Unintended consequences: Arsenic, iron, and your gut bacteria

Francesco_I_de_Medici

Francesco de Medici, a possible victim of arsenic poisoning, may have something in common with the human gut microbiome.  Image via Wikipedia.

Arsenic—the infamous “king of poisons” used by the murderous Borgias—can poison humans and bacteria alike.  But it doesn’t just poison bad bacteria–arsenic hurts the helpful bacteria that make up our gut microbiome, which protects us from E. coli and helps digest our food.  Even worse, the microbiome may be harmed by a common method of mixing iron into water to remove the arsenic.  Chinese researchers reported recently that mice which consumed arsenic-contaminated water with iron had healthier intestines than mice which drank only the water without iron.  However, the healthier mice still had unhealthy microbiomes.  Their gut bacteria had evolved methods for protecting themselves against the toxic metals—methods, unfortunately, which also protected them against antibiotics.  The researchers cautioned that people drinking iron-treated water to avoid arsenic poisoning may develop antibiotic-resistant bacteria, making them vulnerable to dangerous infections.

Advertisements

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out / Change )

Twitter picture

You are commenting using your Twitter account. Log Out / Change )

Facebook photo

You are commenting using your Facebook account. Log Out / Change )

Google+ photo

You are commenting using your Google+ account. Log Out / Change )

Connecting to %s