Study finds 500% rise in weedkiller in human urine

A study showing a 500 percent rise in human exposure to glyphosate proves people ingest it when eating Roundup-sprayed crops, the lead researcher says.

The study from San Diego School of Medicine published in the Journal of the American Medical Association this week tested urine samples from 100 randomly selected men and women between 1993 and 2016.

It found levels of glyphosate in urine had increased by about 500 percent over those 23 years.

Glyphosate – the key ingredient in the Roundup, a weedkiller produced by Monsanto – has previously been singled out by the World Health Organisation as possibly causing cancer.

Study author Paul Mills said the increase was directly linked to the introduction of genetically modified “Roundup Ready” glyphosate-tolerant crops in 1994.

He said the urine samples were proof people could ingest glyphosate just by eating some food products.

“Crops are sprayed with Roundup, the crops absorb some of the Roundup, and then when we eat those crops we ingest the Roundup and glyphosate,” he said.

“That’s what we measured in the urine, the glyphosate excretion … it is significant … the levels we’re seeing in people are quite high.”

Prof Mills said the next step would be to see how the levels of glyphosate related to the health of the people who had been tested.

“I am concerned, this is one of the reasons I put together this study because there wasn’t such information in the biomedical literature, and I thought we needed it and we needed to start having some good data to have a conversation around these questions.”

The Environmental Protection Authority (EPA) said in a statement that the authors of the new research stated the concentration of glyphosate was “considerably below any concentration found to have any impact on animals”.

“The EPA is also aware the IARC report from WHO is being questioned because it appears that the draft report was altered substantially before it reached the public; the draft report indicated no link to cancer from glyphosate,” the statement said.

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