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Glyphosate herbicide is sprayed on, and accumulated by, most
GM crops. Despite the fact that it's
always used in formulations such as 'Roundup', "There is an unexpressed,
widely believed assumption that the active principle against plant metabolism
(glyphosate) is the most toxic compound of glyphosate-based herbicide
formulations on non-target species." (Mesnage et al.)
These 'non-target species' include wildlife, livestock, pets
and humans.
How valid is this 'widely believed' assumption?
Chemical glyphosate constitutes a minority ingredient in formulations (at most, less than 50% even in pre-diluted form, and sometimes no more than a few percent of the total). Although the non-glyphosate constituents are referred to as 'inerts', they are put there to make the herbicide kill better.
While glyphosate itself specifically targets plant
metabolism, the 'inerts' are not so fussy.
Most ubiquitous of the 'inerts' are 'poly-ethoxylated
alkyamines' (POEA) which are needed to help glyphosate penetrate the barrier of
the outer cell membrane. In tests, POEA
on its own proved to be 10,000 times more toxic to isolated cells than
glyphosate.
Most other 'inert' ingredients are a trade secret and,
therefore untested and untestable. As
weeds have become increasingly resistant to older Roundup formulae, more
aggressive forms have come on the market: these contain the same old glyphosate
combined with ever more aggressive 'inerts'.
Chemical glyphosate, as used in scientific experiments, has
been found to contain a number of contaminants, including significant
quantities of glyphosate's major derivative (AMPA), 1.5% formic acid (a.k.a.
ant poison), and 2.85% formaldehyde (a.k.a. embalming fluid). All are toxic and were found at toxic
levels. Some are carcinogens.
Chemical POEA has been found to be contaminated by dioxane,
a carcinogen.
While POEA is added to Roundup to aid glyphosate
penetration, it can give other environmental toxins a helping-hand into
your crops, and therefore into your food, and into you too.
Also, POEA survives longer in the environment than
glyphosate, which means it has more time to cause mischief.
Standard safety-testing of glyphosate involves
feeding-studies using laboratory rats on a diet of standard rodent chow. Laboratory rat feed has recently been found
to be contaminated with variable quantities of GMOs, pesticides, heavy metals,
PCBs, dioxins ... and glyphosate [1].
Regulatory tests to establish 'safe' levels of glyphosate
intake have been bugged by inconsistency.
This is hardly surprising when you consider the scope for spurious
toxins in 'standard' test and control feeds. Yet, the variability of toxic
effects seems to have been used as a reason to ignore inconvenient
findings.
At the end of the day, we need to know that what we are
eating is safe no matter what contaminants or what combination of contaminants
are present. As the authors of a new
review of the potential toxic effects of glyphosate and its commercial
formulation stressed, a complete and more realistic reassessment of glyphosate
is clearly called for.
OUR COMMENT
We need to get rid of industry secrecy, get rid of all notions
of 'inert' ingredients which are anything but, and pay a lot more scientific
attention to the scientific quality of the materials used in supposed
scientific safety tests.
Background
[1] POISONED LAB-RATS ARE NORMAL - August 2015
SOURCE:
R. Mesnage, et al., 2015, Potential toxic effects of glyphosate and its commercial formulations below regulatory limits, Food and Chemical Toxicology
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