drinks as well.
Safer choices include bottles crafted from safer HDPE (plastic #2), low-density polyethylene (LDPE, AKA plastic #4) or polypropylene (PP, or plastic #5). Consumers may have a hard time finding water bottles made out of #4 or #5, however. Aluminum bottles, such as those made by SIGG and sold in many natural food and product markets, and stainless steel water bottles are also safe choices and can be reused repeatedly and eventually recycled.
How is plastic made and identified?
How many times a day do you use something made from plastic? I can guarantee that it's more than you think. Plastic has been a part of our lives for over 100 years, and its use continues to grow. In 2002, about 107 billion pounds of plastic were produced in North America. Recently, claims have been made about certain types of plastic being unsafe. Are we getting more than just storage when it comes to using plastic?
The process of making plastic is a complicated one. It begins with carbon from petroleum, natural gas, coal, or biological sources. The elements can be combined in various combinations in order to achieve a desired property and characteristic. The final product can be hard like the siding on your house or soft and flexible like shrink wrap.
Have you ever noticed the number with the arrows surrounding it on your plastic bottles? Many people use these numbers to determine how the product is to be recycled. These numbers are called the plastic packaging resin identification codes. They indicate the type of plastic that the item was made from and are used to help consumers know whether and how the item is to be recycled. According to the American Chemistry Council, the resin identification numbers are as follows:
- No. 1: Polyethylene Terephthalate (PET, PETE)
- No. 2: High-Density Polyethylene (HDPE)
- No. 3: Polyvinyl Chloride (PVC, vinyl)
- No. 4: Low-Density Polyethylene (LDPE)
- No. 5: Polypropylene (PP)
- No. 6: Polystyrene (PS)
- No. 7: Other: when package is made with a resin other than the six listed above, or is made of more than one resin and used in a multi-layer combination
Before a product made of plastic is allowed to hold any of your food, it needs to be tested for its intended purpose. For example, the plastic that is approved for use in your microwave has been approved for that purpose, while the plastic that carries your water was approved for that use. The U.S.Food and Drug Administration (FDA) admits that something will always "leach out of the container and into the food," so they try to determine the amount that someone will ingest over a lifetime versus the levels of a given substance that are known to be toxic. Their goal is to make sure that during our lifetime the amount that we consume will not pose any risk to our health. But what if their estimate of how much we consume is incorrect? What if the product containing plastic is not used according to the directions? These questions could be lifesaving ones. The first step is to know what kind of plastic is in your cabinets.
#1. What is polyethylene terephthalate (PET, PETE)?
According to the American Chemistry Council, PET has been approved as safe by the FDA and the International Life Sciences Institute (ILSI). In 1994, ILSI stated that "PET polymer has a long history of safe consumer use, which is supported by human experience and numerous toxicity studies." The American Chemistry Council cautions that products made with PET be used only as indicated by the manufacturer. For example, the microwavable trays are only to be used one time and not to store or prepare foods other than those for which they are intended.
Recent studies have shown that reusing bottles made of PET can in fact be dangerous. PET was found to break down over time and leach into the beverage when the bottles were reused. The toxin DEHA also appeared in the water sample from reused water bottles. DEHA has been shown to cause liver problems, other possible reproductive difficulties, and is suspected to cause cancer in humans. Therefore, it's best to recycle these bottles without reusing them.
#2. What is high-density polyethylene (HDPE)?
#3. What is polyvinyl chloride (PVC, vinyl)?
There are claims that PVC poses serious environmental health threats. According to the Center for Health, Environment, and Justice, the production of PVC requires chemicals like the "highly polluting chlorine," the "cancer-causing" vinyl chloride monomer (VCM), and ethylene dichloride (EDC). They also claim that PVC plastic requires large amounts of toxic additives to make it stable and usable. These additives are released during use and disposal, resulting in "elevated human exposures to phthalates, lead, cadmium, tin, and other toxic chemicals." In 2000, the Environmental Protection Agency (EPA) proposed national standards to limit air toxic emissions from polyvinyl chloride production plants.
The FDA acknowledges that the building block of PVC, vinyl chloride, is a human carcinogen. They conclude that the amount contained in the PVC food packaging is within safe limits. In 2002, the FDA recommended that a specific compound used as a plasticizer in PVC either be labeled or removed from the medical bags in which it was being used. This compound, DEHP, had shown some toxic and carcinogenic effects in lab animals, but the effects on humans were unknown. The invasive medical procedures in which this was being used may have exposed people to DEHP levels that would exceed the amount determined to be safe in humans.
#4. What is low-density polyethylene (LDPE)?
#5. What is polypropylene (PP)?
Polypropylene (PP) is known for its high melting point, which makes it ideal for holding hot liquids that cool in the bottles (for example, ketchup and syrup). It can be manufactured to be flexible or rigid. PP is used to make containers for yogurt, margarine, takeout meals, and deli foods. It is also use for medicine bottles, bottle caps, and some household items. It is identified as number 5.#6. What is polystyrene (PS)?
#7. What is bisphenol A?
Bisphenol A (BPA) is a widely produced chemical used primarily for the production of polycarbonate plastics and epoxy resins. More than 6 billion pounds of BPA are produced and used each year for this purpose. The use of this chemical is so profound that it was detected in the urine in 93% of the population over 6 years of age. The study did not include anyone under 6 years of age, so the level in their urine is unknown. Bisphenol A (or BPA) is a high-volume industrial chemical used as a monomer (or chemical backbone) to make polycarbonate plastic, which is widely used in reusable water bottles, baby bottles, pacifiers, plastic utensils, children’s toys, compact discs, and certain microwaveable and reusable plastic containers. BPA is also used in some dyes, enamels, varnishes, flooring, adhesive, fungicides, antioxidants, dental sealants and artificial teeth. A chemical derivative of BPA called bisphenol A diglycidyl ether (BADGE) is used to make epoxy resins which are widely used in many applications. Human exposure to bisphenol A (and BADGE) results from the use of BADGE in the clear lining of metal food and drink cans, and from some dental sealants and composite dental fillings.- less than 0.0147 mg/kg bw/day for children;
- less than 0.0015 mg/kg bw/day for adults; and
- 0.0100 mg/kg bw/day for workers exposed to this chemical.
Studies done on laboratory rodents have shown that high doses of BPA during pregnancy and lactation can reduce survival, birth weight, and growth of offspring early in life, and delay the onset of puberty. The doses given were significantly higher than the estimated human exposures:
- Delayed puberty: greater than 50 mg/kg bw/day
- Growth retardation: greater than 300 mg/kg bw/day
- Survival: greater than 500 mg/kg bw/day
BPA has also been linked to cancer, diabetes, and obesity in animals. The American Chemistry Council states that "consumers would have to eat more than 500 pounds of food and beverages in contact with polycarbonate plastic or epoxy resins every day of their lives to exceed exposure levels determined to be safe by the European Food Safety Authority and the U.S. Environmental Protection Agency." There is no way to know for sure if humans would have the same reaction that the animals have had, but there is enough evidence to be concerned and warrant further studies.
The highest estimated intakes of bisphenol A occur in infants and children. Their intake is greatest because pound for pound they eat, drink, and breathe more than adults. BPA is found in the plastic baby bottles and the linings of cans of powdered and liquid formula. Their exposure is also increased by the objects that they put in their mouth. It's important to note that bisphenol A has been detected in the blood of pregnant women and in the breast milk of lactating women.
One thing that many people seem to agree on is that high temperatures can cause BPA to leach into the food or beverage. In one study, boiling water was placed in hard plastic water bottles. The rate of release of BPA with the boiling water was compared with room-temperature water. With room-temperature water, BPA was released at a rate of 0.2 to 0.8 nanograms per hour. The BPA was released 15 to 55 times faster with the boiling water, with a rate of 8 to 32 nanograms per hour. The concern about this has led Canadian retailers to pull all baby bottles made with BPA from the shelves. In the United States, many manufacturers and retailers are beginning to do the same.
Other BPA Health Risks
No one is immune to the health risks of BPA. Research has linked BPA to:
- Structural damage to your brain
- Hyperactivity, increased aggressiveness, and impaired learning
- Increased fat formation and risk of obesity
- Altered immune function
- Early puberty, stimulation of mammary gland development, disrupted reproductive cycles, and ovarian dysfunction
- Changes in gender-specific behavior, and abnormal sexual behavior
- Stimulation of prostate cancer cells
- Increased prostate size, and decreased sperm production
- Diabetes
- Heart disease
- Liver damage
BPA Alternatives:
Tips to Reduce Your Exposure to BPA
To be fair, you probably can no longer completely eliminate your exposure to BPA (since it's likely in our air, water, and food, too) but you can certainly reduce your exposure dramatically.
The following tips will not only reduce your exposure to BPA, but also to many of the other dangerous plastics chemicals as well.
1. Only use glass baby bottles and dishes for your baby
2. Give your baby natural fabric toys instead of plastic ones
3. Store your food and beverages in glass - NOT plastic - containers. Do not use polycarbonate - BPA plastic containers (Tupperware for example).
4. IF you choose to use a microwave, don't microwave food in a plastic container, use glass or ceramic
5. Stop buying and consuming canned foods and canned soft drinks
6. Avoid using plastic wrap (and never microwave anything covered in it)
7. Get rid of your plastic dishes and cups, and replace them with glass
8. If you opt to use plastic kitchenware, at least get rid of the older, scratched-up varieties, avoid putting them in the dishwasher, and don't wash them with harsh detergents
9. Avoid using bottled water; filter your own using a reverse osmosis or other type of water filter. Use Stainless steel water bottles.
10. Before allowing a dental sealant to be applied to you, or your children's, teeth, ask your dentist to verify that it does not contain BPAIn the event that you do opt to use plastic containers for your food, be sure to avoid those marked on the bottom with the recycling label No. 7, or the letters PC, as these varieties are most likely to contain BPA.
Dr. Mercola's comments
You would think labeling a product "BPA-Free" would be some measure of protection against ingesting this toxic plastic by-product, but it turns out that tests on plastics using this label have not been conducted under real-world conditions like running the plastics through a dishwasher or heating them in a microwave.
In the "real-world", 95 percent of all plastic products in the study above tested positive for estrogenic activity, meaning they can still disrupt your hormones even if they carry a BPA-Free label. Even more disconcerting is the finding that BPA-Free plastics in some cases leached more BPA than the non-BPA free plastics.
Does this mean there is no safe plastic when it comes to storing or serving your food or drinks?
In a word, yes, that's what it means.
I suppose you could research exactly which five percent of commercial plastic products did not leach BPA in the study mentioned above, but my guess is you'll never be able to identify which products contain this very specific variation of plastic, because commercial products are not required to list details like that on their labels.
This is another study in a long line of scientific studies that highlight the fact that eating or drinking out of plastic containers will deposit residual BPA into your body, potentially causing a whole host of health problems that I will list in more detail below.
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