Scientists Debate Bill to Restrict Hormone Disrupting Chemicals in Plastic Baby Products

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Scientists Debate Bill to Restrict Chemicals
Lawmaker seeks to ban compounds in plastic baby products that may pose
health risks.

By Marla Cone
Times Staff Writer

January 11, 2006

Scientists on Tuesday debated the health risks of two chemicals found in
plastic baby products as California legislators consider a bill that would
make the state the only place in the world to restrict one of the compounds,
which has been shown in some studies to mimic female hormones and possibly
interfere with boys' reproductive development.

The bill, by Assemblywoman Wilma Chan (D-Alameda), would prohibit baby toys
and feeding products from containing phthalates, used in the manufacture of
vinyl, and bisphenol A, used in hard, clear polycarbonate plastic for an
array of consumer products, including baby bottles.

No other legislative or regulatory body has restricted use of bisphenol A,
which is considered an essential ingredient of polycarbonate, a light-weight
and shatter-free alternative to glass.

The bill, AB 319, has sparked an intense scientific debate, as well as heavy
lobbying by the plastics industry and environmentalists. If the Assembly
doesn't approve the bill by the end of the month, the legislation will
expire because it was introduced two years ago.

Six scientists, including two sponsored by the plastics industry, testified
Tuesday at a joint hearing of two Assembly committees overseeing health and
environment issues. The purpose of the hearing was for legislators and the
public to hear the evidence about the health risks of the compounds that
would be banned under the bill.

Evidence has been mounting that phthalates and bisphenol A could be altering
the hormones and harming the reproductive systems of babies, but the results
are not considered conclusive, and some studies have been controversial.
While the compounds have been shown in hundreds of laboratory studies to
mimic estrogen or block testosterone and feminize animals, the effects on
humans are largely unknown.

Environmental health activists and some scientists say California should
take a better-safe-than-sorry approach, banning the compounds in teething
toys, bath toys, baby bottles and other children's products because safer
alternatives are available.

But industry scientists and other representatives say California legislators
would be acting with little evidence and would unnecessarily limit
consumers' access to popular products.

"Human exposure is extraordinarily low," said Steve Hentges of the
polycarbonate division of the American Plastics Council. "And there is no
evidence that any human has been harmed by use of these products."

At the hearing on Tuesday, Fred vom Saal, a reproductive biologist at the
University of Missouri-Columbia, said the effects of low doses of bisphenol
A, known as BPA, are clear in animal studies.

"Every aspect of maleness is disrupted," Vom Saal said, including the
animals' sperm counts, prostate size and behavior, because it blocks
testosterone production.

He added that "high exposure of children is occurring and children are more
sensitive than adults."

But Lorenz Rhomberg, a former Harvard and Environmental Protection Agency
scientist who is now a consultant paid by the American Plastics Council,
told the legislators that most studies of bisphenol A have found no effects.
He served on a panel of the Harvard Center for Risks Analysis, funded by the
plastics industry, which concluded in 2004 that the "evidence is very weak"
that the chemical mimics estrogen.

"If you go study by study S you see that in almost every case when there is
a study that found an effect, there are four or more examples of studies
that looked at the same end points and doses and found no effects," he said.

But Vom Saal countered that 140 animal studies have found hormone-altering
effects from low exposure to the plastics chemical. In a published review of
the studies, Vom Saal reported that every one funded by industry showed no
effects while more than 90% of the government-funded studies found effects.

Regarding phthalates, Earl Gray, an EPA scientist who specializes in
hormone-disrupting chemicals, said there is no debate in the scientific
community that phthalates block male hormones, causing feminization of
reproductive tracts in laboratory animals. Thirty to 40 studies on lab
animals show the same thing, he said.

Instead, Gray said, the debate is whether the doses that people are exposed
to can cause the hormonal and genetic damage seen in animals.

Industry scientists agree, saying that the animal studies are conducted with
much higher doses of phthalates than people are actually exposed to.

Several human studies have linked phthalates with changes in sperm, genitals
and hormone production, including one that found baby boys are born with
slight changes of their genitalia.

Dr. Shanna Swan, a scientist at the University of Rochester School of
Medicine and Dentistry who conducted the study of baby boys, said at the
hearing that phthalate exposure is "widespread, silent and involuntary" and
that safer alternatives should be used in children's toys and other
products.

But James Lamb, a former federal government toxicologist who is now a
consultant representing industry groups, said the human studies are new,
small and have many uncertainties.

He told legislators at the hearing that he is "reasonably certain" that the
chemicals in children's products are causing no harm.

As a parent and grandparent, he said he is more worried about children
swallowing items than being exposed to chemicals inside them.

"Let's worry about what matters. Let's not regulate, or especially ban,
every perceived hypothetical risk," he said.

Some phthalates, which are used to make plastic flexible, are banned or
restricted by the European Union and at least 14 other nations, but they are
not regulated in the United States.

The environmental group Environment California reported Tuesday that it
found phthalates in 15 of 18 baby bath books, teething toys and other baby
toys it tested.

Some U.S. toy manufacturers have already stopped using the chemicals after
the EU banned them. But Joan Lawrence of the Toy Industry Assn. said the
chemicals have been safely used in toys and other vinyl products for nearly
50 years and that banning them would mean major changes by all toy
manufacturers.

Toy sales amount to $7 billion in California. The Assembly bill would affect
hundreds of companies and thousands of workers in California alone.

"It sets a dangerous precedent to stop using a product that has a proven
safety record," Lawrence said.

Copyright 2006 Los Angeles Times