Until only a few years ago, medical science taught doctors that the three to five pounds of bacteria that are housed in our digestive system played a limited role in our well-being. As the former dean of Harvard medical school, Sydney Burwell once said, "Half of what you are taught in medical school will be wrong in 10 years' time." What we have come to learn about the gut microbiome in just the past five years has revolutionized our understanding of the role of the digestive tract in body physiology, health, and disease outcomes. The microflora in your gut outnumber your own human cells by a factor of 10 to 1, and microbial DNA outnumbers your human DNA by 100 to 1. The gut flora has been...
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