World’s Largest Study on the Human Gut Reveals Connection to These Mental Health Problems

The 2012 American Gut Project was conducted with the aim to discover more about the human microbiome, more commonly referred to as ‘the gut’.

Rob Knight, Ph.D., from the University of California (UC), San Diego, Jeff Leach, Ph.D., the founder of the Human Food Project, and Jack Gilbert, Ph.D., who is the faculty director of the Microbiome Center at the University of Chicago in Illinois, set out to discover the possible links between bacteria in the gut and various health issues. They also wanted to find out how many types of bacteria live in our bodies and where, and how our diet and lifestyle affect the composition of these microbes.

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The microbiome is a complex world of different bacteria kinds that live within our digestive system, and while some of them are beneficial, some are not, but they all form a microscopic world of activity that can support or fight disease.

Scientists analyzed fecal samples sent from people all around the world, along with their oral and skin samples of bacteria, and asked numerous questions about the lifestyle and diet of these people.

This practice is known as citizen science, so the public contributes to research by offering their time and personal data up for analysis. In 2015, they received 15,096 samples by 11,336 people across the United States, United Kingdom, Australia, and 42 other countries.

The team of scientists used genomic sequencing to analyze a genetic marker known as 16S rRNA, a molecule unique to bacteria.

First of all, researchers found that people who consume a wider variety of plants have a wider variety of bacteria in their microbiome, and have less antibiotic resistance.

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