By Ingrid van Heerden

When it comes to the truth about genetically modified foods, it's difficult
to know what to believe.
The information for the article has been sourced from a report based on a
publication released by the New Zealand Royal Commission on genetic
modification. This report was the result of 14 months of consultation with
proponents and opponents of GM.

The Commission functioned as an independent review panel created to report
to the New Zealand government on the options available to deal with GM. This
report represents the first of its kind in the world.

Among many other aspects, the Commission examined some of the most popular
myths relating to GM and investigated the actual facts:

Myth: "GM potatoes had toxic effects on rats that may also affect humans"
Dr Arpad Pusztai, a senior scientist at the Rowett Institute in Aberdeen,
Scotland caused consternation when he announced to the media that rats
eating GM potatoes suffered from depressed immunity and experienced changes
in the structural lining of their intestinal tracts.

Investigation showed that the rats in the trial conducted by Dr Pusztai had
been fed raw potatoes. Since rats don't like to eat raw potato, they stopped
eating and the trial had to be abandoned after 67 days because the rats were
starving.

Starvation is known to alter the intestinal lining and both the rats fed raw
GM potatoes and those fed raw standard potatoes had similar changes in their
intestines. The Commission also pointed out that other potato toxins found
in raw potatoes could have caused the changes. In addition, the tests that
Dr Pusztai had used to test immunity in the rats were not standard, accepted
tests.

The Commission concluded that, "Within the scientific community there is
general agreement that the results of Dr Pusztai's experiment are
inconclusive insofar as there were flaws in the process and the project was
incomplete. Extensive testing carried out by Chinese researchers, similar to
that described by Dr Pusztai and Ewen, has not replicated their results."

Myth: "L-tryptophan produced from GM bacteria caused death of humans in the
US"
In the 1980s, L-tryptophan, an amino acid that is found in proteins, became
a popular treatment for insomnia and depression. This amino acid is usually
produced with tryptophan-producing bacteria via fermentation. The bacteria
used for such fermentations can either be standard bacteria or GM bacteria.

In 1989, individuals using L-tryptophan in high doses started to develop
eosinophilia-myalgia syndrome (EMS), a new illness associated with painful,
swollen muscles, rashes, digestive problems and increased white blood cell
counts. Thirty-seven people died in the USA, 1500 were disabled and about
5000 were affected.

Intensive investigation found that the Showa Denko company, which produced
the L-tryptophan that caused these harmful effects, were using GM bacteria
for their fermentation process. However, of greater importance is the fact
that this company had started using a different purification process that
utilised less charcoal than normal to clean the L-tryptophan.

When the L-tryptophan produced by the Showa Denko company was analysed, 60
contaminants were identified, of which six were responsible for causing EMS.
These six toxins were identified as the agents that caused EMS and their
presence in the L-tryptophan was due to an inefficient purification process,
not the use of GM bacteria in the fermentation process.

The Commission concluded, "The United States courts decided that the
manufacturing process rather than genetic modification was at fault".

Other tryptophan products were available on the market that had been
produced by GM bacteria and these did not cause any health problems.

Myth: "The increase in phyto-oestrogen levels in herbicide-tolerant soybeans
can cause breast cancer"
In Switzerland, the Basle Appeal Against Genetic Engineering published a
letter in February 1997 in which they stated, "We fear that the Roundup
Ready soybean produces large quantities of pseudo-oestrogens when it is
sprayed with Roundup herbicide. Today, it is assumed that oestrogen hormones
play an important role in the emergence of breast cancer."

It is a well-known fact that soya beans contain compounds called
phyto-oestrogens and that these compounds can have both positive and
negative effects on human health.

Investigations found that the study the Swiss anti-GM group were basing
their evidence on had been carried out in 1988 ? at which time the Roundup
Ready soybeans did not exist!

The Commission concluded, "Some plant-protection agents contain
pseudo-oestrogens although Roundup herbicide, by contrast, contains none at
all. This fact has been confirmed by the Freiburg Ecological Institute."

Myth: "Bt corn threatens the existence of Monarch butterfly populations"
GM has been used to produce Bt-corn (maize), which is toxic to corn borer,
an insect pest that is a member of the Lepidoptera family. Moths and
butterflies, such as the Monarch, are also members of the Lepidoptera family
and Bt-corn strains are thus also toxic to these insects.

The larvae of Monarch butterflies feed exclusively on the leaves of milkweed
plants, which are commonly found in and around cornfields. Pollen from
nearby corn can theoretically be blown onto the leaves of the milkweed and
eaten by the Monarch larvae.

Because there has been a decline in the Monarch populations in recent years,
the GM corn crop was blamed.

Intensive investigations showed that there is no overlap in the breeding
time of the butterfly and the time when pollen is shed by the corn. In
addition, it was found that any Bt effect was restricted to an area of 5
metres surrounding the cornfields and that this occurred very rarely.

The Commission deduced that, "These findings indicate that, outside
cornfields, Monarch larvae exposure to Bt-corn pollen is minimal, and that,
within fields, Monarchs will have a low probability of encountering a toxic
level of pollen. The report also suggests that the elimination of pesticides
through the use of Bt-corn can be beneficial to Monarch butterfly
populations, and concludes that there is not sufficient evidence to support
the belief that there is significant risk to Monarch butterflies from
Bt-corn use."

These examples of GM myths, and the actual scientific facts that disprove
the myths, are just a small sample of the many instances in which the media
or the anti-GM lobby have instigated scare stories to frighten the public
and discredit GM foods.

There are many other examples, but if the Royal Commission of New Zealand
were able to conclude that these ideas and stories are myths and not facts,
then it should help the public to view GM food scare stories in a sensible
light.

www.checkbiotech.org