His findings, published online in Applied and Environmental Biology, shattered a myth started by a 2010 article in the journal Science, claiming the Trogia venenata mushroom contained high concentrations of the metal barium, causing high blood pressure, cardiac arrests and sudden deaths in southwestern China over the past 30 years. The deaths mainly occurred in small villages, some of which saw nearly one-third of their population perish quickly.
Trogia venenata mushroom
“Although there was no published evidence supporting the theory that barium in the T. venenata mushroom was the leading culprit of what was called Sudden Unexplained Death (SUD), it was picked up as a fact by almost all of the major news media,” said Xu, associate professor of biology and a member of the Michael G. DeGroote Institute for Infectious Disease Research at McMaster University. “These reports caused significant concern among the public about potentially high levels of barium in wild edible mushrooms in southwest China.”
Every summer since 2009, Xu and his team have travelled across the Yunnan province, collecting fruiting bodies of T. venenata as well as other mushrooms from villages severely impacted by these deaths.
Researchers tested the mushrooms and found the barium concentration was so low it would require a person weighing 150 pounds to consume at least 35 kg of dried T. venenata for it to be lethal. In fact, the barium concentration in these mushrooms is the same as in common foods, such as fresh meat and poultry.
The majority of SUDs, since 1978 in Yunnan Province, occurred in apparently healthy people, mostly young females, during the rainy season from June to August.
While previous studies suggested certain mushrooms could accumulate heavy metals, there was no information about high levels of barium in wild edible mushrooms. The speculation and subsequent media reports generated significant concern among health officials, the general public and all levels of government and severely impacted the economy by affecting trade of many wild, edible Chinese mushrooms, such as Matsutake, truffles, morels and Chanterelles.
Although Xu’s results show these mushrooms contain low levels of barium, he says barium can’t be ruled out as a contributor to the deaths, given that high levels of barium were found in the blood, urine and hair samples of some of the victims. Yet, his study does suggest that barium in mushrooms was unlikely the leading cause. “Though there are a couple of leads,” he said, “further investigation is needed to discover what the true cause was for these mysterious deaths.”Read Jianping Xu’s study online: http://bit.ly/TR9lVl
Veronica McGuire | Newswise
Some brain tumors may respond to immunotherapy, new study suggests
11.12.2018 | Columbia University Irving Medical Center
Climate change and air pollution damaging health and causing millions of premature deaths
30.11.2018 | International Institute for Applied Systems Analysis (IIASA)
What if, instead of turning up the thermostat, you could warm up with high-tech, flexible patches sewn into your clothes - while significantly reducing your...
A widely used diabetes medication combined with an antihypertensive drug specifically inhibits tumor growth – this was discovered by researchers from the University of Basel’s Biozentrum two years ago. In a follow-up study, recently published in “Cell Reports”, the scientists report that this drug cocktail induces cancer cell death by switching off their energy supply.
The widely used anti-diabetes drug metformin not only reduces blood sugar but also has an anti-cancer effect. However, the metformin dose commonly used in the...
A research team from the University of Zurich has developed a new drone that can retract its propeller arms in flight and make itself small to fit through narrow gaps and holes. This is particularly useful when searching for victims of natural disasters.
Inspecting a damaged building after an earthquake or during a fire is exactly the kind of job that human rescuers would like drones to do for them. A flying...
Over the last decade, there has been much excitement about the discovery, recognised by the Nobel Prize in Physics only two years ago, that there are two types...
What if a sensor sensing a thing could be part of the thing itself? Rice University engineers believe they have a two-dimensional solution to do just that.
Rice engineers led by materials scientists Pulickel Ajayan and Jun Lou have developed a method to make atom-flat sensors that seamlessly integrate with devices...
12.12.2018 | Event News
10.12.2018 | Event News
06.12.2018 | Event News
13.12.2018 | Life Sciences
13.12.2018 | Physics and Astronomy
13.12.2018 | Earth Sciences