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In the 1990s, scientist Ivan Casas traveled to the Peruvian Andes in search of human microbes. Casas was head of research for a Swedish probiotics company called BioGaia. He believed that mammals, including people, passed beneficial microbes to their young via breast milk. But he’d been unable to isolate one species he thought should be there (Lactobacillus reuteri) in breast milk from women in the US or urban areas

I have a piece in the NYT Sunday Review exploring the question: Should we bank our own stool for microbial reconstitution? A few notes and interesting tidbits that didn’t make it into the piece. First, an interesting study linking early-life microbial disturbances with the later development of asthma was just published in Science Translational Medicine. Unlike other studies, which look backward in time to make

Although professionals may bemoan their long work hours and high-pressure careers, really, there’s stress, and then there’s Stress with a capital “S.” The former can be considered a manageable if unpleasant part of life; in the right amount, it may even strengthen one’s mettle. The latter kills. What’s the difference? Scientists have settled on an oddly subjective explanation: the more helpless one feels when facing

A few years before Super Size Me hit theaters in 2004, Dr. Paresh Dandona, a diabetes specialist in Buffalo, New York, set out to measure the body’s response to McDonald’s—specifically breakfast. Over several mornings, he fed nine normal-weight volunteers an egg sandwich with cheese and ham, a sausage muffin sandwich, and two hash brown patties. Dandona is a professor at the State University of New York-B