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Good and Bad PLASTICS |

The more antioxidant the foods you eat, the more likely they are to leach chemicals out of the containers they are stored in. Plastics can be some of the worst containers to use with food, if you do not understand their ability to react with food. Here are a few basic tips.
Short Version: Look on the bottom of each plastic you use with food. Plastics numbers 1,2,4 and 5 are the safest for food (especially if you do not reuse them long term), but remember to keep your number 5’s out of the sunlight. Completely avoid numbers 3,6 and 7. Also avoid using your plastics in the microwave or with hot fat. Whenever possible, replace plastics with glass (regular glass, not crystal -- which contains lead), ceramics or stainless steel. Avoid food, water, and other beverages sold in plastic containers and bottles. For example, try to buy water from distributors who can deliver large glass jugs in convenient dispensers. Avoid micrwaveable packages, boil-in-a-bag, bake-in-a-bag, and do not allow any plastic wraps to touch your food. If you have to use a plastic bag, choose the ziplock ones (not made of PVC)
Long Version: Plastics are classified based on their Resin Identification Code:
Plastic Types |
Safety Information and Cautions |
PET (PETE) = polyethylene terephthalate
e.g. Bottles: 2-liter soft drink, cooking oil, other soft drinks, water, sports drinks, ketchup, salad dressing, etc. Jars for peanut butter, pickle, jelly and jam, etc. |
GOOD! Not known to leach any chemicals that are suspected of causing cancer or disrupting hormones.
CAUTION: PET is a thermoplastic polymer resin that comes from polyester. When PET begins to degrade, it releases Acetaldehyde (=ethanal).
CAUTION: Microwavable packages should be avoided. PET migrates from the packaging into the food, as do the adhesive components (and their degraded products) of the package. |

HDPE=high-density polyethylene
e.g. detergent bottles, milk jugs, water and juice bottles, yogurt and margarine tubs, cereal box liners. Grocery, trash, and retail bags. |
GOOD! Not known to leach any chemicals that are suspected of causing cancer or disrupting hormones.
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V or PVC = polyvinyl chloride
e.g. plastic pipes, outdoor furniture, siding, floor tiles, shower curtains, clamshell packaging, food packaging, children's toys and teethers, tubing, etc. Most cling-wrapped meats, cheeses, and other foods sold in delicatessens or grocery stores are wrapped in PVC. |
AVOID! VERY BAD! Vinyl chloride (the chemical used to make PVC) is a known human carcinogen. To soften brittle Vinyl and make it pliable, manufacturers add “plasticizers” like adipates and phthalates. The additive DEHP (2-ethylhexyl phthalate) is an endocrine disrupter, and suspected carcinogen. Traces of these chemicals can leach out of PVC when in contact with foods. Some polymers may also decompose into the monomers or other toxic substances when heated.
Package components can migrate into wet food, especially if the food contains alcohol, acid, or fat. Skip the boil-in-a-plastic bag foods, as well as avoid those vacuum packed. Plastic tends to migrate into fatty foods, especially hot fatty foods. Don’t leave cheese wrapped in its plastic wrapper sitting in the sun! Cool leftovers before placing in plastic storage containers. Plastic wrap should never come into direct contact with fatty food in the microwave. Use ziploc plastic bags instead, they are not PVC. |
LDPE=low-density polyethylene
e.g. bread and frozen food bags, squeezable bottles, dry-cleaning bags, produce bags, trash can liners, food storage containers. |
OK! Not known to leach any chemicals that are suspected of causing cancer or disrupting hormones.
Not as widely recycled as #1 or #2. |

PP = polypropylene
e.g. bottle caps, drinking straws, yogurt containers. Some ketchup bottles and yogurt and margarine tubs. |
OK! Hazardous during production, but not known to leach any chemicals that are suspected of causing cancer or disrupting hormones.
Not as widely recycled as #1 and #2.
Keep these out of sunlight: they will begin to degrade when exposed to UV light.
It is also important not to use leftover margarine or yogurt tubs in the microwave. Use ceramic or glass cookware instead |
PS = polystyrene
e.g. "packing peanuts", foam cups and plates, meat trays, take-away food clamshell containers, foam insulation and also for hard applications (e.g. cups, tableware, some toys) |
AVOID! VERY BAD! Benzene (material used in production) is a known human carcinogen. A 1988 FDA study of microwavable packaging components, called heat susceptors, showed that low levels of the carcinogen benzene could migrate into food when heated. Butadiene and styrene (the basic building block of the plastic) are also suspected carcinogens. Polystyrene/PS, is a human endocrine disrupter. Also some other compounds leaching from polystyrene food containers have been found to interfere with hormone functions and are suspected human carcinogens. Contributes to the depletion of the ozone layer. Energy intensive and poor recycling. |

OTHER = any plastic other than the named #1–#6(usually polycarbonate)
e.g. certain kinds of food containers, Tupperware, and Nalgene bottles, baby bottles, microwave ovenware, eating utensils, plastic coating for metal cans. |
AVOID! VERY BAD! Made with biphenyl-A, a chemical invented in the 1930s in search for synthetic estrogens. A hormone disrupter. Simulates the action of estrogen when tested in human breast cancer studies. Can leach into food as product ages.
BPA leached from the lining of tin cans, dental sealants and polycarbonate bottles can increase body weight of lab animals' offspring. Even low-level exposure to BPA results in insulin resistance, which can lead to inflammation and heart disease.
PC= Polycarbonate plastics (e.g. Nalgene water bottles) are known to leach the hormone-disrupting chemical bisphenol-A (BPA); BPA baby bottles and baby products are banned in Canada, yet, FDA-US says it's OK if people used it for 50 years.
Used over a prolonged period as an adult or even beginning consumption of these as a child - can actually change and or interfere with the chemical balance in human body. Whenever possible, replace plastic cups and other eating utensils that come into contact with hot fatty foods with glass or metal cups.
Many tin cans (of canned food) have plastic coatings that line the inside of the can out of concern that the metal might contaminate the food. Eighty-five percent of the cans sold in the United States have such linings, and the plastic coating leaches substances into the food, which can disrupt the hormonal system. When you buy the cans there is no way to tell which cans are lined with plastic and which aren’t. Choose frosen vegetables or meats over canned ones.
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