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Probiotics protect children and pregnant women against heavy metal poisoning

07.10.2014

Yogurt containing probiotic bacteria successfully protected children and pregnant women against heavy metal exposure in a recent study. Working with funding from the Bill and Melinda Gates Foundation, Canadian and Tanzanian researchers created and distributed a special yogurt containing Lactobacillus rhamnosus bacteria and observed the outcomes against a control group. The work is published this week in mBio, the online open-access journal of the American Society for Microbiology.

A research team from the Canadian Centre for Human Microbiome and Probiotics, led by Dr. Gregor Reid, studied how microbes could protect against environmental health damage in poor parts of the world. Their lab research indicated that L. rhamnosus had a great affinity for binding toxic heavy metals. Working with this knowledge, the team hypothesized that regularly consuming this probiotic strain could prevent metals from being absorbed from the diet.

Working with the Western Heads East organization, Dr. Reid had already established a network of community kitchens in Mwanza, Tanzania to produce a probiotic yogurt for the local population. Mwanza is located on the shores of Lake Victoria, which is known to be polluted with pesticides and toxic metals including mercury.

The team utilized this network to produce and distribute a new type of yogurt containing L. rhamnosus. The special yogurt was distributed to a group of pregnant women and a group of children. The researchers measured the baseline and post-yogurt levels of toxic metals.

The team found a significant protective effect of the probiotic against mercury and arsenic in the pregnant women. This is important as "reduction in these compounds in the mothers could presumably decrease negative developmental effects in their fetus and newborns," according to Dr. Reid. While the results obtained in the children studied showed benefits and lower toxin levels, the sample size and duration of treatment did not allow statistical significance.

The researchers were excited by the potential of basic foodstuffs to provide preventative protection for pregnant women worldwide. They are currently investigating lactobacilli with higher and even more specific mechanisms of sequestering mercury.

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mBio is an open access online journal published by the American Society for Microbiology to make microbiology research broadly accessible. The focus of the journal is on rapid publication of cutting-edge research spanning the entire spectrum of microbiology and related fields. It can be found online at http://mbio.asm.org.

The American Society for Microbiology is the largest single life science society, composed of over 39,000 scientists and health professionals. ASM's mission is to advance the microbiological sciences as a vehicle for understanding life processes and to apply and communicate this knowledge for the improvement of health and environmental and economic well-being worldwide.

Garth Hogan | Eurek Alert!

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